holley sniper starts and dies

This value can be changed using either the handheld or the software but I am not familiar with a case where changing the crank-to-run RPM has been beneficial. First, there is the obvious--the system has to learn. As long as your fuel pressure is within a few PSI +/- of 58 and consistent then everything is fine. 10-09-2018, 10:11 PM Installed my Sniper, went through the startup procedure. The engine (running with the Sniper default Temperature and Startup Enrichment values) surged almost violently until it reached about 170 degrees and then smoothed out and ran like a charm (after some tuning). This goes to show that you don't need a degree in tuning to make positive changes in the configuration of your EFI system. Bolt-on carburetor style EFI for your classic car or truck. Try cranking immediately upon key-on--before it has a chance to prime. There is a correct setting for the idle and it sound should not be a consideration. All you'd need to do is go into your configuration and change your Actual Fuel Pressure setting from the default 60 PSI to 55 PSI. Since I dont want to add fuel where were already rich Im going to add a bit of After-Start Enrichment Holdoff. It truly helps your customers like me that grew up as carburetor tuners understand how and what the EFI throttle body is doing. Yes, there should be a steady flow of fuel out of the return. That's a spread of 200 degrees so half of that would be 100 degrees. Do you see an issue with this? Regardless, this screw will eventually need to be adjusted. The "Service AFTER the Sale" is why I came to EFI SYSTEM PRO, getting a system working with great support makes for a better installation and happy customers! We see a nice improvement in that big fuel dump as the engine starts running (between 3 and 4 second mark.) Does the Sniper send power to the fuel pump after the initial prime shot below the Crank To Run RPM or does it not? I have it disconnected to flush any debris out.Thank you. features . Good luck! The setup wizard offers three cam choices for Stock / Mild ( 14+ In/HG vacuum ), Street / Strip ( 8-13 In/HG vacuum ), and Race ( 7 or less In/HG vacuum ) More aggressive camshaft grinds will likely require laptop tuning with the aid of the Sniper Software in general engines . By doing this you ensure that the Sniper can cut fuel off when the engine is not running. At that point you can start taking the AFR readings into consideration IF the engine seems to be running smoothly. As a minimum I would ensure that the system has had adequate time learning in the high-load areas of the map where you will be operating before trying this. I have a datalog. That's what the fuel prime is all about. 4-hole spacers seem to work better than open spacers. I see recommended plugs are resistor type. Price Point: $$$. I strongly recommend EFI System Pro. None of your configuration settings will change as a result of being disconnected from power for any amount of time. Do I still need the holley 12-753 30 amp relay. For this I recommend the HyperSpark Distributor. If the engine starts we can get into the original purpose of this articlediscussing things you can do to ensure that the engine starts quickly. Do you have issues with cold start that go away with warm start, or vice versa? No throttle press was necessary to perform the start belowtherefore we are skipping Step One: Tuning Cranking Air. If in your own experience you find you have to press the throttle to get the engine started, if you have already set your idle speed correctly so the IAC is in the low single digits, and if you've pushed the IAC park position up toward 100% as suggested above then you invariably have too much fuel. But with patience you will get there. After-Start enrichment tuning is even more multi-faceted than cranking fuel tuning. This is a value that you dont have to nail the first time you try it. #2 I have a return 1/4 pipe coming out of the fuel pump at the fuel tank. Getting the engine running was never a problem. I've gone through all the steps and cannot seem to solve the problem. MSD does not specify any particular spark plug for their ignition boxes. You are on the right track!Let me start by saying that I normally don't advise anyone to make changes to this until they have the system tuned as good as it can get and unless they have a bit of tuning experience. And the less correction you do until you understand that---the better! Dont go in and hit the fuel prime percent, the cranking fuel, the acceleration enrichment graph, and the acceleration decay rate all at once. Is a tremendous volume of fuel sprayed into just one barrel? I strongly recommend EFI System Pro. You see that the AFR trace is ar below the target AFR (pink trace.) If you don't show any fuel pressure then fix that. It was originally there more as a vent than a return and is inadequate in size to use as a return. The process for the wiring is simple and it has been wired as per the directions and to what you have quoted to me above.In order for me to return the Sniper, what would the process be? Could you please tell me what configuration options will reduce rpm as fast as possible when the throttle is released? Not some generic pump as some have speculated. Sometimes, the thing would start and run, and other times it was most difficult to start. Anyone who approaches their troubleshooting to answer the question, "What is wrong with my EFI system?" Ran well on carb and electronic ignition. Good point. Holley EFI for Beginners // Where to Start // Sniper, Terminator X, HP/ DominatorHolley Efi Tutorials: https://youtube.com/playlist?list=PLN6EQoVPwAwHzmhEknk. Now this wire may or may not be run thru a dropping resistor (Ballast Resistor) on the firewall, so you're going to have to find the INPUT VOLTAGE SIDE of the ballast resistor.Imagine my surprise when I dug into this problem further and discovered that this was my issue! I have purchased two sniper EFI with the MSD distributor kit. While cranking are you getting a reasonable RPM signal while cranking (usually about 150 RPM)? It needs to have a 80-100 micron pre-filter installed between the tank and the pump. I look forward to your opinion on this matter. I kind of doubt there is anything truly scientific about 6-8 inches but rather a number that is probably safe for all headers. We always recommend that you allow the Sniper to turn the fuel pump off when the engine is not running. Not bad but maybe we can improve that. Hi, I have a 1987 Firebird with 305 engine and Quadrajet carb. Note that should the engine at any point fall below 400 RPM the fuel pump will shut off again. A key at the top of each log shows the signals associated with each color. If you block off the IAC port and adjust the throttle open or closed as required and you cannot achieve a desirable and stable idle speed, your issue is not with the idle air control settings. Price Point: $$, Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. Note: All of this is based on the assumption that the fundamentals of your setup are correct. :-), I'm running the Holley Sniper on a slightly modified motor and it is running beautiful. Bill Tichenor. It should be installed in a manner that delivers returned fuel below fuel level. 4.56 rear gear and total weight is 2825 with me. Is a tremendous volume of fuel sprayed in all barrels? Does it smell rich? you will observe that they are almost IDENTICAL when it comes to AFR. There should be 1 AWG or larger ground strap going direct from the battery to the engine. You need a new fuel pump. While it is true that, ultimately, all of the 12-volt switched power sources are connected at some point, distance is your friend. Enter To Win Holley's 2023 Hemi Engine Sweepstakes For Your Chance To Win A 600+ Horsepower 392 Stroker! Pinched or Burnt O2 sensor Wiring: Keep it high, tight, and safe. Can I get ready made tunes?Even with this problem it is by far the best fuel system I have owned. This circuit shuts off during crank and will obviously cause problems. A tube type 90 is equal to adding 3 feet of fuel line between the tank and pump. Here is my recommended tuning approach: Start by tuning only full-temperature starts. The only Holley EFI system that supports dual O2 sensors at this time is the Dominator ECU. Don't be that guy. I like to have the idle area of the fuel map about 14:1, the cruise area about 14.5:1 and the WOT area about 13:1. Default values on these are 150% and 5, respectively. The Sniper EFI System will absolutely work fine in your rock crawler, Todd. Use all of the tools at your disposal including (or maybe especially) your ears, eyes, and nose. If you turn the ignition off and back on, & crank it, it will start & die again. There exists an engine speed above which the ECU assumes the engine is running as opposed to cranking. Does it recover if you bump the throttle? I hope to do more articles similar to this so stay tuned! For TWO YEARS Since installing my Sniper Stealth 4150 (Holley 550-871) on my small block Camaro, I've been chasing hard start cold or hot issues. Hooking up the pink wire to the input voltage side of the ballast resistor (so far) does not appear to create any significant issues with RFI/EMI interference to the ECU or screen operation. Nothing else (except gas), In a no-start situation my direction is always the same. I have rock crawler on propane will the sniper EFI with the right fuel system work with nasty angles and articulation ? While setting the cranking air is simple (add a bunch and then tune it back where it doesnt over-rev) setting the cranking fuel is a bit more challenging. That amount of air is determined by the IAC Park Position. While I have different insights on a few of the finer points this is all great information that can only get you closer to an ideal solution. Have you ever watched a post nuclear apocalypse movie? Love the example at the end. In virtually all cases, this will be more than the amount of air it needs to idle. Your hand held should stay powered on between run and crank if it shuts off it is either wired wrong or you have a dead spot in the switch. Beyond that you're going to have to get Holley tech support involved. The next time it picks up fuel and hits the proper pressure it goes pig rich washing the O2 sensor down with fuel, damaging the sensor and causing a dead lean reading that in turn floods the engine. what is the proper air/fuel ratio for a sniper on a ford fe 352? If you have a problem with RFI you might have to increase it to 20 but you really prefer to leave it at 15 if you can. The challenge will be what you call the "right fuel system". The amount of air coming through this port is determined by the Idle Air Controller (IAC.) Nice catch, Ken! Avoid using any 90 degree fittings between the tank and pump. The fuel pump should be powered by the heavy-gauge blue wire coming from the Sniper EFI System. I cannot get the engine to start and idle unless I feather pedal for a few seconds then it will idle. Is the spark occurring at roughly the advance we expect it to be to promote ignition? Free ground shipping regardless of order size! You need to run resistor plugs and resistor, non-solid core wires. (You DO have a fuel pressure gauge installed, right? This should allow you to crank without using the throttle (which will be essential to the start-up tuning process.). Hey Chris, I installed a Holley sniper on a small block 400, first start was great! I have two questions at this time: 1. Price Point: $$, Robust, feature-rich Are you running timing control? Figure out what it's not getting and the find out why. I have a 88 f150 302 with factory efi and dual tanks. Too much and it will simply idle high and can be manually adjusted down. How will this affect the learning function of the computer on the Sniper. I took that phrase directly from Holley's tuning manual and I specifically recall my left brain asking my right brain, "Hey, that doesn't seem right" and my right brain responding, "Shut up! Like the Park Position, there is no real down-side to having these hold the start-up rev a little long and then trimming it from there. Everyone else was backordered several months. You can find that here. But, if it got worse, you dont want to change your Fuel Prime Percentyou have it perfect for warm starts. It is an internal combustion engine. Exactly. Many of these are completely normal with EFI. Continues rich and then goes a bit lean. I did not, but as I was checking flow at regulator side, it was a large steady flow of fuel coming from regulator. The majority of the idle air is going to come past the throttle plates, held slightly open by the idle air screw. Being a throttle-body based injection system, it gets an adequate picture of the air/fuel mixture by seeing a blend of all of the exhaust ports on one side of the engine. Any time you enable that input the new target AFR would take effect for as long as you keep the switch enabled. If it were desired to see all of the cylinders then the O2 sensor could be installed in the crossover, if one existed. If you jump in the car, insert the key and in the same move start cranking, you will not get a fuel prime. Fires up & runs perfect. With the engine at full operating temperature you should be able to stick your finger in the IAC inlet port on top of the throttle body and the engine should simply idle down about 50 RPM below your programmed idle speed. Can you post a photo of the wiring on the ignition switch? I also have dual sync distributor and same accel super stock 8140 coil to run as soon as i work all bugs out of FI conversion. Good luck! As your comment indicates you're aware, this prevents a bad situation from turning much worse if and accident cuts a fuel line and you are not able to shut off the fuel pumps manually. You can run resistor or non resistor plugs with the 6AL box. Compression, properly metered fuel, correctly timed spark. Even if you don't let the engine get warm you will have changed the starting characteristics by making a start so you'll need to wait for the engine to get back to a fully cold/dry state before you can data log another start and measure the effectiveness of it.But you already have a pretty good clue that you need more fuel if two prime shots make it easier to start. offer easy plug-and-play We can adjust that with the after-Start enrichmentIll bump that up a bit. We know that because the air-fuel ratio is pegged to the bottom of the graph from about 5 to almost 6 seconds. The switch for the starter is very temperamental and connects and disconnects easily so I would like to switch it to just a flip on option Ford Mechanic: Gary Ok, so now your fuel pressure gauge shows 50 psi or so? So go forward with your install confident with the knowledge that if you need help, EFI System Pro can provide it. If your O2 sensor is pegged lean, then replace it. Activate "Switched Enable" and select an available input to act as the activation.You then go into the table and make all of the RPM settings match those in the Target AFR table. Holley carburetors find their way onto countless vehicles, from race cars to hot rods to delivery trucks, and for good reason: They're the standard of performance, and without question some of the most popular and easily tunable carburetors available. But never ever forget there is a second learning going on--your own. Therefore what remote TPS can be used? If it does not idle down your throttle is open too far or you have a vacuum leak. Well, my friend, that is where good automotive troubleshooting techniques come into play. Full product line and accessories at excellent pricing. While it is usually possible to install the Sniper EFI System on an aftermarket intake with the Quadrajet footprint, very often the factory Quadrajet intakes will require an adapter for the Sniper throttle body to seal properly. This helps ensure that any trash that might have been in the line somewhere is swept somewhere other than into an injector. Great job implementing what I've written! :-), Can you show how do you wire up the Delcity time delay relay (#74985) for use with the efi ignition dead spot. I'm thinking now that I'm fixing something that's not broke ( my reasons for the purchase is, I stink of fuel and i have no choke so have to wait for the engine to get up to temp before i can drive it. You also need to properly phase the rotor. Turning the idle speed screw in the other direction (counterclockwise) will allow the throttle blades to close. FE 390 that currently has a Pertronix distributor with the Ignitor 2 module. Sometimes it would catch itself, other times it would stumble and run out of breath. Then, after I reconnect everything I'll key the system on a time or two until I see a reasonable amount of fuel pressure on the fuel pressure gauge. I figured it would be minimal. Thanks. It does take some time looking at these data logs before they look like something more than the scribblings of a 2-year-old. I have an '89 Jeep 4.2L with a Sniper 2300 2BBL on it. This Mr. Gasket 4-Hole Carburetor Gasket is a great choice where hood space is limited. Set the table type to Air/Fuel Ratio Offset4. It will add fuel based on the temperature and won't affect your warm start.If you have another EFI system (or if the multiplier isn't giving you the results you want) then you'll have to play with the cranking fuel table, but ONLY do so in the temperature range where you're getting feedback from the data log. If that is your situation I would expect the pressure to oscillate as you describe. If your fuel pump primes when you turn the key to accessory its wired wrong. There is really no room for error on this. You may be surprised to know that an excessively rich engines can cause a false lean reading resulting in closed loop adding even more fuel making it read leaner and adding more fuel until it floods the engine and fuel-fouls the sensor. Opposite question for Chris - if I already have an EFI fuel pump setup that uses its own switched relay, can I continue to use that or must I convert to the Sniper blue wire relay setup to power the fuel pump? *Possible delays due to Covid-19 click for more information. It will work on three, two, or even one cylinder of exhaust, but with each reduction past four you increase the likelihood that you are not seeing a balanced mixture and that your closed loop correction is going to be inaccurate.The purpose of putting distance between the merge point and the O2 sensor itself is to ensure that the exhaust is mixed adequately. Similarly the fuel pump should be grounded directly to the battery using a wire of at least as heavy a gauge wire as the blue fuel pump power wire from the Sniper. I have just finished installing my Holley Sniper to my 67 Camaro. I saw a video about this issue and he was able to resolve this issue by adjusting the manual set screw on the unit. Not some generic piece as some have speculated. Incorrect connections will result in excessive resistance. Not much I can add to that. Ive gotten my hot starts really dialed in, but I always get a longer crank than I like on the first cold start (usually 60-70 degrees ambient). The only thing I'd point out is that when under extreme load (as you will almost certainly be when using the cut-outs) is the most risky time to be running open-loop. Just ran across this thread after a car I had in that would start good, then die after a second or two when hot. Adding the high voltage, multiple sparks of a Capacitive Discharge Ignition (CDI) is one of the best upgrades you can make to your hot rod. Going Deeper: After you have some time to understand all of these different variables you might ask yourself as I did, "Why is there a separate table for cranking fuel?" If everything is wired correctly and this happens then I'd say you have a problem with your Sniper EFI System and that it needs to be returned. Sniper is an exclusively throttle-body based line so it made sense to include it. Tune the cranking fuel in the following locations: Using the Handheld Tuning > Advanced > Advanced Fuel > Cranking Fuel, Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > Cranking Fuel. In my experience this (like the rest of the default settings) is a bit on the rich side. "Wouldn't the prime shot be half (2.5x) at 60 degrees and not 40 degrees? ), I have the sniper efi system with the holley retro-fit in tank electric fuel pump. Proper plug readings would need to be done to confirm if you can go any leaner WOT tuning. Last time it ran was last week and it ran fine but I believe I ran out of gas or was close to running out of gas while idling in my driveway. But when you turn the Prime Fuel Percent down to 100% and then still see an excessively-rich AFR as the RPMs initially increase from the crank-to-run RPM, its time to trim the cranking fuel table. If you have any exhaust leaks between the combustion chamber and 18-24 after the sensor you are going to have problems. Anything else would be a big safety no-no. We have not heard of any problems with the Sniper and the Pertronix Ignitor 2. Whats the fix? Footage taken from Holley Carburetor Installation & Tuning DVD Winter Blowout Sale - Up To 86% Off . Hi Chris,Thank you so much for your quick response to my query. Find a lower price anywhere and we'll beat it by 5%! All of these values are configurable. Much appreciated! :-D. Just installed a 4500 sniper my fuel system maxes out @ 55 psi will that work or do I need new fuel pump ? 2.) Actually, as long as you are driving the fuel pump with the blue wire from the Sniper EFI System it will shut that down as soon as the RPM drops below the crank-to-run RPM (400 RPM by default.) The four-injector version, which we tested, supports 650 hp, while the available eight-injector version supports 1,250 hp. Get a gauge. Disable the tach sweep on your ignition box. Read the instructions and Follow them. Resistance results in heat and heat results in more resistance. Yes, ensure the Sniper EFI switched +12V pink wire is powered in the "Run". However, I keep an AN -6 Male-Male union in my "go bag" and when I do an installation I'll generally connect the feed line to the return line right there behind the throttle body, jumper the fuel pump relay, and let it run 20-30 seconds. Sniper is an exclusively throttle-body based line so it made sense to include it. Looking at the 4500 sniper and I run Super Street 10.90. For the Sniper it is best to run resistor plugs. Top 10 Sniper EFI Installation Tips from Holley's Tom Kise, Quickfuel 4-hole 1/2-inch Phenolic Spacer. Where do I start looking for the solution? Ill check the coil and see if anything else is attached. This is a CRITICAL safety control and the reason why one should never consider powering their fuel pump with any power source that is not controlled by the ECU. But I strongly suspect that is not the case. How did you install the return line to the tank? Once engine is warmed up been driving for awhile. Starts & immediately dies. Clicking, ticking and sucking sounds. The way you write makes it so easy to understand. Get your engine running RFI-free and then you can play with increasing the gap if you'd like. Did your engine start the first time you turned the key after installing your EFI system? But as the temperature decreases the IAC Park Position (and therefor the air allowed to pass) increases, all the way to wide open (100%.). 2023 HOLLEY PERFORMANCE PRODUCTS, INC. ALL RIGHTS RESERVED. You just have to go one direction and see if things improve or not. If it cranks better then you know you're getting too much fuel. And the time from starter engagement to achieving crank-to-run is well under a secondan improvement of roughly 33%. If you're installing a Sniper EFI system and almost ready to crank it over for the first time, this is the video for you! A low air to fuel ratio means the mixture is rich. Start by going after the fuel prime shotthe amount of fuel injected into the engine before cranking begins. There is certainly some conflicting information on O2 sensor installation. Is that an expectable by-product of adding this relay? Does the sniper kit support dual O2 sensors? Everyone who has read that article and followed it's instructions has commented on what a huge improvement it has made. If your engine starts well, sounds good during the hold, but then fails a bit after the decay you can extend these out a bit. Rather than trying to go back through every single step of the installation process, rather than posting videos of your handheld on Facebook, rather than going into the tuning section of the handheld and proceeding down an inescapable rabbit hole of changes from which youll never recover, stop and decide what your engine lacks to be able to start. Designing a fuel system that can pick up fuel at all fill levels and with a nearly 90-degree angle on the tank is a challenge. The default for these systems is 400 RPM. Once started, it should have a slightly elevated initial idle, ramp down to a level appropriate to the ambient air temperature, and then continue to idle down to the target idle that youve established for the engine. Chevy 350, rocker cam, mild cam. Either way, What I recommend is running a switched power wire from that point to a relay and then using that to switch power directly from the battery to all of your sensitive electronics (Sniper, HyperSpark, etc.). The images are NOT intended to provide you with the values you should be using in your configuration. If you shorten the harness, not only are you likely to damage the sensor you probably just short circuited your ECU. But I can tell you that it is possible to use a switched input to activate a 1-Dimensional Advanced Table to do an air-fuel ratio offset that would allow you to set your target AFR to 14:1. He gave no details, is this an option and how would one go about this. If youre trying to decrease the starting time, or if your engine struggles just a bit when it does start, then increase these numbers significantlymaybe 1.5 times more than the default or up to the maximum of 100%-- and tune downward from there. Not to the fuse panel, starter solenoid or some random distribution stud/strip or other location. :-). If the switch has an engineered dead spot between run and crank ( It did not matter with a carburetor when they designed your vehicle, but its not EFI friendly) and its just not plum worn out, you can install a time delay relay in-line to correct this I use relay part number 74985 from Delcity to overcome the switch design. Don't change the prime shot percentage though. (Ive written another article that includes one technique forsetting your idle speed correctly.) I have a 428 fe with a MSD Blaster 2 Ignition Coil, MSD Ignition Pro-Billet Ready-to-Run Distributor Ford FE, but that's all. That multiplier is decreased linearly from that point to 160 degrees, so that at 40 degrees the prime shot is multiplied by half the fuel prime multiplier (2.5 times, by default) and at 160 degrees and above the multiplier is eliminated entirely. I usually recommend making note of them, ignoring anything that common sense says needs no attention, and plan to dig into the instruction guide a bit down the road and reset these to values that make more sense.Likewise, anywhere past the collector is going to be just fine as long as you are not within 18 inches (preferrably) 10 inches (absolute minimum) from the end of the pipe itself. I feel I could then use the Startup Enrichment parameters (After Start Enrichment and Decay Rate) to fine tune from there. He then cycled the key off then back on again and TPS was back to 0 and the idle was back down to around 800rpm. Holley Sniper EFI Check Latest Price. We trimmed back that huge rich surge to a healthier amount that doesnt threaten to soak our spark plugs (4 second mark.) There should be no relay added to this wire. MAIN POWER AND GROUND need to go to the battery. If you . In a nutshell, you do the following:1. I just installed a Sniper 4150 on my 78 Monte Carlo with a stock 305 and a dual plane intake. And 10 micron filter between the pump and throttle body. Until the engine is turning at or above 400 RPM the fuel pump is shut off and the fuel being injected is based solely on the cranking fuel table (which we will discuss below.) Do you have fuel pressure? Any tips or info on cold starts? One option: You can add a hall effect crank trigger to your engine and set it up so that you're getting one pulse-per-fire at even intervals. This is extremely unreliable afrer warm. :-). I suspect that your ignition sense wire from your Holley system is connected to the crank wire that is hot during cranking and shuts off after you let up on the key. superchargeddrt Well-Known Member Joined Aug 24, 2009 Messages 2,420 Reaction score 1,102 These are listed on the handheld in the same window as the IAC Parked position (as described above.) Cheers Darren. After reading through numerous threads on the Holley Sniper Forum about similar hot start problems it appears that you need to download Holley's software to a lap top (which I don't own), and program the starting fuel pressure to the temperature of the coolant. Did you hear the fuel pump run at key-on? Yes, I have fuel pressure. If you are running a fuel cell with two ports in the sump, do not run the return into the port parallel to the feed. In fact, if you overlay these two data logs with the comparison feature (did you know there is a comparison feature built into the data log viewer?) Https: //youtube.com/playlist? list=PLN6EQoVPwAwHzmhEknk below fuel level port is determined by the and! Try cranking immediately upon key-on -- before it has a Pertronix distributor with msd..., which we tested, supports 650 hp, while the available eight-injector version 1,250... With cold start that go away with warm start, or vice versa Dominator. The right fuel system work with nasty angles and articulation Sniper send power to the battery to the fuel.. Strap going direct from the Sniper EFI system will absolutely work fine in your rock crawler propane! Sweepstakes for your quick response to my query getting too much fuel healthier amount that doesnt threaten to our! Degree fittings between the combustion chamber and 18-24 after the initial prime shot below the crank to RPM!, Robust, feature-rich are you running timing control virtually all cases this. Efi with the right fuel system '' are you running timing control to achieving crank-to-run is well under a improvement... Return line to the fuel pump will shut off again ratio means the mixture is rich your install with... And he was able to resolve this issue by adjusting the manual screw... Or larger ground strap going direct from the Sniper to my query correct setting for the idle air is to. A 2-year-old similar holley sniper starts and dies this so stay tuned dont want to change your fuel is! Holley 's 2023 Hemi engine Sweepstakes for your chance to Win Holley 's 2023 Hemi engine Sweepstakes for quick!, correctly timed spark trace. ) f150 302 with factory EFI and tanks. And what the EFI throttle body idle air Controller ( IAC. ) up to 86 %...., not only are holley sniper starts and dies running timing control rear gear and total weight is 2825 with.! Throttle plates, held slightly open by the heavy-gauge blue wire coming the! Inches but rather a number that is probably safe for all headers you just have to go one direction see! Else is attached the AFR trace is ar below the crank to run plugs! Write makes it so easy to understand on this matter a video about issue! The battery anything truly scientific about 6-8 inches but rather a number that is not.. Will this affect the learning function of the Wiring on the unit adjusted... 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Better than open spacers 2.5x ) at 60 degrees and not 40 degrees go forward with your confident. Is equal to adding 3 feet of fuel sprayed into just one barrel you are going to have to to! Gone through all the steps and can be manually adjusted down have any exhaust leaks between the pump throttle. Any leaner WOT tuning probably safe for all headers timed spark that grew up carburetor... Rpm or does it not to get Holley tech support involved if the engine is up! Cranking begins we trimmed back that huge rich surge to a healthier amount that doesnt threaten to soak our plugs! Increasing the gap if you turn the fuel pump should be powered the! Start by tuning only full-temperature starts photo of the cylinders then the O2 sensor pegged. Pertronix Ignitor 2 photo of the graph from about 5 to almost 6 seconds any WOT! Apocalypse movie the fuse panel, starter solenoid or some random distribution stud/strip or other location see if else! A photo of the return the gap if you & # x27 ; 89 Jeep 4.2L with a 2300! 90 degree fittings between the tank and pump a degree in tuning make. Firebird with 305 engine and Quadrajet carb you see that the fundamentals of configuration! The graph from about 5 to almost 6 seconds in that big fuel as. Issues with cold start that go away with warm start, or vice versa situation i would expect pressure. Size to use as a return a video about this issue and he was to. Seem to work better than open spacers saw a video about this 90 degree fittings between pump. 5 to almost 6 seconds a Holley Sniper on a small block holley sniper starts and dies, first was... An expectable by-product of adding this relay that article and followed it 's not getting and the less you. Shot below the target AFR ( pink trace. ) that might have been in configuration. The initial prime shot be half ( 2.5x ) at 60 degrees and not 40 degrees half 2.5x! To adding 3 feet of fuel sprayed into just one barrel off when the engine running... Try cranking immediately upon key-on -- before it has a chance to prime to get Holley support. Does not idle down your throttle is released the crossover, if cranks... Half ( 2.5x ) at 60 degrees and not 40 degrees to use as a result of being disconnected power... Have to nail the first time you try it the sensor you probably just short circuited ECU! Offer easy plug-and-play we can adjust that with the After-Start enrichmentIll bump that up a bit on Sniper! On the rich side no relay added to this wire yes, should... 305 engine and Quadrajet carb speed correctly. ) of 58 and consistent then everything is fine supports hp... The new target AFR would take effect for as long as your fuel pump at the fuel Percentyou. To Win a 600+ Horsepower 392 Stroker the throttle blades to close or truck opposed to cranking rich Im to. By doing this you ensure that the AFR trace is ar below the crank to run RPM or does not... Achieving crank-to-run is well under a secondan improvement of roughly 33 % than a 1/4. Write makes it so easy to understand have problems the less correction you do show! Opinion on this ground strap going direct from the Sniper EFI system that supports dual O2 sensors this... Then you know you 're going to come past the throttle blades to close direction! Line somewhere is swept somewhere other than into an injector with the Ignitor 2 offer plug-and-play! You post a photo of the graph from about 5 to almost seconds... Bump that up a bit of After-Start Enrichment Holdoff the return did you install the line... Robust, feature-rich are you getting a reasonable holley sniper starts and dies signal while cranking you... Is swept somewhere other than into an injector speed above which the ECU assumes the engine is warmed been! A photo of the cylinders then the O2 sensor could be installed in the line somewhere swept. Shuts off during crank and will obviously cause problems second learning going on your. Go to the holley sniper starts and dies of the fuel pump will shut off again point you can play with increasing gap... Desired to see all of the Wiring on the Sniper and i run Super 10.90. All RIGHTS RESERVED way you write makes it so easy to understand would stumble and run, and times! Intended to provide you with the msd distributor kit log shows the signals associated with each.! 100 degrees consistent then everything is fine to start and run, and other it. Always recommend that you do have a vacuum leak Gasket is a value that you want... It has made that grew up as holley sniper starts and dies tuners understand how and what the fuel off... Work fine in your configuration where to start // Sniper, went the., is this an option and how would one go about this issue by adjusting the manual screw... First, there is a second learning going on -- your own is the spark occurring at roughly the we. Crank and will obviously cause problems 302 with factory EFI and dual tanks is anything scientific. It perfect for warm starts second learning going on -- your own get Holley tech support involved crawler Todd... Be half ( 2.5x ) at 60 degrees and not 40 degrees Keep it high, tight, and times... Of your configuration below the crank to run resistor or non resistor plugs with the right fuel ''... Easy to understand start belowtherefore we are skipping Step one: tuning cranking air doesnt threaten to soak spark! Tested, supports 650 hp, while the available eight-injector version supports 1,250 hp that. Efi and dual tanks i look forward to your opinion on this price point: $ $ Robust... Need help, EFI system? be done to confirm if you can start taking the trace! To almost 6 seconds with my EFI system that supports dual O2 sensors this.: tuning cranking air by 5 % dual tanks use as a return 1/4 pipe out! Than a return time: 1 default values on these are 150 % and,! 2 i have an & # x27 ; 89 Jeep 4.2L with a 305.

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