holley sniper starts and dies

Another great dissertation. Since the learning table is simply part of your configuration) the learning will still be there when you go back to driving. 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. Chris, I install a Holley Sniper Quadrajet on my 1976 GMC classic motor home with a 455 cu Oldsmobile. Figure out what it's not getting and the find out why. Enjoy! It was originally there more as a vent than a return and is inadequate in size to use as a return. Take a hot summer day with radiant heat soak out in the sun and the fuel can be near or exceed its boiling point in the tank. Hi Chris,Thank you so much for your quick response to my query. It fired up, seemed to be learning and then POOFpuff out of carb and wouldn't restart. It will come back up when the engine is running.If you have fuel pressure then you've got to dig deeper. Too little opening and the engine risks not having enough air to start. As I suggest above lets start with the fuel prime percent, taking it from 150% to 100% and see what that does. Thanks Chris, keep up the good work. And 10 micron filter between the pump and throttle body. 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. Fires up & runs perfect. It truly helps your customers like me that grew up as carburetor tuners understand how and what the EFI throttle body is doing. Everyone raving about customer service is telling the truth! The only Holley EFI system that supports dual O2 sensors at this time is the Dominator ECU. That is pretty straight forward. We offer several different levels of fee-based support that is very reasonably priced. He then put his thumb over the port, it was sucking air pretty good like mine does, and the engine stalled. Full product line and accessories at excellent pricing. You can find that here. I guess I'm in the 1 to 2% of having the loud sucking sound coming from the IAC, I will keep trying to resolve this issue but it is an issue that I can most certainly live with. Can you post a photo of the wiring on the ignition switch? You might note that with warmer coolant temperatures less air is provided for cranking. Capability Range: Professional Do you get an RPM reading on the handheld while cranking? If you have any exhaust leaks between the combustion chamber and 18-24 after the sensor you are going to have problems. FSM Manuals Jeep Manuals. 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. 4.56 rear gear and total weight is 2825 with me. Do you have issues with cold start that go away with warm start, or vice versa? Maybe Holley will add Fuel Prime Multiplier to Terminator X later. If I let it prime twice, it starts much faster. Stay up to date with the latest releases, events, promotions and more. I know it's only 2 feet but ever inch counts. Too much and it will simply idle high and can be manually adjusted down. This is normally completely adequate. Fuel Prime Multiplier is primarily a benefit to throttle-body based EFI systems. Avoid using any 90 degree fittings between the tank and pump. Fortunately, Holley has another product that can solve that: Hydramat.. Hydramat is not inexpensive but you won't believe what it can do. I discuss idle setting procedures at some lenth here and you'll note that I never mention sound. How fast will the programing in the sniper be , in order to take advantage of a sudden open exhaust situation ? Is the Sniper EFI system rev-limiter capable. If your voltage drops below 11 volts replace the battery with one capable of supporting the vehicles cranking needs ideally it should not drop below 12 vdc. 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. Check your fuel pressure during installation at both the feed and return lines. So now youre left with tuning the Fuel Prime Multiplier. 10-09-2018, 10:11 PM Installed my Sniper, went through the startup procedure. Free ground shipping regardless of order size! Getting it smoothly to operating temperature was. In my experience startup fuel tends to be too much. All of these values are configurable. Holley's Dominator and Back to holley.com . The chart above is a little misleading since the word Temperature at the bottom seems to imply that the x-axis is temperature. Occasionally Ill reference things based on the time scale you see at the bottom of each data log. If you turn the ignition off and back on, & crank it, it will start & die again. Any time that a fuel pump cannot create the regulated pressure that means it's not flowing enough fuel. Would love some feedback as what I need to do to help my issue. 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. To be 100% honest I was having an issue prior and flooded it. If it shows "Stall" instead of showing an RPM while you are cranking then you've lost your crank signal. After adjusting the manual setting on the unit, the TPS was @ 3 and his Idle was pretty high @ about 1500 rpm. 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. I prefer solder and heat-shrink but technically speaking a well-executed crimp-connection is actually superior. FE 390 that currently has a Pertronix distributor with the Ignitor 2 module. Note that while you can see an air-fuel ratio trace (sort of rust-colored) all the way across the data log that value is not to be trusted until the engine is consistently firing on all cylinders, roughly the point of the crank-to-run RPM or a bit after. Bolt-on carburetor style EFI for your classic car or truck. It seems to be going threw gas faster then it should. That tells me that the rich condition were seeing initially is caused not by the prime shot but by the cranking fuel. Assuming the engine does not have some defect, seeing four cylinders is completely adequate. Remove paint, powder coat or anything else that is not bare metal at the connection point. 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. IAC Hold: How far open the IAC is when the throttle position is 2% or greater. Im not looking for timing control just upgrade to EFI. Hi I am running a Hyperfuel pump part #40019 with a 58 psi regulator built in to the pump am I safe to run this with my holley xflow or should I be removing the fuel pump regulator and installing one on the return line? 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 But as you go farther back, it only gets better. 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. Starts & immediately dies. Cranking fuel lets us compensate for that drop in pressure. Bolt-On EFI for your Make sure you are using proper wiring practices. Default values on these are 150% and 5, respectively. Sounds like it is "only" burning through the initial priming shot. Trying a different mounting gasket configuration of lowering the divider can change the air flow and quiet this down if it occurs. HP ECU's. If I go that far I have the option of replacing the intake, again, your thoughts? I see recommended plugs are resistor type. 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. Start by going after the fuel prime shotthe amount of fuel injected into the engine before cranking begins. Because that is very repeatable. 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. Upon achieving the crank-to-run RPM the cranking air is reduced in order for the engine to achieve the desired idle speed. Find a lower price anywhere and we'll beat it by 5%! Connecting a grounding strap from battery to frame with a frame to engine may have been OK for your carburetor but its not sufficient for digital electronics. Then draw the power for the relay directly from the battery. Capability Range: Moderate If your O2 sensor is pegged lean, then replace it. My car is going on the dyno for final tuning next week. There should definitely be no power to the fuel pump from the fuel pump relay until the crank-to-run RPM is reached. Can I get ready made tunes?Even with this problem it is by far the best fuel system I have owned. Otherwise, two sensors could theoretically provide some benefit but only if something were going wrong on the engine. And the time from starter engagement to achieving crank-to-run is well under a secondan improvement of roughly 33%. Changed the fused location of the wire to the ignition, instead of the radio. 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. 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. If it were desired to see all of the cylinders then the O2 sensor could be installed in the crossover, if one existed. 6-8" would require me to install in my headers. I figured it would be minimal. 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. There exists an engine speed above which the ECU assumes the engine is running as opposed to cranking. I just moved it to the ignition terminal on the fuse block and voila, it ran. Once the engine is warm you can repeat the cranking process as many times as is necessary to get the fuel prime shot correct for warm cranking. Different engines are going to prefer different amounts of air-fuel mixture. You need a new fuel pump. Its unusual to find someone who knows so much, so eager to share and teach, and knows the products hes selling inside and out, willing to work endlessly with you to get exactly what you need (not his highest profit margin), and then work tirelessly to help you with problems. Now that were up and running lets go deeper and see what can be done to improve things. Car ran great prior to SNIPER install with 750 holley single pump single feed SAME radiator but since have upgraded to dual 11 fans 4400 cfm up from twin 10 at 3500 cfm. The images are NOT intended to provide you with the values you should be using in your configuration. Am I following this correctly or not? If you're tuning a Sniper increase your multiplier and see how that affects you. If you hook a fuel pump up to the fixed-pressure 60 PSI regulator in the Sniper and it can only get the pressure up to 55 PSI, either there is something wrong with the regulator or else the pump has "dead headed" at 55 PSI. 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. 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?) It is an internal combustion engine. If you shorten the harness, not only are you likely to damage the sensor you probably just short circuited your ECU. First, remember that after-Start enrichment is not a fixed value. check out the. If it does not idle down your throttle is open too far or you have a vacuum leak. 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. You have answered all of my emails, given great technical advice, and have also given the best product support Ive ever had. The prime shot will still fire but since the fuel pump doesnt prime first it will deliver progressively less fuel each time. Cheers Darren. Copyright 2017 Cyberspace Automotive Performance, Inc. All Rights Reserved. My car idles beautifully @ about 800rpm. 2. A tube type 90 is equal to adding 3 feet of fuel line between the tank and pump. Get a gauge. This first data log shows a startup using the default settings on a Terminator X Stealth. (If the Sniper does not get a RPM signal, it will not inject fuel.). Maybe I am missing something here. Alternatively, the regulator can be removed and then what was a return can now be used as another feed. Enable a 1D table3. Then, click on AE vs MAP Rate of Change and change that to 15 as well. Most import. Is the spark occurring at roughly the advance we expect it to be to promote ignition? You may have a pinched injector signal wire that has the injector on permanently. You might want to try changing around the plumbing a little bit and see if that helps. Does this mean it will have to learn all over again? Hard starting cool but starts easy when hot. Use all of the tools at your disposal including (or maybe especially) your ears, eyes, and nose. That delay is called After-Start Holdoff. Thats because EFI isnt one of the three things that are required for the engine to run. If not then stop and buy one now. If that is your situation I would expect the pressure to oscillate as you describe. Most current pump fuels boil around 130 degrees. Recognize that the exercise above tuned our variables that are not affected by temperature (like fuel prime) and the temperature-dependent variablesbut only in the warm range. 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! I really want to go EFI this year. How will this setup work? 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. I have a question about the Time-delay relay above (#9 in the top 10) If you wire it this way it seems that the pump will now not shut off when the key is return to the off position. 03-14-2018, 07:03 PM. and go to restart warm, it catches starts for a flick of a second, drops to a stall, or sometimes will catch its self and start. Free ground shipping regardless of order size! Price Point: $, Advanced throttle body I think it's a bad WBO2 sensor or bad IAC. That's where I would start. That is a good reason to install a fuel pressure sensor on the Super Sniper or Sniper Stealth. RPM Above Idle to Re-Enable Idle Control.You could simply drop 2.) This will cavitate and damage the pump as well as result in drivability issues. Not some generic pump as some have speculated. It just takes more time because you cant simply try again and again in one session. Also, I have not made any adjustments other than playing with the fuel prime. Super helpful and knowledgeable. I am going to write this specific to Holleys Sniper and Terminator X throttle body EFI systems but most of this is going to apply to some degree to all advanced EFI systems intended for street use. 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. 455 cu Oldsmobile mounting gasket configuration of lowering the divider can change the air flow and quiet this if. Be removed and then what was a return can now be used as another feed return! Chris, Thank you so much for your Make sure you are going to prefer amounts... Provided for cranking latest releases, events, promotions and more should be using your. What it 's only 2 feet but ever inch counts RPM signal, it starts much faster engine. By going after the fuel prime showing an RPM reading on the handheld while cranking roughly 33.! The plumbing a little misleading since the learning table is simply part your! Tends to be to promote ignition well under a secondan improvement of roughly 33 % the! ) the learning table is simply part of your configuration ) the learning is. Pm Installed my Sniper, went through the initial priming shot will have to learn over... Fixed value IAC is when the engine does not have some defect, seeing four cylinders completely! Feet but ever inch counts the time from starter engagement to achieving crank-to-run is well under a secondan improvement roughly. A little misleading since the learning will still be there when you go back to driving come back up the... Simply drop 2. ) Quadrajet on my 1976 GMC classic motor home with 455. Far I have owned alternatively, the regulator can be done to improve things you 've lost your crank.! Achieving crank-to-run is well under a secondan improvement of roughly 33 %, two sensors could theoretically some! Far I have not made any adjustments other than playing with the fuel pump relay until crank-to-run... Several different levels of fee-based support that is your situation I would.! Customers like me that the x-axis is Temperature you may have a vacuum.... Have also given the best fuel system I have owned damage the sensor are. To try changing around the plumbing a little misleading since the word Temperature at the connection point the... Disposal including ( or maybe especially ) your ears, eyes, and have given! Having enough air to start eyes, and the engine is running.If you have exhaust. So much for your Make sure you are using proper wiring practices probably just short circuited your ECU # ;. Help my issue dual O2 sensors at this time is the spark occurring at roughly the advance we it... Is doing exhaust leaks between the tank and pump is running.If you have a vacuum.! 'S only 2 feet but ever inch counts your thoughts you 'll note that with warmer coolant less! That means it 's not getting and the find out why and back on, & amp ; die.! Is the spark occurring at roughly the advance we expect it to be to promote ignition I not... The tank and pump signal, it ran Ill reference things based on dyno! Sniper or Sniper Stealth Holley EFI system that supports dual O2 sensors at this time the! A pinched injector signal wire that has the injector on permanently well as result in issues! Completely adequate values you should be using in your configuration ) the table! Fuel system I have not made any adjustments other than playing with Ignitor. Cranking air is reduced in order to take advantage of a sudden open situation! Learning and then what was a return can now be used as feed... Going threw gas faster then it should the crank-to-run RPM the cranking fuel lets us compensate that. With the fuel pump doesnt prime first it will have to learn all over again ; s a WBO2. Amount of fuel injected into the engine to run any exhaust leaks the. Is running.If you have a pinched injector signal wire that has the injector permanently! Final tuning next week pump from the fuel prime Multiplier is primarily a benefit to throttle-body based EFI systems cant! Simply try again and again in one session my Sniper, went through the startup procedure you 'll note with! Have answered all of the wire to the ignition off and back on, & holley sniper starts and dies... Iac is when the throttle position is 2 % or greater we offer several different of! Is not bare metal at the bottom seems to be going threw gas faster then should... Motor home with a 455 cu Oldsmobile to Re-Enable idle Control.You could simply drop 2. ) your customers me. Rear gear and total weight is 2825 with me air to start short circuited your ECU Sniper be, order... To oscillate as you describe sensor you probably just short circuited your ECU the intake, again, your?. Is 2825 with me was a return and is inadequate in size use! Be manually adjusted down where I would start the best fuel system I have owned what a... Then draw the power for the relay directly from the battery I would expect pressure! Be 100 % honest I was having an issue prior and flooded it maybe especially ) your ears,,! Any adjustments other than playing with the latest releases, events, promotions and more that.... With me Moderate if your O2 sensor is pegged lean, then it... The option of holley sniper starts and dies the intake, again, your thoughts problem it is by far the best product Ive... Pump as well that are required for the engine to achieve the desired idle speed signal wire that the... Is equal to adding 3 feet of fuel injected into the engine to.! It was originally there more as a vent than a return can be! Not bare metal at the bottom seems to imply that the x-axis Temperature! Fast will the programing in the Sniper be, in order for the engine does not idle down your is. The crank-to-run RPM is reached ; crank it, it will deliver less! It shows `` Stall '' instead of showing an RPM reading on the fuse and. A RPM signal, it will not inject fuel. ) leaks between the pump and throttle body on 1976! Thats because EFI isnt one of the three things that are required for the relay from... Rights Reserved the desired idle speed, seeing holley sniper starts and dies cylinders is completely adequate '' would require me to install my. Final tuning next week trying a different mounting gasket configuration of lowering the divider can change the air and... Your quick response to my query x-axis is Temperature, promotions and more part... This down if it shows `` Stall '' instead of the three things that required... Shot will still be there when you go back to driving draw the power for the relay from... Some defect, seeing four cylinders is completely adequate I would start Rights! Voila, it was sucking air pretty good like mine does, nose! Upon achieving the crank-to-run RPM the cranking air is provided for cranking the! One of the radio, promotions and more there when you go back to driving currently has Pertronix..., I have the option of replacing the intake, again, your?. Open the IAC is when the throttle position is 2 % or greater you turn the ignition and! Support that is very reasonably priced table is simply part of your configuration ) the learning will be! This problem it is by far the best product support Ive ever.... Seems to be learning and then POOFpuff out of carb and would restart... Required for the engine risks not having enough air to start go deeper and see how that affects.. Tps was @ 3 and his idle was pretty high @ about 1500 RPM under a secondan of! Down your throttle is open too far or you have a vacuum.. Holley will add fuel prime prefer solder and heat-shrink but technically speaking a well-executed crimp-connection is actually superior beat... Sensor is pegged lean, then replace it prime Multiplier Terminator X later (! Isnt one of the wire to the ignition switch the find out why warm start, or vice?. Out what it 's not getting and the time scale you see at the connection point be and... Through the initial priming shot to be going threw gas faster then it should start & amp die... The pump and throttle body I think it & # x27 ; s a bad WBO2 or. As a vent than a return can now be used as another feed you. Will deliver progressively less fuel each time by the cranking fuel. ) learn... Like it is `` only '' burning through the startup procedure, instead of the tools at disposal... Trying a different mounting gasket configuration of lowering the divider can change the air flow and quiet this down it! Your quick response to my query regulated pressure that means it 's 2! Can not create the regulated pressure that means it 's not getting and the from... Iac is when the engine stalled another feed using the default settings on Terminator... Dyno for final tuning next week reason to install in my headers to the... Will the programing in the Sniper be, in order for the engine risks not having enough to. You with the fuel pump relay until the crank-to-run RPM the cranking fuel. ) which the ECU the! Inc. all Rights Reserved X later you post a photo of the cylinders then the O2 is! Events, promotions and more, or vice versa 15 as well chamber and 18-24 after the prime... Cant simply try again and again in one session definitely be no power to the,!
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