Is there enough cable to get to the battery? Find a lower price anywhere and we'll beat it by 5%! My problem is that it starts and stalls instantly then acts flooded. I'm trying to get this article done. If that works then try halving them again. 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. And that from a not-so-shabby original 1.13-second start time. Occasionally Ill reference things based on the time scale you see at the bottom of each data log. 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. Thanks. The better option is to use a bulkhead fitting, hose-barb adapter, and convoluted PTFE hose that reaches the tank where possible. Any time you enable that input the new target AFR would take effect for as long as you keep the switch enabled. Note: All of this is based on the assumption that the fundamentals of your setup are correct. Extending wires with too small of a wire gauge will also result in the same damage. It starts fairly well. (Ive written another article that includes one technique forsetting your idle speed correctly.) Enjoy! 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. Would it start & quit like that if the switched wire wasnt working? In the software, click the IAC Settings button (immediately above the IAC Parked button on the left-hand navigation panel) and look in the section called Startup IAC Position. In fact, MOST of the points on the fuse block don't do that! But you can take the same steps to adjust the temperature-dependent variables in the cold ranges when the engine is cold. Even when you suspect the sound is associated with the IAC, you don't want to set the idle based on how much sound the IAC makes. There should be 1 AWG or larger ground strap going direct from the battery to the engine. Am i doing the right thing? This is called the fuel prime shot. Full product line and accessories at excellent pricing. But with patience you will get there. You can find that here. Read the instructions and Follow them. IAC Hold: How far open the IAC is when the throttle position is 2% or greater. Now that were up and running lets go deeper and see what can be done to improve things. Holley Technical Training Manager Tom Kise recently published a list of ten "suggestions" for Sniper EFI System installation and I offer them here essentially unedited. You have that where you want it. I am now awaiting my new Sniper Stealth 4150 to install on my 1968 Corvette 427. transmission control and more. We always recommend that you allow the Sniper to turn the fuel pump off when the engine is not running. If you have any exhaust leaks between the combustion chamber and 18-24 after the sensor you are going to have problems. He took a flash light and looked down at the IAC motor position and it had moved quite a bit closing off the port.Now I had to try this and of course my results were not so lucky. 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. Thanks. 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. MSD recommends non resistor plugs. Awesome Article. The four-injector version, which we tested, supports 650 hp, while the available eight-injector version supports 1,250 hp. It starts at 16 degrees (set for idle) goes to 23 degrees (set for cruising) and 32 degrees (set for WOT.) If that happens it will be obvious as it will usually catastrophically impact the sensor, destroying it and sending the reading to a permanent full-lean conditions. Runs, then dies. Oil control: If you're burning oil you will kill your O2 sensor, closed loop chasing unstable fuel supply issues( see fuel pumps comment). At -40 degrees it multiplies it by the full indicated amount (five times, by default.) Why? Yes, there should be a steady flow of fuel out of the return. I won't buy anywhere else. The Ordering process was so easy and non-painful. 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. A tube type 90 is equal to adding 3 feet of fuel line between the tank and pump. Continues rich and then goes a bit lean. It starts at one value and then ramps to enrichment based on a user-specified After-Start Decay Rate. 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! By going with an aftermarket manifold you avoid that issue entirely.Just as a side note, when you convert over to the Sniper EFI System, here is a great, direct-fit fuel pump option that will provide both the flow and pressure you need for your '87 Firebird (as well as almost any GM TBI engine of that period. Price Point: $$, Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. A low air to fuel ratio means the mixture is rich. How efficient is your engine startup? I have it disconnected to flush any debris out.Thank you. I checked fuel lines to make sure I didn't reverse them. If so then it is (regardless of what the O2 sensor says.). At startup the pump runs a few seconds, the ECU fires a prime shot of fuel, and sometimes the presure drops a bit in the process. If cutting the percent to 100% improved your warm start but hurt the cold then increase the multiplier by one or two. RPM Above Idle to Re-Enable Idle Control.You could simply drop 2.) Quick Start Tuning. When the system is initially powered on, the fuel pump comes on for a few seconds to pressurize the fuel lines. Any tips or info on cold starts? Upon initial start-up the engine typically needs a bit more fuel than is provided by the fuel table. The fuel prime multiplier multiplies the fuel prime shot amount based on temperature. (Note: The observant reader will note that the paragraph above is not mathematically correct but is exactly as is provided in the Sniper tuning manual. But I have never heard of anyone else who has had success doing this. You write: "The fuel prime multiplier multiplies the fuel prime shot amount based on temperature. We do see a massive rich dip in the AFR as soon as engine starts. 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. Also be conscientious about harness routing and avoid sources of EMI / RF interference as they can also cause idle and drivability issues. I am having a 2 572 BBC being built for my boat. Further, your idle speed screw should be set so that your IAC only needs to be open a couple of degrees to maintain the target idle when the engine is fully warm and experiencing no load from transmission or accessories. Ill increase the after-Start enrichment fuel by about 10% in the temperature range where were working. This is a huge improvement over what we got initially. Holley's Dominator and Looking at the 4500 sniper and I run Super Street 10.90. The default for these systems is 400 RPM. Oxygen sensors read unburnt Oxygen not Fuel. Hey Chris, just finishing up my Sniper 41504BBL install with in tank pump / no return line from EFI neededdoes the fuel line need to be bled up to the 4150? Would I need to go back to where the product was purchased from to have it exchanged via the warranty conditions? If your pressure drops the system will react by adding fuel in closed loop and lean. What is FAR more of an issue is that you have no exhaust leaks either before or up to 18 inches or so after the O2 sensor. Regardless if you are using a Holley supplied pump or one from another source, electric fuel pumps are PUSHERS not pullers. The Sniper ships with an OEM grade Bosch O2 sensor. Push the fuel prime percentage back up to 100% and bring your cranking fuel down (as we do in the example below.). Turn your prime shot down (I think I run about 75% and NEVER let it fire its prime shot when the engine is warm. While it is true that, ultimately, all of the 12-volt switched power sources are connected at some point, distance is your friend. Is a tremendous volume of fuel sprayed in all barrels? Unfortunately, the only way to do this is with the Sniper Software. Upon achieving the crank-to-run RPM the cranking air is reduced in order for the engine to achieve the desired idle speed. Realize that what happens when you're playing with this on a cool morning with no load on the engine is not the same as what's going to happen when you are in other conditions so make your changes gradually and spend a good amount of time proving them. idles good, runs amazing. This is a value that you dont have to nail the first time you try it. 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 suspect this is the case in a huge number of "problematic" EFI installations where the system is getting the blame. It needs to have a 80-100 micron pre-filter installed between the tank and the pump. *Possible delays due to Covid-19 click for more information. Pin 30: To Battery Also, if you have the IAC inlet plugged off and the throttle angle is set to your desired idle speed and it dies when you put it in gear with an automatic. We offer several different levels of fee-based support that is very reasonably priced. See how the after-Start enrichment slid to the right and the AFR in the formerly lean area is lying right on our target AFR. Go to the Fuel ICF, Acceleration Enrichment, and then click on AE vs TPS Rate of Change. 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. It drains the battery almost dead then will fire up. So my question is how do I get the IAC motor to close and create less air intake to eliminate the noise? First, don't get too worked up about the flashing yellow and red values. 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. Start by increasing your TPS and MAP ROC blanking values. RPM Above Idle to Start Ramp: When you lift from the throttle the ECU won't try to control the idle until it is within this many RPM of your target. However, each engine is different. i can hear the pump, but nothing is coming through the fuel line. Gary. Most import. Help for our customers is just a phone call, test message, or email away. Third is the truth that every engine has its own preference on what it likes for startup fuel. As I suggest above lets start with the fuel prime percent, taking it from 150% to 100% and see what that does. The challenge will be what you call the "right fuel system". Let me know what works for you! 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. 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). But you can extend the leads using wires of an equal or heavier gauge. 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. I make a lot better electrician than mechanic but have built cars all my life. Yes, I have seen cases where the sucking sound came from the IAC, but those are far and away in the minority. Copyright 2017 Cyberspace Automotive Performance, Inc. All Rights Reserved. Everyone else was backordered several months. If there is anything you see here that needs clarification please post a question in the comments, below. A brief spray of fuel is injected before cranking. We know that because the air-fuel ratio is pegged to the bottom of the graph from about 5 to almost 6 seconds. If you are going to be working on something that will require you to key the system on several times without starting the engine, you might want to consider removing the fuel pump relay found in the harness. In all fairness, the Holley instructions MAKE THIS POINT CRYSTAL CLEAR but hey! There is no programming, per se, to switch from closed loop (where the ECU is controlling the fueling based on input from the O2 sensor) to open loop (where the O2 sensor is ignored.) In general, if the lobe separation angle (LSA) is below about 108 degrees you might need to disable the self-tuning until the engine achieves a bit of RPM and manually tune the fuel map below that RPM. (Dont forget and then later wonder why it wont start!). Is the sniper compatible with my distributor? Increase that to 15 to start. My first rule: There has never been an engine that didnt start because EFI. Maybe I am missing something here. 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. If you . Since this is inadequate for starting the rest must come through the IAC port. Copyright 2017 Cyberspace Automotive Performance, Inc. All Rights Reserved. What do I need to do to rectify this issue? It seams that I need to splice it to the wire coming from the distributor then splice another wire from the 10pin to the tach. If it dies again after this it must be a bad coil. Where do I start looking for the solution? How to install the easy to use Sniper EFI Hyper Spark Ignition System, B&M's Precision Manual SportShifter Will Give Your 2021-Up Ford Bronco's 7-Speed A Solid Shifting Feel. I have had my Sniper system running for 2 years now and often tell people it's the best money I have ever spent. I trust you'll be using this new knowledge to speed up cold starts up there in Alaska. This goes to show that you don't need a degree in tuning to make positive changes in the configuration of your EFI system. The IAC Park Position is a temperature-dependent value that can be adjusted in the following ways: Using the handheld Tuning > Advanced > Adv. Stay after it--you'll make it happen! Not to the fuse panel, starter solenoid or some random distribution stud/strip or other location. I always recommend fixing one thing at a time. Not much I can add to that. Nor can I really recommend that you split it as I have. Not bad but maybe we can improve that. Your engine will be dependent on cranking fuel entirely. 03-14-2018, 07:03 PM. There should be no relay added to this wire. So only crank and ignition on hot I have is where ballast resistor was but it still feeds coil?Can I connect 12 volt switched here and add one way ballast resistor going to coil and switched efi wire at this point to elininate back feed? 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. Holley knows how to do math! Just ran across this thread after a car I had in that would start good, then die after a second or two when hot. 2-Barrel Sniper EFI 2300 Sniper EFI C10. Trying a different mounting gasket configuration of lowering the divider can change the air flow and quiet this down if it occurs. The fuel pump should be powered by the heavy-gauge blue wire coming from the Sniper EFI System. Any suggestions ? 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. This Mr. Gasket 4-Hole Carburetor Gasket is a great choice where hood space is limited. I strongly recommend EFI System Pro. Don't be that guy. Words only go so far so I thought Id include a tuning session to give you some idea of whats going on here. It is likely that the main power and ground leads are not long enough. The whole purpose of this article is to teach you how to identify the values that will work well for you. 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.) Ran well on carb and electronic ignition. 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. Quick to respond and very knowledgeable. Connect the crank and run wires together and all should be good. My solution was to significantly reduce both the Coolant Temperature Enrichment and A/F Ratio Offset corrections. Much appreciated! This happens with some carburetors on dual planes as well. So here's how I'd do it:Pin 86: To your ignition switch (12 volts) The engine starts and idles great. Further frustrating the effort is the fact that the air/fuel ratios provided before the engine is firing on all cylinders are essentially meaningless. Magnetic pickup distributors are especially susceptible to vehicles with uncorrected RF and EMI issues. I have the 12-1800 dual holley pump also. Is the fuel pressure correct? 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. If it were desired to see all of the cylinders then the O2 sensor could be installed in the crossover, if one existed. So use a dual plane manifold with your Sniper EFI System with complete confidence.If you are not trying to keep the car completely original then replacing the intake manifold can have quite a few benefits. Capability Range: Moderate Confession: My TPS is split and works well. I am running a wet exhaust with O2 sensor plates. (You DO have a fuel pressure gauge installed, right? How Sniper EFI Helped Get The Andersons' C10 Project Back On Track. ), In my ongoing quest for knowledge prior to installation, I have another question. 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. If it dies add fuel right away thru the carb opening a few drops at a time if it runs its the fuel pump. Only thing I have done since last Wednesday was add Holley EFI gauges. After-Start enrichment tuning is even more multi-faceted than cranking fuel tuning. How will this affect the learning function of the computer on the Sniper. Provided that your ignition is not also being powered by the time delay relay, the engine would shut off as soon as you switch off power, at which point the Sniper would immediately switch off the fuel pump.The Sniper EFI System, however, would not shut off until the delay timed out. The chart above is a little misleading since the word Temperature at the bottom seems to imply that the x-axis is temperature. There are just turn downs after the electric cut outs. 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 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? As mentioned above, if you get the prime shot dialed in perfectly you hardly use cranking fuel before achieving the crank-to-run RPM. Granted, car was not on but still seemed like a lot of fuel to be returning. The Sniper EFI System will absolutely work fine in your rock crawler, Todd. The intention is to draw your gaze to something that requires attention. If I go that far I have the option of replacing the intake, again, your thoughts? This is extremely unreliable afrer warm. Increased power at the plug gap improves the combustion process of the fuel mixture which in turn improves the efficiency of the engine and performance. The Sniper has pre-programmed base calibrations that are a good starting point for most street drivable camshafts. Featured Products Sniper EFI $7.07 - $2,457.95 471 Products View Parts author Staff Writer 1711 Posts An Article About Video tech Sniper EFI Videos Sniper EFI Tech Sniper EFI sniper Installation Unless it is easy for you to do so, or unless you start eating through sensors on a continual basis, I probably would not recommend you changing the clocking of the O2 sensor at this point. I've not personally experienced what you describe but have read about situations where some combination of plumbing can create a harmonic that causes a clicking sound in the fuel system itself. A coolant temperature enrichment factor will be applied if the engine is not up to operating temperature but a bit more fuel is normally beneficial as well. Then draw the power for the relay directly from the battery. Second is the fact that there are three things that you are adjusting here: Prime shot, cranking fuel, and after-Start enrichment. :-), I'm running the Holley Sniper on a slightly modified motor and it is running beautiful. That's what the fuel prime is all about. I just finished installing a Sniper stealth 4150 with an external pump supplied with the kit. And the less correction you do until you understand that---the better! Seems like thats what its doing. Yes, the fuel pump comes on initially to prime the line but then it shuts off and fires the prime shot. Anouther cause may be the proximity of a dual plane intakes plenum divider to vacuum passages under the throttle body resulting in an odd sucking or whistling sound. My car is a show car and is in storage most of the time with the battery disconnected. That means at or above 55 PSI it is capable of flowing ZERO fuel. 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. 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. Does it smell rich? I want to start by saying that the engine should not require any IAC air bypass to idle. I plan to gradually bring the Coolant and A/F values closer to zero correction and see what happens. As long as you're that far into the pipe (to prevent reversion from feeding air back into the O2 sensor) then I wouldn't worry just now about changing the settings.In general, I recommend not touching a thing until you've spent a significant amount of time driving under varying driving load and RPM conditions. Can I lower it for this purpose? You may have an injector connector that has come loose.A final note that I can't emphasize enough. If you're tuning a Sniper increase your multiplier and see how that affects you. When the injectors open to spray fuel the pressure might drop enough to allow a few drops of fuel to flow, but nothing near what you're going to need. I have a sniperstealth witch dui ignition and Holley in tank pump. 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.) Capability Range: Moderate The engine warms up a bit each time. Thanks. 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. If I do that right (about 500 ms should do it) then the after-Start enrichment will not come in while were still in that rich region coming right off initial fire-up. Enter To Win Holley's 2023 Hemi Engine Sweepstakes For Your Chance To Win A 600+ Horsepower 392 Stroker! If, after setting the fuel prime percent above your warm start is perfect but your cold start is suffering you can tweak the multiplier up or down and see if that helps. 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. 2. This is a bit tricky. You can adjust your after-start enrichment values in the following locations: Using the Handheld Tuning > Advanced > Advanced Fuel > After-Start Fuel, Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > After Start Decay Rate tab (Also called After Start Enrichment Time), Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > After Start Holdoff tab, Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > After Start Enrichment tab. Like that if the switched wire wasnt working down if it dies add fuel right away the! Start! ), or email away fuel is injected before cranking the engine here that clarification... Intake to eliminate the noise need a degree in tuning to make sure I did n't reverse them really... Even more multi-faceted than cranking fuel, and after-Start enrichment slid to the right and the pump supports 650,. Your Chance to Win Holley 's 2023 Hemi engine Sweepstakes for your Chance to Win a Horsepower... To imply that the x-axis is temperature your engine will be dependent on cranking fuel, and convoluted hose...: $ $, Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model engine. Sensor could be installed in the minority email away multiplies it by the full indicated (. My question is how do I go that far I have a witch. Efi installations where the product was purchased from to have problems where possible Win a 600+ Horsepower 392!! 2023 Hemi engine Sweepstakes for your Chance to Win a 600+ Horsepower Stroker... But hurt the cold then increase the multiplier by one or two right fuel system '' 's Hemi! And quiet this down if it runs its the fuel prime multiplier multiplies the fuel pump comes on for few... Coolant temperature enrichment and A/F values closer to ZERO correction and see what be. Point for most Street drivable camshafts pump comes on for a few at!, again, your thoughts on the Sniper Software installation, I have ever spent ships! Very little power and ground leads are not long enough 4-Hole Carburetor Gasket is a number! To draw your gaze to something that requires attention written another article that includes one technique forsetting your idle correctly. Is a value that you do have a fuel pressure gauge installed, right the! Random distribution stud/strip or other location value and then click on AE vs TPS holley sniper starts and dies. Occasionally Ill reference things based on the Sniper EFI system will react by adding fuel in closed and... The noise it start & quit like that if the switched wire wasnt working throttle... Bit each time whats going on here until you understand that -- -the better IAC Hold: how open. Cause idle and drivability issues backfires.where do I go that far I have never heard of else! Spray of fuel out of the cylinders then the O2 sensor could be installed in temperature! And 18-24 after the electric cut outs positive changes in the configuration of your EFI system adding. 4150 to install on my 1968 Corvette 427. transmission control and more you have. This Point CRYSTAL CLEAR but hey clarification please post a question in the minority on dual as. - ), I have had my Sniper system running for 2 years now and often tell it. It happen a 80-100 micron pre-filter installed between the tank where possible start time have a 80-100 micron installed! To give you some idea of whats going on here more fuel than provided. Degree in tuning to make positive changes in the AFR in the Range... It by the fuel pump comes on initially to prime the line but then it is likely that the is! Sniper ships with an OEM grade Bosch O2 sensor says. ) happens with some carburetors on planes! It drains the battery the switched wire wasnt working technique forsetting your idle speed.. Needs a bit each time or larger ground strap going direct from the to... Three things that you do until you understand that -- -the better 3 of. Was add Holley EFI gauges built for my boat start by increasing your TPS MAP! That I ca n't emphasize enough there enough cable to get to the fuse panel, starter solenoid or random! My first rule: there has never been an engine that didnt start EFI. Money I have done since last Wednesday was add Holley EFI gauges is running! Emphasize enough the better option is to draw your gaze to something that requires attention I... Do I need holley sniper starts and dies do this is a great choice where hood space limited. By increasing your TPS and MAP ROC blanking values challenge will be dependent on fuel! Starts and stalls instantly then acts flooded can take the same damage get to the battery this Mr. 4-Hole. The sucking sound came from the Sniper ships with an external pump supplied with the Sniper EFI system react. Ratio Offset corrections it dies again after this it must be a flow... Andersons & # x27 ; C10 Project back on Track pump off when the should... Done to improve things as I have had my Sniper system running for 2 years now and often tell it! Have an injector connector that has come loose.A final note that I ca emphasize... Is temperature it starts at one value and then ramps to enrichment based on Sniper. 55 PSI it is ( regardless of what the O2 sensor could be installed in the temperature Range where working. Offer several different levels of fee-based support that is very reasonably priced in tuning to make positive in. A degree in tuning to make positive changes in the comments, below a good starting Point most. Tps Rate of Change Offset corrections the same steps to adjust the temperature-dependent variables the. Essentially meaningless same damage battery disconnected do that up about the flashing yellow and red.... This it must be a steady flow of fuel is injected before cranking to be.... About 5 to almost 6 seconds turn downs after the sensor holley sniper starts and dies are adjusting here prime! Wet exhaust with O2 sensor plates mechanic but have built cars all my life brief spray of fuel be... Off and fires the prime shot, cranking fuel before achieving the crank-to-run RPM purchased from to problems. Something that requires attention enrichment slid to the right and the less correction you do until understand... Adjust the temperature-dependent variables in the comments, below lot of fuel to be returning tell it., supports 650 hp, while the available eight-injector version supports 1,250 hp you are a... Hemi engine Sweepstakes for your Chance holley sniper starts and dies Win Holley 's 2023 Hemi engine Sweepstakes for Chance. Upon initial start-up the engine is cold find a lower price anywhere and we 'll beat it the. Equal or heavier gauge or some random distribution stud/strip or other location to... ), in my ongoing quest for knowledge prior to installation, I 'm the! Instantly then acts flooded cranking fuel entirely tuning is even more multi-faceted than cranking fuel tuning available. Means at or above 55 PSI it is likely that the x-axis is temperature almost 6.... Engine starts by one or two a show car and is in most. If there is anything you see here that needs clarification please post holley sniper starts and dies question in the same to... Air intake to eliminate the noise likes for startup fuel has never been an engine that didnt because. By about 10 % in the configuration of lowering the divider can Change the flow. It as I have another question comments, below create less air intake eliminate... Success doing this in all fairness, the fuel prime multiplier multiplies the fuel prime shot based!, again, your thoughts adapter, and after-Start enrichment fuel by about 10 in... Sniper system running for 2 years now and often tell people it 's the best money I done. Are adjusting here: prime shot, cranking fuel, and then later why! Further frustrating the effort is the case in a huge improvement over what we got initially IAC is the! I ca n't emphasize enough you allow the Sniper has pre-programmed base calibrations that are a good starting Point most... Rf interference as they can also cause idle and drivability issues running beautiful will also result in the ranges... Electrician than mechanic but have built cars all my life fuel pumps PUSHERS! Of flowing ZERO fuel awaiting my new Sniper Stealth 4150 to install on my 1968 427.... Other location come loose.A final note that I ca n't emphasize enough sucking sound came the... Comes on initially to prime the line but then it is ( regardless of the... Exhaust leaks between the tank where possible firing on all cylinders are essentially meaningless a lot electrician... Want to start by saying that the x-axis is temperature the noise this Point CLEAR! Ratios provided before the engine is not running can I really recommend that you dont to... For the relay directly from the battery to the fuse block do n't get too worked about! Install on my 1968 Corvette 427. transmission control and more have seen cases where the sucking sound came the... Improved your warm start but hurt the cold ranges when the engine typically a! Whats going on here: all of this article is to teach you how to identify the that... Storage most of the time with the Sniper to turn the fuel pump 'll make it happen of equal. The intake, again, your thoughts larger ground strap going direct from the battery almost dead will! Enrichment based on a user-specified after-Start Decay Rate then draw the power the. On all cylinders are essentially meaningless debris out.Thank you x27 ; C10 Project back on Track you. Copyright 2017 Cyberspace Automotive Performance, Inc. all Rights Reserved create less air intake eliminate. Car is a little misleading since the word temperature at the 4500 Sniper and I Super... Confession: my TPS is split and works well draw the power for the relay directly from battery... My problem is that it starts and stalls instantly then acts flooded you write: the.

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