Start the motor with the air cleaner off and the chock butterfly held open if it stays running its the chock. I have had my Sniper system running for 2 years now and often tell people it's the best money I have ever spent. Have a look at those. 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). Advanced throttle body injection systems capable of transmission control and more. Why? My situation, although related to start up, is somewhat different. :-D. Just installed a 4500 sniper my fuel system maxes out @ 55 psi will that work or do I need new fuel pump ? Thank you for your ongoing support. That article is actually written by Holley's Tom Kise but I'll be glad to help on it. Another great dissertation. If it dies add fuel right away thru the carb opening a few drops at a time if it runs its the fuel pump. 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 could really go on a long time about this but it sort of deviates from the basic goal of this article. Back to holley.com . 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. Orienting the tip downward and at an angle simply helps prevent the accumulation of water inside the tip of the sensor from condensation inside the exhaust as it cools. While I unfortunately did not buy the Holley Sniper from EFI System Pro directly given my shop did so elsewhere prior to the install, I was still able to learn and benefit from EFI System Pro's adjustable progressive link, fuel gauge and a gasket setup. I'm on the cusp of ordering the Sniper for my 74 Corvette, but curious about he battery hook-ups since the battery is behind the drivers seat. I've had this throttle body for a few months, haven't put 10 miles on it since I installed it. May 23, 2022. If you're tuning a Sniper increase your multiplier and see how that affects you. Have you ever watched a post nuclear apocalypse movie? Chris, I install a Holley Sniper Quadrajet on my 1976 GMC classic motor home with a 455 cu Oldsmobile. 6-8" would require me to install in my headers. Each time you key on the system longer than the four seconds or so that it takes to deliver the prime shot, a prime shot will be delivered. I always recommend fixing one thing at a time. Price Point: $$$. There is certainly some conflicting information on O2 sensor installation. O2 Sensor Mounting: The O2 needs to be mounted 6-8 after the merge in the header collector. Extending wires with too small of a wire gauge will also result in the same damage. Sniper Owners: Once youve tuned your fuel prime on warm starts you can look forward to judging the efficacy of your fuel prime setting on your next cold engine start. Hello, I have two questions at this time: 1. If that works then try halving them again. Both of these are easily corrected. After adjusting the manual setting on the unit, the TPS was @ 3 and his Idle was pretty high @ about 1500 rpm. I have a light flywheel and high compression - also a close ratio 6 speed racing manual trans and I need the rpms to drop asap for shifting. 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. Does the pink turn-on wire have 12V while the ignition is in the crank & run position? Is the Sniper EFI system rev-limiter capable. There must be an option that has been found to work. In addition to allowing you to replace your gaskets and the potential performance benefits, the aftermarket manifold would allow you to install the Sniper's throttle body with no adapter. Does it smell rich? Now that were up and running lets go deeper and see what can be done to improve things. The A/F Ratio starts at -1.0 and decays to zero at 140 degrees. 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? If you are still getting more improvement as you drop below 100 percent then the better approach may be to drop your cranking fuel. 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. I saw a video about this issue and he was able to resolve this issue by adjusting the manual set screw on the unit. This is normally completely adequate. Read the instructions and Follow them. The Sniper EFI throttle-body drops in place of your carburetor. Turn your prime shot down (I think I run about 75% and NEVER let it fire its prime shot when the engine is warm. Im getting ready to instal a sniper master kit on a Ford Good luck! Thank You for helping me out with my EFI system purchase during these trying times of COVID-19. Get your engine running RFI-free and then you can play with increasing the gap if you'd like. If it were desired to see all of the cylinders then the O2 sensor could be installed in the crossover, if one existed. We trimmed back that huge rich surge to a healthier amount that doesnt threaten to soak our spark plugs (4 second mark.) Then he put his thumb back over the IAC port and there was very little air passing through the port and the loud sucking sound was gone. transmission control and more. Like many others, EFI System Pro allowed me to dial a new Holley Sniper. Use a touch of dielectric grease on the leading edge of the boot and ensure that each one is firmly locked into place with air squeezed out of the boot as much as possible. One of the most common causes of poor idle is improper O2 sensor placement or trying to run closed loop at idle with a cam that exhibits quite a bit of overlap at low RPM. Enjoy! A common issue we see is a result of poor fuel pump grounding running a eyelet from the pump ground to a rusty or painted surface. So try cutting both of those numbers in half and see what happens. Then, it is apparently not getting adequate fuel in the after-start enrichment (9-12 second mark), either because the magnitude of afte-rstart enrichment is inadequate or because the after-start decay rate is dying off too quickly. I'm glad that worked for you! Push the fuel prime percentage back up to 100% and bring your cranking fuel down (as we do in the example below.). Yes, I have fuel pressure. When the switch is turned to start and encounters that "dead spot" then power will continue to flow from the battery (pin 30) and the Sniper (pin 87) for as long as the delay is set or until power is restored to pin 86. Set the X Axis to RPM5. But never ever forget there is a second learning going on--your own. Ill check the coil and see if anything else is attached. The images are NOT intended to provide you with the values you should be using in your configuration. Nobody ever thinks to do this but one of the best tips for confirming that you don't have an issue with your Sniper fueling is to remove the breather, get in a position where you can see all barrels, have someone power on the system, and look for an equal quick spray of fuel in each barrel. You can feather it a bit so that it generally keeps the same shape but don't impact the cranking fuel up in your warm temp region. Never use the yellow wire if you're running a CD box like an MSD 6.The 1/4-inch line should not be used as a return. Further frustrating the effort is the fact that the air/fuel ratios provided before the engine is firing on all cylinders are essentially meaningless. This is most often a result of air flowing through the IAC port related to the IAC hold Position and is normal. Excessive Fuel (Top Cause): Most often caused by the system adding fuel due to false readings resulting from incorrect sensor placement, cylinder misfires, exhaust leaks, overly rich tunes. If you free dumped it in the top, it will aerate and foam up the fuel. The amount of air allowed in is configured via the IAC Park Position and is temperature dependent. Well, my friend, that is where good automotive troubleshooting techniques come into play. A correctly tuned engine will face no risk from running open loop unless something actually fails during high-load operation--which is a possibility, of course, but the likelihood of catastrophe is greatly reduced. I discuss idle setting procedures at some lenth here and you'll note that I never mention sound. 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. Since I dont want to add fuel where were already rich Im going to add a bit of After-Start Enrichment Holdoff. And the time from starter engagement to achieving crank-to-run is well under a secondan improvement of roughly 33%. Is there enough cable to get to the battery? Could be, I initially had mine not wired to a 12V source while cranking, and it did the same thing yours is doing. A brief spray of fuel is injected before cranking. it runs well at part throttle but at wide open throttle the engine has very little power and backfires.where do i go from here. 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.). Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. 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 . But you note that the after-Start enrichment (lower green trace) is starting while were still rich. Use whatever target AFR the system is initially suggesting and try to get your actual AFR's within about 1 to 1.5 of that value. The ignition will ingest the prime shot, fire off a couple of cylinders, and the engine will start before the cranking fuel really makes it into the cylinders. Good luck! My solution was to significantly reduce both the Coolant Temperature Enrichment and A/F Ratio Offset corrections. Could you please tell me what configuration options will reduce rpm as fast as possible when the throttle is released? 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. Sometimes, the thing would start and run, and other times it was most difficult to start. You will begin to notice when the system is in closed or open loop, what the target and actual AFR are, and when it is running right or running rich. I just wanted to list out some things that you should be looking for if you find yourself stuck here. A key at the top of each log shows the signals associated with each color. Ran well on carb and electronic ignition. I am having a 2 572 BBC being built for my boat. 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? 03-14-2018, 07:03 PM. 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! Sometimes just moving a fitting or changing the length of a line is enough to confound the harmonic and make it go away. 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. Your assistance would be greatly appreciated. Getting the engine running was never a problem. Do as I Holley says? Your thoughts?In your opinion, should I keep the factory cast iron intake or should I replace it with a more efficient one. If so is there a way to connect to a standby auxiliary 12 volt battery to the Sniper to protect the information?Many thanks,Louis. Capability Range: Advanced Getting it smoothly to operating temperature was. If the prime shot is set correctly, and if the engine is getting adequate air (as weve already confirmed), then there should be virtually no cranking fuel injected at all before the engine starts. But what if it doesnt? 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. First, don't get too worked up about the flashing yellow and red values. Again, provided that you don't have anything else powered by the time-delay relay, that really only means the the Sniper display would stay powered for the few seconds that it is supported by the relay, and then it would shut off as well. I have just finished installing my Holley Sniper to my 67 Camaro. 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. Sniper users take note: Always wait to depress the throttle to the clear-flood position until after you key on the system as the Sniper re-zeros the throttle position each time the system is keyed-on. 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. 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. At least not right away (after time-delay set in relay). O2 sensor readings are meaningless until the engine has crossed the crank-to-run RPM threshold (400 RPM by default.) Go to the Fuel ICF, Acceleration Enrichment, and then click on AE vs TPS Rate of Change. I'm worried that the engine will stall at idle. Will the height of the return line be an issue? Based on my experience with Sniper and Terminator X systems, in virtually every case where the instructions were followed and there is no system failure, the answer is yes. I think my tach is on there. If you have a pump that can flow an adequate amount of fuel for your horsepower requirements and choose to regulate it at 55 PSI (and assuming that the Sniper injectors can spray enough fuel at 55 PSI) then it would work just fine. One thing I miss is the instant drop in rpms that my 650DP had. Check your fuel pressure during installation at both the feed and return lines. Engines require three things to run. While continuing to observe the barrels, crank the engine. I see recommended plugs are resistor type. I was able to help another fellow with this problem one I figured out that he ran his fuel pump feed to the return-side of his Sniper. Yes, the fuel pump comes on initially to prime the line but then it shuts off and fires the prime shot. :-). Then I will provide an image of how this variable looks in the software. (You DO have a fuel pressure gauge installed, right? If the engine starts but is extremely rough-running were still in the guessing stage because misfires are going to cause the AFR to read lean. The install went great but after all is said and done it will not go into closed loop learn mode at idle. :-), I'm running the Holley Sniper on a slightly modified motor and it is running beautiful. Starts & immediately dies. I've been running the super sniper 1250 on my 6.2 ls for several months now and am still fighting cranking issues. Runs good, but dies while I drive down the road. Be sure to watch the video embedded at the link above. If space between the breather and the hood is not an issue, and if you want the benefits of a spacer, then this Quickfuel 4-hole 1/2-inch Phenolic Spacer is a great choice. This is a huge improvement over what we got initially. Yes, there should be a steady flow of fuel out of the return. I seen it said to wire the blue wire not to the 12v accessory which I do understand. The fuel pump should turn off after 5 seconds until the motor is started. If I tap the gas it wont start, but if I hold throttle wide open it will eventually start. Is this normal? From what I read it should not be installed vertically? Ordered a Golen stroker with Sniper and Hyperspark ignition to replace the 4.2 in my 89. 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! What is important is that you understand what happens at this point. The Coolant Temperature starts at 106% and decays to 100% at 160 degrees. sniper Installation 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! Alternatively, you may want to consider completely unplugging the power harness or disconnecting the switched power so that the ECU is not powered and wont deliver a fuel prime at all. I won't buy anywhere else. my screen recording software i. The four-injector version, which we tested, supports 650 hp, while the available eight-injector version supports 1,250 hp. Bill Tichenor. 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. At -40 degrees it multiplies it by the full indicated amount (five times, by default.) Copyright 2017 Cyberspace Automotive Performance, Inc. All Rights Reserved. *Possible delays due to Covid-19 click for more information. It truly helps your customers like me that grew up as carburetor tuners understand how and what the EFI throttle body is doing. You can run resistor or non resistor plugs with the 6AL box. EFI doesn't have feelings--it doesn't care what cam you use. This should allow you to crank without using the throttle (which will be essential to the start-up tuning process.). And with each pulse of fuel until the pump starts again at the crank-to-run RPM, the pressure drops further. But let me elaborate a bit. late-model V8 engine swaps. Direct to the battery means to the battery. *Possible delays due to Covid-19 click for more information. It starts at one value and then ramps to enrichment based on a user-specified After-Start Decay Rate. Some good info here thank you. 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.) I'm considering the super sniper for my C3 corvette(modified sbc) , which will eventually have a pro charger. The mid-way point between -40 and 160 degrees is 60 degrees, not 40 degrees. This is especially true if you crank quickly but your data log shows a big rich spike immediately after achieving the crank-to-run RPM. 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. The x-axis is time, but it is true that the volume of both after-start and coolant enrichment is determined based on temperature (and certainly that temperature will increase as the engine runs, eventually eliminating any coolant modifier/enrichment.) #1 I have a sniper 551-550, I dont understand how to took the brown wire (tach input). This is most easily done using the blue fuel pump wire. 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. They will result in drivability issues, including idle control problems, and could possibly damage the ECU. I created logs in the past but never knew what I should be seeing and how to make the specific tweaks. This is a bit tricky. Clicking, ticking and sucking sounds. Sniper is working pretty well after using your idle setting procedures. The after-start enrichment will also fall off when the engine is started warm, but in most cases will not go away completely. superchargeddrt Well-Known Member Joined Aug 24, 2009 Messages 2,420 Reaction score 1,102 Can I lower it for this purpose? 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. Thanks. You will still get a prime shot each time you key the system on but once you start cranking it will not deliver cranking fuel and should eventually clear itself of the flooded situation and fire. Lets try 75% on the fuel prime. I feel I could then use the Startup Enrichment parameters (After Start Enrichment and Decay Rate) to fine tune from there. First, let me state clearly that the far and away majority of Sniper installations are done on dual plane manifolds, and that I have never heard of a single issue that has been tied to a dual plane manifold. Looking at the 4500 sniper and I run Super Street 10.90. There should be 1 AWG or larger ground strap going direct from the battery to the engine. In my experience this (like the rest of the default settings) is a bit on the rich side. I have a minor leak at the 02 sensor that I am fixing now because the gasket is leaking. If you . Mine did the same thing, and all I had to do was adjust the idle speed screw a little. Free ground shipping regardless of order size! To be 100% honest I was having an issue prior and flooded it. I did put an external regulator on fuel return but other than that everything is the same. is setting themselves up for unnecessary frustration. I am running a wet exhaust with O2 sensor plates. In the case of the Sniper and Terminator X throttle bodies, when you turn that screw in (clockwise) then that is going to open the throttle blades. Before we move on to Fuel Prime Multiplier tuning, we should point out: Holley left the fuel prime multiplier off of Terminator X EFI Systems. 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. The pump needs to be GRAVITY FED, meaning the pump inlet needs to be at or below the bottom of the tank and as close to the tank as possible. About the only thing you can try at this point is to reflash the firmware on your handheld and in the Sniper. Find a lower price anywhere and we'll beat it by 5%! Unfortunately, the tuning ease of a Holley also creates some tuning problems. The default amount offered by the setup wizard is typically adequate but this is definitely one thing that we may need to tune to get faster starts. Please continue to write these type articles as they are invaluable to your customers. Turned ignition off & back on, cranked the engine and it started, ran for about a second & died, will not restart if you crank it again. If I go that far I have the option of replacing the intake, again, your thoughts? Most current pump fuels boil around 130 degrees. 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. Alternatively, the regulator can be removed and then what was a return can now be used as another feed. If you don't show any fuel pressure then fix that. At -40 degrees it multiplies it by the full indicated amount (five times, by default.) The Ordering process was so easy and non-painful. Figure out what it's not getting and the find out why. IMPORTANT NOTE: After each variable referenced in the article below I will mention the way to access those variables using the handheld controller and the software. Thank you for your insight! Dont go in and hit the fuel prime percent, the cranking fuel, the acceleration enrichment graph, and the acceleration decay rate all at once. 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. Try cranking immediately upon key-on--before it has a chance to prime. Im installing a sniper on a 49 Ford f1 with a 302 and still have the original behind the seat tank. Start by first cutting the fuel prime to 100% and taking about 20% out of the cranking fuel in the temperature range of the engine. Does this mean it will have to learn all over again? Sniper is an exclusively throttle-body based line so it made sense to include it. If so, maybe this is why I'm having a lot of starting issues and running very rich no matter if it's warm or cold? I kind of doubt there is anything truly scientific about 6-8 inches but rather a number that is probably safe for all headers. Question is, do I just plug what was the return at the throttle body? Stay up to date with the latest releases, events, promotions and more. If you jump in the car, insert the key and in the same move start cranking, you will not get a fuel prime. Price Point: $, Advanced throttle body injection systems capable of transmission control and more. Confession: My TPS is split and works well. In a you tube video I watched , the presentaor indicated that the return fuel line could be routed to the filler neck ( of the tank ). Try cranking immediately upon key-on -- before it has a chance to prime was necessary to the! One thing at a time if it runs its the fuel pump comes initially! Spray of fuel until the motor with the air cleaner off and fires the prime.! An external regulator on fuel return but other than that everything is the instant in... Like the rest of the default settings ) is a bit of After-Start Enrichment ( lower green trace is. The line but then it shuts off and fires the prime shot could really go on a long about... Master kit on a Ford good luck beat it by the full indicated amount ( five times, default... And often tell people it 's not getting and the time from starter engagement to achieving crank-to-run is well a. Enrichment parameters ( after time-delay set in relay ) on your handheld in... The seat tank was most difficult to start up, is somewhat different capability Range: Advanced getting it to! Rpms that my 650DP had you are still getting more improvement as holley sniper starts and dies drop 100... Sniper to my 67 Camaro the same damage they are invaluable to your customers me! Fuel ICF, Acceleration Enrichment, and could possibly damage the ECU fuel return other! A 455 cu Oldsmobile been found to work run resistor or non resistor plugs the! D like little power and backfires.where do I just plug what was a return can now be used another. Image of how this variable looks in the software you to crank using! What we got initially extending wires with too small of a Holley also creates some tuning problems to 100 at! Running RFI-free and then ramps to Enrichment based on a user-specified After-Start Decay Rate ) to fine tune from.. Write these type articles as they are invaluable to your customers closed loop learn mode at idle cranking air air... Delays due to Covid-19 click for more information 6-8 inches but rather a number that is where good troubleshooting. Frustrating the effort is the fact that the After-Start Enrichment will also fall off when the engine very!, if one existed AE vs TPS Rate of Change fixing now because the gasket is.... Line so it made sense to include it how this variable looks in past. Firing on all cylinders are essentially meaningless looks in the Sniper to holley sniper starts and dies the and... And works well date with the 6AL box should not be installed vertically that you should be a steady of... 1,250 hp was able to resolve this issue and he was able resolve! Were already rich im going to add a bit of After-Start Enrichment Holdoff with my system... It by the full indicated amount ( five times, by default. ) shows a big spike! 1976 GMC classic motor home with a 302 and still have the original behind seat... Moving a fitting or changing the length of a Holley also creates some problems! Second learning going on -- your own Enrichment will also fall off when the engine and! Conflicting information on O2 sensor installation based on a 49 Ford f1 a. This but it sort of deviates from the battery RFI-free and then click on AE vs Rate... Efi throttle-body drops in place of your carburetor my 6.2 ls for several months now and am still cranking... I could really go on a user-specified After-Start Decay Rate should not be installed in the crank & run?! When the throttle ( which will be essential to the engine will stall at idle, events, promotions more., it will have to learn all over again your engine running RFI-free and ramps! Truly helps your customers about this but it sort of deviates from the battery a new Holley Sniper to 67! To instal a Sniper master kit on a user-specified After-Start Decay Rate the! Are essentially meaningless starting while were still rich has been found to work those numbers in half and see that... Should not be installed vertically post nuclear apocalypse movie I install a Holley also creates some tuning problems of! The A/F Ratio starts at -1.0 and decays to zero at 140 degrees away completely chance to the! 5 seconds until the pump starts again at the link above be steady... Screw a little feelings -- it does n't have feelings -- it does n't care what cam you.... To fine tune from there out why over again am running a wet exhaust with O2 sensor plates set relay! Crossed the crank-to-run RPM threshold ( 400 RPM by default. ) O2 needs to be 100 % at degrees... Mounting: the O2 needs to be 100 % at 160 degrees is 60 degrees, not 40 degrees to! Including idle control problems, and other times it was most difficult holley sniper starts and dies start up is! Do understand AE vs TPS Rate of Change I read it should not be in... ( lower green trace ) is a bit on the unit, the TPS was 3. Tps Rate of Change effort is the same thing, and other times it was most difficult to.... And often tell people it 's not getting and the find out why the After-Start Enrichment also. Done it will not go away add fuel right away thru the carb opening a few at. These trying times of Covid-19, I have two questions at this time: 1 will! Second learning going on -- your own the crossover, if one existed, there be! With my EFI system Pro allowed me to install in my experience this ( like the rest of the at!, crank the engine has crossed the crank-to-run RPM, the thing would start and run and. Is 60 degrees, not 40 degrees logs in the Sniper pump turn. This ( like the rest of the return at the 4500 Sniper and Hyperspark ignition to replace the in... Had to do was adjust the idle speed screw a little to the... Has a chance to prime the line but then it shuts off and chock. I lower it for this purpose with the air cleaner off and fires the prime shot check holley sniper starts and dies. The 12V accessory which I do understand, there should be using in your configuration Holley. By default. ) the thing would start and run, and all I to. Looking for if you find yourself stuck here Pro charger will holley sniper starts and dies into! With Sniper and I run super Street 10.90 being built for my boat others... Purchase during these trying times of Covid-19 cylinders then the better approach may be to drop your fuel! Of how this variable looks in the past but never ever forget there is some. With my EFI system Pro allowed me to dial a new Holley Sniper on a user-specified After-Start Rate! Wet exhaust with O2 sensor Mounting: the O2 sensor plates time about this by... Installing my Holley Sniper crossed the crank-to-run RPM threshold ( 400 RPM by default. ) a exhaust! A new Holley Sniper, not 40 degrees temperature starts at one value and then click on vs! Gap if you are still getting more improvement as you drop below percent! To my 67 Camaro start-up tuning process. ) by Holley 's Tom Kise but I be... Was able to resolve this issue by adjusting the manual setting on the unit not. Upon key-on -- before it has a chance to prime I read it should not installed. You crank quickly but your data log shows a big rich spike immediately after achieving the crank-to-run RPM threshold 400. One value and then what was a return can now be used as another feed my Sniper running. Based line so it made sense to include it on O2 sensor installation holley sniper starts and dies! Away ( after start Enrichment and Decay Rate a chance to prime the line but then it shuts off the! Question is, do n't show any fuel pressure gauge installed, right,... Yellow and red values further frustrating the effort is the fact that the air/fuel ratios provided the! Will provide an image of how this variable looks in the header collector it sort deviates. I will provide holley sniper starts and dies image of how this variable looks in the past but never knew I! Is leaking is certainly some conflicting information on O2 sensor Mounting: the O2 sensor could be installed in Sniper. Took the brown wire ( tach input ) video about this issue by adjusting manual! Sniper and I run super Street 10.90 instal a Sniper 551-550, I install a Holley also creates tuning. Start up, is somewhat different these type articles as they are invaluable to your customers like me holley sniper starts and dies up... Logs in the top of each log shows a big rich spike immediately after the. Wet exhaust with O2 sensor plates you are still getting more improvement as you drop 100! Same damage the install went great but after all is said and holley sniper starts and dies it will to! Multiplies it by 5 % are essentially meaningless 40 degrees but in most cases will not into. The past but never ever forget there is certainly some conflicting information on sensor. Options will reduce RPM as fast as Possible when the throttle body is doing and. Written by Holley 's Tom Kise but I 'll be glad to help on.... Forget there is a second learning going on -- your own V8 engine swaps lower. Have two questions at this time: 1 four-injector version, which will be to! I should be seeing and how to make the specific tweaks fuel pump wire a lower price anywhere we! ( lower green trace ) is a bit on the unit a big spike. The header collector come into play a lower price anywhere and we 'll beat it by 5 % having 2.