Starts & immediately dies. Your engine will be dependent on cranking fuel entirely. But I can tell you that it is possible to use a switched input to activate a 1-Dimensional Advanced Table to do an air-fuel ratio offset that would allow you to set your target AFR to 14:1. My car is a show car and is in storage most of the time with the battery disconnected. But you note that the after-Start enrichment (lower green trace) is starting while were still rich. First is the fact that the engine can be getting either too much or too little fuel. seems to be running rich at a idle. Probably 3-4 seconds, and rich after it does fire. I always recommend fixing one thing at a time. 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.) 3.) Super helpful and knowledgeable. I can't find a good spot in the fuse block, I don't recommend this. Ramp Decay Time: How many seconds the ECU will use to lower your idle to the target once it drops within the range specified by item 2.). This is obviously an ongoing process. The better option is to use a bulkhead fitting, hose-barb adapter, and convoluted PTFE hose that reaches the tank where possible. (Chris: If you bought it here then I should have provided you with my cell phone number. (If the Sniper does not get a RPM signal, it will not inject fuel.). 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. This is most often a result of air flowing through the IAC port related to the IAC hold Position and is normal. I would add that this noise might occur in 1% - 2% of the cases so I don't generally recommend buying this spacer with the Sniper EFI System. 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. Will the height of the return line be an issue? First, don't get too worked up about the flashing yellow and red values. As your comment indicates you're aware, this prevents a bad situation from turning much worse if and accident cuts a fuel line and you are not able to shut off the fuel pumps manually. There should be no relay added to this wire. Holley's Dominator and Push the fuel prime percentage back up to 100% and bring your cranking fuel down (as we do in the example below.). And the smell is just about gone. 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. This is extremely unreliable afrer warm. 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. If you jump in the car, insert the key and in the same move start cranking, you will not get a fuel prime. Well, my friend, that is where good automotive troubleshooting techniques come into play. 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. So try cutting both of those numbers in half and see what happens. I have a aeromotive stealth 340 fuel tank. After adjusting the manual setting on the unit, the TPS was @ 3 and his Idle was pretty high @ about 1500 rpm. I have it disconnected to flush any debris out.Thank you. This is a CRITICAL safety control and the reason why one should never consider powering their fuel pump with any power source that is not controlled by the ECU. "I've edited the article with a note about the difference. Another great dissertation. If everything is wired correctly and this happens then I'd say you have a problem with your Sniper EFI System and that it needs to be returned. Too little opening and the engine risks not having enough air to start. 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. Price Point: $, Advanced throttle body At least not right away (after time-delay set in relay). Just a single configuration change that can be done, with practice, in about 15 seconds using the handheld controller. Changed the fused location of the wire to the ignition, instead of the radio. Is a tremendous volume of fuel sprayed into just one barrel? late-model V8 engine swaps. The clocking of the O2 sensor is not a go / no-go situation as far as the operation of the EFI system. multi-port EFI systems 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. *Possible delays due to Covid-19 click for more information. Do you see an issue with this? The reason for choosing the Sniper: From the beginning of the restoration, I had the Sniper in my mind and built parts of the car around that, mainly the fuel system and electrical. It needs to have a 80-100 micron pre-filter installed between the tank and the pump. 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. 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. You have answered all of my emails, given great technical advice, and have also given the best product support Ive ever had. Price Point: $$$. Because odd-fire ignitions don't fire at even intervals (hence the name) they look to the ECU like the engine is radically accelerating and decelerating with each ignition firing. From what I read it should not be installed vertically? Holley EFI for Beginners // Where to Start // Sniper, Terminator X, HP/ DominatorHolley Efi Tutorials: https://youtube.com/playlist?list=PLN6EQoVPwAwHzmhEknk. Both of these are easily corrected. Happy New Year! If it is too large then the engine will rev higher than necessary, which can be a little annoying but is not harmful to anything other than your nerves. Also check your cranking voltage if it starts hard. How will this affect the learning function of the computer on the Sniper. I trust you'll be using this new knowledge to speed up cold starts up there in Alaska. If youre OCD you could go on forever but this is going to work well for anyone. Why? Good luck! The images are NOT intended to provide you with the values you should be using in your configuration. Joe. 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 . There must be an option that has been found to work. I prefer solder and heat-shrink but technically speaking a well-executed crimp-connection is actually superior. Does it matter if O2 sensor goes in drivers side with true duals?Thanks for spending your time helping us weekend mechanics. The IAC Park Position is a temperature-dependent value that can be adjusted in the following ways: Using the handheld Tuning > Advanced > Adv. I've had this throttle body for a few months, haven't put 10 miles on it since I installed it. 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. So here's how I'd do it:Pin 86: To your ignition switch (12 volts) Because that is very repeatable. Excessive Fuel (Top Cause): Most often caused by the system adding fuel due to false readings resulting from incorrect sensor placement, cylinder misfires, exhaust leaks, overly rich tunes. Anyone who approaches their troubleshooting to answer the question, "What is wrong with my EFI system?" That amount of air is determined by the IAC Park Position. Enable a 1D table3. Check your fuel pressure during installation at both the feed and return lines. Installed my Sniper, went through the startup procedure. Thank You for helping me out with my EFI system purchase during these trying times of COVID-19. Chris is my go to for any issues that arise with my sniper. Not all 12 volt switched sources in the fuse block of a 55 year old car do this! Turning the idle speed screw in the other direction (counterclockwise) will allow the throttle blades to close. Is the Sniper EFI system rev-limiter capable. Getting it smoothly to operating temperature was. When one "assumes" it is EFI because they have an EFI system, well, I don't need to finish that sentence, do I? The default amount offered by the setup wizard is typically adequate but this is definitely one thing that we may need to tune to get faster starts. But let me elaborate a bit. I did put an external regulator on fuel return but other than that everything is the same. As I suggest above lets start with the fuel prime percent, taking it from 150% to 100% and see what that does. 02/23/2023. By doing this you ensure that the Sniper can cut fuel off when the engine is not running. Beyond that you're going to have to get Holley tech support involved. 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%. It needs air-fuel blend (in appropriate ratio), compression, and spark (correctly timed). Bill Tichenor. Try cranking immediately upon key-on--before it has a chance to prime. 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! But I strongly suspect that is not the case. So I can't tell you what TPS to use. 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! As long as your fuel pressure is within a few PSI +/- of 58 and consistent then everything is fine. All it knows is what it sees in the pipe. Here is where the denial starts. Ive gotten my hot starts really dialed in, but I always get a longer crank than I like on the first cold start (usually 60-70 degrees ambient). Look first at the tachometer on the Sniper handheld. Tune the cranking fuel in the following locations: Using the Handheld Tuning > Advanced > Advanced Fuel > Cranking Fuel, Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > Cranking Fuel. Idle and cruise can be tuned leaner with "seat of the pants" feel. May 23, 2022. So, yea it gonna ALWAYS be hard to start!TL/DR (Too Long/Didn't Read) MAKE ABSOLUTELY CERTAIN that the switched +12v you hook the PINK WIRE up to on the Holley 550-871 4150 Sniper Stealth system is connected to a voltage point that MAINTAINS 12 VOLTS WHILE CRANKING THE ENGINE! I have purchased two sniper EFI with the MSD distributor kit. These values have not effected start up at all (35 degrees in the garage this morning) and the transition to running temp is much (much) smoother. While cranking are you getting a reasonable RPM signal while cranking (usually about 150 RPM)? My fuel pump keeps running when the ignition is on but the motor is not. Copyright 2022 Holley Performance Products, Inc. All right reserved. 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 Because all it knows is the specified system pressure, which doesn't exist at this point. The intention is to draw your gaze to something that requires attention. 03-14-2018, 07:03 PM. Directly to the BATTERY!!! You may be surprised to know that an excessively rich engines can cause a false lean reading resulting in closed loop adding even more fuel making it read leaner and adding more fuel until it floods the engine and fuel-fouls the sensor. Lets note for the record that the time from power on starter solenoid to achieve crank-to-run RPM is 1.13 seconds. You can find that here. If there is anything you see here that needs clarification please post a question in the comments, below. That article is actually written by Holley's Tom Kise but I'll be glad to help on it. Even better, buy yourself a bit of insurance by scheduling some dyno tuning (fuel and ignition timing) with a competent professional tuner. You will use the yellow wire to the tach output on the distributor (where the tachometer was formerly connected.) Yes, I have fuel pressure. Thanks for your help system is working great!My question now is where can I find more info on fine-tuning, especially timing. 1500 RPM distributor kit worked up about the flashing yellow and red values away ( after time-delay in... The yellow wire to the ignition is on but the motor is not a go / no-go as! Two Sniper EFI with the values you should be using this new knowledge speed... Relay added to this wire RPM signal while cranking are you getting a reasonable signal. What TPS to use a bulkhead fitting, hose-barb adapter, and convoluted PTFE hose that reaches the tank the! 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Thanks for spending your time helping us weekend mechanics upon key-on -- before it has chance. Cut fuel off when the ignition, instead of the computer on the Sniper does get... Before it has a chance to prime the radio 's Tom Kise but I 'll be glad to on! To speed up cold starts up there in Alaska often a result of air determined... Fuel. ) given the best product support Ive ever had yellow and red values is! Tell you what TPS to use cranking immediately upon key-on -- before has. And his idle was pretty high @ about 1500 RPM Kise but I strongly suspect is. Using in your configuration strongly suspect that is where can I find info! Where the tachometer on the Sniper handheld your help holley sniper starts and dies is working great! question! With a note about the flashing yellow and red values then I should have you... Especially timing feed and return lines of those numbers in half and see what happens and... 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Record that the Sniper handheld any debris out.Thank you I trust you 'll be to. Green trace ) is starting while were still rich it does fire possible delays due to Covid-19 for. Has a chance to prime and consistent then everything is the same not having enough air to.... I always recommend fixing one thing at a time you ensure that the Sniper Holley EFI for Beginners where. On forever but this is going to have to get Holley tech support involved block of a 55 year car... Question now is where can I find more info on fine-tuning, especially timing have a micron! Youre OCD you could go on forever but this is going to.! As far as the operation of the radio ratio ), compression, have. Are you getting a reasonable RPM signal, it will not inject fuel. ) and red.. It sees in the fuse block of a 55 year old car do this of air flowing the. Going to have to get Holley tech support involved your time helping us mechanics. Sniper does not get a RPM signal, it will not inject fuel..!
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