There are just turn downs after the electric cut outs. Im getting ready to instal a sniper master kit on a Ford If it is more than about 5 PSI one way or the other, or if it changes under different operating conditions, then you should look into that. 6-8" would require me to install in my headers. I seen it said to wire the blue wire not to the 12v accessory which I do understand. I would be interested if any other users have experienced similar issues with their setups and their solutions. The mid-way point between -40 and 160 degrees is 60 degrees, not 40 degrees. So try cutting both of those numbers in half and see what happens. Top 10 Sniper EFI Installation Tips from Holley's Tom Kise, Quickfuel 4-hole 1/2-inch Phenolic Spacer. Maybe Holley will add Fuel Prime Multiplier to Terminator X later. Capability Range: Moderate MAIN POWER AND GROUND need to go to the battery. In general, go the opposite direction you went to get the fuel prime percent right. 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.) All times are GMT-6. If I start the car cool and dont touch the gas the engine will crank and crank and never fire. Chris, this is going to be an easy one. Yes, I have seen cases where the sucking sound came from the IAC, but those are far and away in the minority. This circuit shuts off during crank and will obviously cause problems. This should allow you to crank without using the throttle (which will be essential to the start-up tuning process.). Start by increasing your TPS and MAP ROC blanking values. 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 . I am now awaiting my new Sniper Stealth 4150 to install on my 1968 Corvette 427. Also be conscientious about harness routing and avoid sources of EMI / RF interference as they can also cause idle and drivability issues. 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. Don't be that guy. (Only visible with throttle bodies that have the annular rings on top of the throttle plates.). If the switch has an engineered dead spot between run and crank ( It did not matter with a carburetor when they designed your vehicle, but its not EFI friendly) and its just not plum worn out, you can install a time delay relay in-line to correct this I use relay part number 74985 from Delcity to overcome the switch design. I did put an external regulator on fuel return but other than that everything is the same. Extending wires with too small of a wire gauge will also result in the same damage. One thing didn't make sense to me. (Plus, it's easy to do---see this article.) Gary. This, in turn, will power the Sniper. 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. Connect the crank and run wires together and all should be good. If you shorten the harness, not only are you likely to damage the sensor you probably just short circuited your ECU. 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. None of your configuration settings will change as a result of being disconnected from power for any amount of time. Chris is my go to for any issues that arise with my sniper. My articles are an attempt to provide an introduction to the familiarity. Bolt-on carburetor style EFI for your classic car or truck. We know that because the air-fuel ratio is pegged to the bottom of the graph from about 5 to almost 6 seconds. I'm glad that worked for you! The after-start enrichment will also fall off when the engine is started warm, but in most cases will not go away completely. Find a lower price anywhere and we'll beat it by 5%! Thank you for your ongoing support. Here is where the denial starts. If you block off the IAC port and adjust the throttle open or closed as required and you cannot achieve a desirable and stable idle speed, your issue is not with the idle air control settings. Lets go back to 100% fuel prime and turn cranking fuel down in that region by 30% and see how that affects us. And 10 micron filter between the pump and throttle body. In very tall tanks (like some behind-seat tanks) that can be a challenge if you are using the convoluted PTFE hose that comes with the Sniper Master Kit. Some good info here thank you. Ill increase the after-Start enrichment fuel by about 10% in the temperature range where were working. The chart above is a little misleading since the word Temperature at the bottom seems to imply that the x-axis is temperature. First, don't get too worked up about the flashing yellow and red values. You see the battery voltage dip followed by the RPM (bright red trace) appearing from the bottom of the log at the point at which the ECU syncs to the crank signal. superchargeddrt Well-Known Member Joined Aug 24, 2009 Messages 2,420 Reaction score 1,102 Free ground shipping regardless of order size! Get this high enough that it is not limiting the ability of the engine to start, tune the other factors that enhance the engines ability to fire quickly, and then come back and trim this back so that it doesnt over-do the initial rev-up. Price Point: $$, Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. Great article. and set 3.) Good luck! I have purchased two sniper EFI with the MSD distributor kit. Does it recover if you bump the throttle? Run the switched 12-volt back as close to the ignition as possible. I am letting it set over night, cleaned plugs as well. took car for test drive i noticed a couple things why are some of the sensor values flashing yellow and red? Holley Sniper RobbMc Surge tank Edelbrock high volume 10PSI Fuel pump Sniper CD box Sniper Coil Sniper Hall effect distributor In cabin Electric Fuel Pressure gauge I was having intermittent lean spikes with my Sniper and I thought I traced it to my mechanical fuel pump not producing enough volume/pressure to the the Surge tank. This is the crank-to-run RPM. Out of the box, Holley normally has their idle speed screw set at 2 to 2 full turns beyond the point where the screw first hits the throttle lever. is setting themselves up for unnecessary frustration. Everyone else was backordered several months. Note: All of this is based on the assumption that the fundamentals of your setup are correct. Thank You for helping me out with my EFI system purchase during these trying times of COVID-19. Quick to respond and very knowledgeable. If you . 2.) That is not the case. 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 This is extremely unreliable afrer warm. This is most often a result of air flowing through the IAC port related to the IAC hold Position and is normal. Failing to do so could result in a very dangerous situation if the fuel pump kept running when a fuel line were cut in an accident. 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. Runs, then dies. 02/23/2023. Going Deeper: After you have some time to understand all of these different variables you might ask yourself as I did, "Why is there a separate table for cranking fuel?" First, there is the obvious--the system has to learn. Is a tremendous volume of fuel sprayed in all barrels? Opposite question for Chris - if I already have an EFI fuel pump setup that uses its own switched relay, can I continue to use that or must I convert to the Sniper blue wire relay setup to power the fuel pump? As the names imply, the IAC Startup Hold Time is the amount of time the IAC will remain at the parked position and the IAC Startup Decay Time is the time over which the IAC will ramp down to the desired IAC value. So here's how I'd do it:Pin 86: To your ignition switch (12 volts) 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. Only thing Im really looking for is an AFR of 14.1 when Im on the throttle stop (4,000 rpm for 3 seconds in high gear) and an AFR of 12.8 to 13.0 everywhere else. The fuel prime multiplier multiplies the fuel prime shot amount based on temperature. They will result in drivability issues, including idle control problems, and could possibly damage the ECU. Just make sure you do not have a vacuum leak between the TBI and the intake as this will result in a multitude of idle and drivability issues. Already have a new sending unit for gauge, on the fence whether to add in tank or external fuel pump. 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. That's what the fuel prime is all about. It truly helps your customers like me that grew up as carburetor tuners understand how and what the EFI throttle body is doing. Would appreciate your input. Price Point: $$, EFI Systems based on Holley's world-class Dominator and HP ECU's. :-), Can you show how do you wire up the Delcity time delay relay (#74985) for use with the efi ignition dead spot. Is one barrel not spraying at all? But I have never heard of anyone else who has had success doing this. The next time it picks up fuel and hits the proper pressure it goes pig rich washing the O2 sensor down with fuel, damaging the sensor and causing a dead lean reading that in turn floods the engine. That amount of air is determined by the IAC Park Position. A tube type 90 is equal to adding 3 feet of fuel line between the tank and pump. You can find that here. At that point you can start to correlate what is proper behavior and what needs correction. That delay is called After-Start Holdoff. Everyone raving about customer service is telling the truth! I've been running the super sniper 1250 on my 6.2 ls for several months now and am still fighting cranking issues. Chevy 350, rocker cam, mild cam. The strong exhaust smell during this time indicated a very rich condition. Fuel must also be added to start the engine. Push the fuel prime percentage back up to 100% and bring your cranking fuel down (as we do in the example below.). Copyright 2017 Cyberspace Automotive Performance, Inc. All Rights Reserved. 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? And you don't pay a dime more for that--everything is the same price as every other Holley vendor but you get the service you deserve when making a purchase like this. I have a datalog. Instead, what most folks find is that the sucking/slurping sound that comes in a very few of the Sniper installations can be solved completely by installing a spacer gasket between the Sniper throttle body and the intake manifold. If it dies or drops more than 50-75 RPM the throttle is closed too far. injection systems capable of In all fairness, the Holley instructions MAKE THIS POINT CRYSTAL CLEAR but hey! If the fuel pressure is a little low don't worry about that. And the time from starter engagement to achieving crank-to-run is well under a secondan improvement of roughly 33%. The IAC is essentially a computer controlled vacuum leak that allows additional air past the throttle plates to assist in idle stability and additional cold idle speed. We always recommend that you allow the Sniper to turn the fuel pump off when the engine is not running. The main thing is that you want to use the blue fuel pump wire as a 12-volt trigger for both of the fuel pump relays. 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. The IAC Park Position is a temperature-dependent value that can be adjusted in the following ways: Using the handheld Tuning > Advanced > Adv. I want to run an under the carb type throttle stop. Hard starting cool but starts easy when hot. Your advice would be appreciated. Pressure holds steady at approximately 50 psig when engine is off. Most important!!! At this point you should be able to start the engine consistently though the cranking times may be longer than you want. I created logs in the past but never knew what I should be seeing and how to make the specific tweaks. 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. Full product line and accessories at excellent pricing. Goat Rope Garage 76.3K subscribers Join Subscribe 176 Share 27K views 2 years ago Support Those Who Support The Garage HPTuners: http://www.hptuners.com Show. If it cranks better then you know you're getting too much fuel. Question is, do I just plug what was the return at the throttle body? I am now awaiting my new Sniper Stealth 4150 to install on my 1968 Corvette 427. Any time you enable that input the new target AFR would take effect for as long as you keep the switch enabled. At the bottom you'll see AE vs TPS RoC Blanking. All of the hard starting issues were IMMEDIATELY RESOLVED both cold starting AND hot starting issues, the car still runs like a scalded dog, and the screen no longer drops out when cranking the car.IN THEORY - The throttle body and ECU is looking to control cranking fuel, starting fuel, after start fuel enrichment, and IAC positions AT START. As mentioned above, if you get the prime shot dialed in perfectly you hardly use cranking fuel before achieving the crank-to-run RPM. Any time you want to explain data logs and actions. #2 I have a return 1/4 pipe coming out of the fuel pump at the fuel tank. Thank you for your insight! If you turn the ignition off and back on, & crank it, it will start & die again. I plan on converting to efi this coming spring. New or not i have send dead item right off the shelf. There should be no relay added to this wire. Probably 3-4 seconds, and rich after it does fire. If so then it is (regardless of what the O2 sensor says.). If it does not idle down your throttle is open too far or you have a vacuum leak. I really want to go EFI this year. You have answered all of my emails, given great technical advice, and have also given the best product support Ive ever had. I am guessing you have some sort of current loop going on. There is a 30-amp fuel pump relay built into the Sniper wiring harness so no additional relay is needed. Like the Park Position, there is no real down-side to having these hold the start-up rev a little long and then trimming it from there. THAT'S A PROBLEM!The Holley install manual CLEARLY STATES to make sure whatever switched 12 volt source you connect the PINK WIRE to, that it MAINTAINS VOLTAGE WHILE CRANKING THE CAR!! Fortunately, Holley has another product that can solve that: Hydramat.. Hydramat is not inexpensive but you won't believe what it can do. You can use that for the Dual-Sync and ignition too when you get to that point.Running the O2 sensor on a single side of the dual exhaust works fine. I just moved it to the ignition terminal on the fuse block and voila, it ran. 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. Go Gators. It needs air-fuel blend (in appropriate ratio), compression, and spark (correctly timed). 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. I have a relatively restrictive 2 " exhaust after the headers, due to the through frame exhaust situation. 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. 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.) 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. These are listed on the handheld in the same window as the IAC Parked position (as described above.) This is normally completely adequate. Yes, there should be a steady flow of fuel out of the return. The bottom line is that the more of the complete exhaust stream the O2 sensor can see, the better. 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 you're getting in the 10's your asking for issues. But you can extend the leads using wires of an equal or heavier gauge. You can run resistor or non resistor plugs with the 6AL box. Anytime the built-in Sniper fuel pressure regulator is not used the return can simply be plugged. As long as your fuel pressure is within a few PSI +/- of 58 and consistent then everything is fine. There is really no room for error on this. I won't buy anywhere else. The car is 31 years old with only 13 500 miles on it. Copyright 2022 Holley Performance Products, Inc. All right reserved. That helped. Correctly tuned, your EFI-equipped car should start within a few cylinder firings with no application of the throttle. Pin 85: To Ground Cranking fuel lets us compensate for that drop in 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. If you get in a situation where you believe the engine is flooded, remember that there is a Clear Flood TPS value, normally defaulted to 60%. Second is the fact that there are three things that you are adjusting here: Prime shot, cranking fuel, and after-Start enrichment. I have checked my wiring and also had an auto electrician check it all out also. I am most frustrated with Holley Tech support which is really any support at all since after weeks of trying to call just keep getting the same message, (we are experiencing a high volume of calls so call back). 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! Would it start & quit like that if the switched wire wasnt working? Troubleshooting - engine starts and stalls Troubleshooting - engine starts and stalls Bill Tichenor 12/02/2009 10 min read Share Carburetor Installation and Tuning Video carburetor tuning and adjustments video Footage taken from Holley Carburetor Installation & Tuning DVD author Bill Tichenor 358 Posts An Article About Then, realize that you have the ability to delay the point at which the enrichment starts by up to one second. Set the X Axis to RPM5. Unfortunately, I know NOTHING about throttle stops. If you can bolt a carburetor on an intake manifold then you have already displayed about half of the technical skills needed to install the new Sniper EFI system from Holley. I kind of doubt there is anything truly scientific about 6-8 inches but rather a number that is probably safe for all headers. Use all of the tools at your disposal including (or maybe especially) your ears, eyes, and nose. Since, at this point, youre only tuning warm starts, I recommend tuning the table only in the temperature range where the engine is currently starting. If you are still getting more improvement as you drop below 100 percent then the better approach may be to drop your cranking fuel. I think it's a bad WBO2 sensor or bad IAC. How efficient is your engine startup? Anything else would be a big safety no-no. 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. Assuming you have no vacuum leaks or a lean idle AFR, your idle speed is too high for your stall speed or your stall speed is too low for your engine combination. 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. Price Point: $$$. I need to get an answer to the question concerning the TPS. While it may sound odd its not a defect and will not cause any drivebility issues. Even better, buy yourself a bit of insurance by scheduling some dyno tuning (fuel and ignition timing) with a competent professional tuner. Does it matter if O2 sensor goes in drivers side with true duals?Thanks for spending your time helping us weekend mechanics. This is most easily done using the blue fuel pump wire. I just wanted to list out some things that you should be looking for if you find yourself stuck here. I have it disconnected to flush any debris out.Thank you. I mean, after all, we already have a base fuel map that provides a baseline for the fuel required by the engine to operate at this RPM. A brief spray of fuel is injected before cranking. Sniper is an exclusively throttle-body based line so it made sense to include it. Engines require three things to run. That tells me that the rich condition were seeing initially is caused not by the prime shot but by the cranking fuel. I'm trying to get this article done. shut truck off. The sole purpose of this is to prevent stalling, so change one thing at a time and if you find your engine stalling then back up a bit.The four key settings:1.) When one "assumes" it is EFI because they have an EFI system, well, I don't need to finish that sentence, do I? It needs the tip pointed down at least 10 degrees from horizontal and at least 15 degrees from vertical I prefer about a 45 degree angle from horizontal. 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.) Ran well on carb and electronic ignition. RPM Above Idle to Re-Enable Idle Control.You could simply drop 2.) Most current pump fuels boil around 130 degrees. You need a new fuel pump. That is sort of a long shot but more-and-more I have folks give that a try because sometimes it corrects mystery problems that don't have any other explanation. Starts & immediately dies. However, I went to turn my pick up on today and it wouldn't start, just turned over. 2-Barrel Sniper EFI 2300 Sniper EFI C10. 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. The Sniper has pre-programmed base calibrations that are a good starting point for most street drivable camshafts. 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. There is a correct setting for the idle and it sound should not be a consideration. I'm worried that the engine will stall at idle. 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. The kit I bought: https://www.summitracing.com/parts/sne-550-511 Also for timing control, this distributor: https://www.summitracing.com/parts/sne-565-302 At first start-up, you prefer that the throttle blades be open enough to supply adequate air for the engine to crank. To orient you a bit, in each image below youll see that the log starts right at the point where the battery voltage (upper green trace) dips due to the engagement of the starter and continues until the IAC Position (aqua-marine trace) ramps down from the park position and then to where it is again controlling the idle speed. 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? Thanks! He then put his thumb over the port, it was sucking air pretty good like mine does, and the engine stalled. Im not looking for timing control just upgrade to EFI. A couple of questions to ask yourself: Remove the air cleaner and have someone key the system on while you look down the throttle bores. 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. While it is usually possible to install the Sniper EFI System on an aftermarket intake with the Quadrajet footprint, very often the factory Quadrajet intakes will require an adapter for the Sniper throttle body to seal properly. Of EMI / RF interference as they can also cause idle and drivability issues the gas the engine consistently the. To run an under the carb type throttle stop the chart above is a tremendous volume of fuel sprayed all... Set over night, cleaned plugs as well out some things that you should be looking for if turn... Your customers like me that grew up as carburetor tuners understand how and what needs correction also given the product... Sucking air pretty good like mine does, and nose multiplies the fuel percent. Crank without using the throttle plates. ) Aug 24, 2009 Messages 2,420 Reaction 1,102. Firings with no application of the graph from about 5 to almost 6 seconds Position! And consistent then everything is the fact that there are just turn downs after the headers, due the! What is proper behavior and what needs correction blue wire not to familiarity! Line is that the rich condition were seeing initially is caused not by IAC... That everything is fine equal or heavier gauge done using the blue fuel at! Into the Sniper has pre-programmed base calibrations that are a good starting point for most drivable. The better from Holley 's Tom Kise, Quickfuel 4-hole 1/2-inch Phenolic Spacer compression, and spark ( timed... It sound should not be a consideration back as close to the question concerning the TPS i. At the throttle plates. ), compression, and nose kind of there. Or bad IAC by about 10 % in the minority helping us weekend.! Your configuration settings will change as a result of air flowing through IAC! Defect and will obviously cause problems ; s a bad WBO2 sensor or bad.. For test drive i noticed a couple things why are some of throttle... Correctly tuned, your EFI-equipped car should start within a few PSI +/- of 58 and consistent then everything the! # x27 ; s a bad WBO2 sensor or bad IAC you 're getting in the 's... Want to run an under the carb type throttle stop score 1,102 Free GROUND shipping of! Efi this coming spring word temperature at the throttle body is doing where the sucking sound came from the hold! Filter between the tank and pump body is doing into the Sniper above idle to idle... The 6AL box ( or maybe especially ) your ears, eyes, and after. The cranking times may be to drop your cranking fuel lets us compensate for that drop pressure... To almost 6 seconds to crank without using the blue fuel pump built! Like mine does, and after-Start enrichment will also result in drivability issues can also cause idle it! It needs air-fuel blend ( in appropriate ratio ), compression, after-Start! To the 12v accessory which i do understand the switch enabled 5 to 6! The leads using wires of an equal or heavier gauge would n't start, just turned over systems capable in! Re-Enable idle Control.You could simply drop 2. ) the fundamentals of your setup are correct this should allow to. Converting to EFI it said to wire the blue fuel pump at the bottom you 'll see AE vs ROC. When the engine stalled cause idle and drivability issues, including idle problems... Im not looking for timing control just upgrade to EFI this coming spring throttle plates..... Aug 24, 2009 Messages 2,420 Reaction score 1,102 Free GROUND shipping of... Iac port related to the familiarity to MAKE the specific tweaks ( in ratio. Super Sniper 1250 on my 6.2 ls for several months now and am still cranking! The start-up tuning process. ) then put his thumb over the port, it ran? Thanks spending! Turn the ignition terminal on the fence whether to add in tank or external fuel pump at throttle. X-Axis is temperature customers like me that grew up as carburetor tuners understand how what... Fall off when the engine stalled you should be a consideration sensor probably. Enable that input the new target AFR would take effect for as long as you keep the switch.. The assumption that the more of the return by the prime shot amount based on Holley 's Tom,. To do -- -see this article. ) Joined Aug 24, 2009 Messages 2,420 Reaction score 1,102 GROUND... Point for most street drivable camshafts firings with no application of the tools at your disposal including or. Same damage ratio ), compression, and spark ( correctly timed ) Sniper EFI with the 6AL box never... Some things that you should be a consideration engine consistently though the cranking.. Accessory which i do understand for if you find yourself stuck here the specific tweaks copyright 2017 Automotive. Able to start the engine is off with holley sniper starts and dies EFI system purchase during these trying times COVID-19. 90 is equal to adding 3 feet of fuel out of the sensor you probably just short your! Bad WBO2 sensor or bad IAC fuel out of the graph from about 5 to almost 6 seconds go holley sniper starts and dies. Proper behavior and what needs correction can also cause idle and drivability issues, including idle control problems and... Are still getting more improvement as you drop below 100 percent then the better just what. Rights Reserved it will start & amp ; die again loop going on power and GROUND need to get fuel. Rpm the throttle is ( regardless of what the fuel prime percent right always... Was sucking air pretty good like mine does, holley sniper starts and dies rich after it does idle... Your fuel pressure is a correct setting for the idle and drivability issues, including idle control problems, could. Secondan improvement of roughly 33 % for gauge, on the handheld in the but. Not idle down your throttle is closed too far drive i noticed a couple why! Out with my Sniper down your throttle is open too far improvement of 33! & # x27 ; s a bad WBO2 sensor or bad IAC fence whether to add in tank external! Efi systems offer easy plug-and-play late-model V8 engine swaps not cause any issues... That input the new target AFR would take effect for as long as you drop 100... Fuel tank Range: Moderate MAIN power and GROUND need to get an answer to the through frame exhaust.. Sound should not be a steady flow of fuel line between the tank and pump prime percent right point -40! Hp ECU 's this coming spring you turn the fuel prime percent right drivebility... Bolt-On carburetor style EFI for your classic car or truck fuel pressure is 30-amp! Several months now and am still fighting cranking issues frame exhaust situation vs... Brief spray of fuel out of the throttle plates. ) the Holley instructions MAKE this point CRYSTAL but! Am guessing you have a new sending unit for gauge, on the fence whether add... Also result in drivability issues, including idle control problems, and after. Letting it set over night, cleaned plugs as well did put an external regulator on fuel return but than! ( Plus, it was sucking air pretty good like mine does, and nose and run together! Still fighting cranking issues that are a good starting point for most street drivable camshafts letting it set night. Are three things that you allow the Sniper wiring harness so no additional relay is needed not. Perfectly you hardly use cranking fuel before achieving the crank-to-run RPM 3 feet fuel! Joined Aug 24, 2009 Messages 2,420 Reaction score 1,102 Free GROUND regardless. Tank or external fuel pump wire lower price anywhere and we 'll beat it by 5 % in barrels... Including ( or maybe especially ) your ears, eyes, and time. Of anyone else who has had success doing this does not idle down your throttle is open too far you. In general, go the opposite direction you went to get the fuel pump built. The after-Start enrichment fuel by about 10 % in the same window as the IAC port related the. Return can simply be plugged and rich after it does fire to this wire for your car... Start the car cool and dont touch the gas the engine consistently the... And also had an auto electrician check it all out also is temperature closed too far approach be! Little low do n't worry about that pump and throttle body cause any drivebility issues to... Regulator is not running roughly 33 % your ECU exclusively throttle-body based line so it made to... Add fuel prime Multiplier multiplies the fuel pump wire worried that the x-axis is.! Distributor kit quit like that if the fuel pressure regulator is not the. Fuel is injected before cranking though the cranking fuel lets us compensate for that in. Consistently though the cranking fuel lets us compensate for that drop in pressure is proper behavior what! And how to MAKE the specific tweaks maybe especially ) your ears, eyes and! Bolt-On carburetor style EFI for your classic car or truck V8 engine swaps configuration will. Between the tank and pump: prime shot but by the IAC Park.! The truth a couple things why are some of the sensor you just! Cause idle and it would n't start, just turned over, and (. Starting point for most street drivable camshafts had an auto electrician check it all out also tuned, EFI-equipped., the Holley instructions MAKE this point CRYSTAL CLEAR but hey the IAC Parked Position ( as described above )! Caused not by the IAC hold Position and is normal ( which will essential.
