seems to be running rich at a idle. My setup requires too much pedal pressure both starting and running. The only Holley EFI system that supports dual O2 sensors at this time is the Dominator ECU. That's not the case here is it? The sniper master kits ship with OEM grade 255 LPH Walbro Pumps. I discuss idle setting procedures at some lenth here and you'll note that I never mention sound. 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. 4.56 rear gear and total weight is 2825 with me. Enable a 1D table3. Hi, I have a 1987 Firebird with 305 engine and Quadrajet carb. As this is quite a common known issue, does anyone know if Holley is replacing these free of charge? I have a 428 fe with a MSD Blaster 2 Ignition Coil, MSD Ignition Pro-Billet Ready-to-Run Distributor Ford FE, but that's all. So I can't tell you what TPS to use. But I'm confident that once you wire it this way you will not have the problem anymore. Connect the other line per Figure 2 or 3. If your O2 sensor is pegged lean, then replace it. During this time Holley also introduced SysteMAX engine kits that included matched cylinder heads, intakes and cams. It's a bolt-on replacement for a carburetor and the installation process is reportedly as easy as removing the carb, dropping on the throttle-body, and attaching a few wires. Hard to answer. Cheers Darren. So try cutting both of those numbers in half and see what happens. Beyond that you're going to have to get Holley tech support involved. I suspect this is the case in a huge number of "problematic" EFI installations where the system is getting the blame. Avoid using any 90 degree fittings between the tank and pump. If it does not idle down your throttle is open too far or you have a vacuum leak. Holley Sniper Fuel Pressure Problems - How to Fix Them Troy Kane Vtwins to v8s 9.88K subscribers 8.2K views 5 months ago UNITED STATES How solve fuel pressure problem on the Holley Sniper. I saw a video about this issue and he was able to resolve this issue by adjusting the manual set screw on the unit. Not to the fuse panel, starter solenoid or some random distribution stud/strip or other location. I just finished installing a Sniper stealth 4150 with an external pump supplied with the kit. In a nutshell, you do the following:1. Otherwise, two sensors could theoretically provide some benefit but only if something were going wrong on the engine. 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. #2 05-02-2019, 11:35 PM IF the Sniper's fuel pressure regulator won't regulate to the proper 58.5-60 psi (for whatever reason), you have the option to remove the FPR insert ( LINK - retain o-ring), and install a remote mounted FPR ( LINK ). 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've gone through all the steps and cannot seem to solve the problem. Thanks Chris for the quick reply, I have already installed a spacer, part # Aluminum Carburetor Spacers SUM-G141. It should not change. However, for individual requirements, it may be readjusted. Most of my driving will be with the exhaust going through the 2" exhaust and length of the exhaust after the O2 sensor wouldn't be an issue, but when I want to abuse the car and open the dumps, I won't have a location where I have 10 - 18" of exhaust tubing past the sensor. I have it disconnected to flush any debris out.Thank you. 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. [31] As of September 28, 2009, Holley filed for bankruptcy Chapter 11 protection. How will this affect the learning function of the computer on the Sniper. Only thing I have done since last Wednesday was add Holley EFI gauges. First, don't get too worked up about the flashing yellow and red values. EFI Systems based on Holley's world-class Dominator and HP ECU's. Yes, there should be a steady flow of fuel out of the return. :-) However, the self tuning feature may struggle with cams that have a lot of overlap. #1 I have a sniper 551-550, I dont understand how to took the brown wire (tach input). How did you install the return line to the tank? 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 regulator comes from Holley with the regulator pressure preset (see table). All you'd need to do is go into your configuration and change your Actual Fuel Pressure setting from the default 60 PSI to 55 PSI. Figure out what it's not getting and the find out why. Why? As Tom says above, it is best if the fuel is returned to the tank below the fuel line if possible. AEM EFI; Atomic EFI; . But let me elaborate a bit. Sniper EFI; Terminator X; HP EFI; Dominator EFI; Also in EFI - Fuel Injection. 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. The supply would remain at the rear inlet port. 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. Your assistance would be greatly appreciated. Use a corvette bypass filter/ regulator just outside of the tank to keep the return short and run only 1 high pressure line to the engine. You may have a pinched injector signal wire that has the injector on permanently. Similarly the fuel pump should be grounded directly to the battery using a wire of at least as heavy a gauge wire as the blue fuel pump power wire from the Sniper. I never changed any wiring just removed the sniper and installed the xflow. Help for our customers is just a phone call, test message, or email away. Then draw the power for the relay directly from the battery. Set the X Axis to RPM5. I believe that Ford uses a switching valve similar to the one one I designed into our Dual Tank Fuel System. Try cranking immediately upon key-on--before it has a chance to prime. The domestic aftermarket performance world has been abuzz about the latest low-cost EFI systems, one of which is Holley's new Sniper EFI. I've read that you can data log, my question is are there any professionals that can analyze the log and actually help write one for you that will help with the fine tuning. My fuel supply line comes from in-tank pump to to the regulator. You do have a fuel pressure gauge, right? 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The Sniper line of fuel pumps, regulators, and filters make Sniper a one-stop shop for a complete fuel system overhaul. "[20] In 1993 Coltec Industries Inc., of New York, closed the administrative offices at Warren, Michigan, and a warehouse at Goodlettsville, Tennessee. 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. They always perform and always make sure my purchase is right. You can run resistor or non resistor plugs with the 6AL box. From what I read it should not be installed vertically? I really would like to replace the intake gaskets. 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. How solve fuel pressure problem on the Holley Sniper System.Do you have high fuel pressure? But I have never heard of anyone else who has had success doing this. Can I lower it for this purpose? This is most easily done using the blue fuel pump wire. I know this is an old thread, but if someone could confirm for me that I can remove the internal FPR insert and run from that outlet port into an external regulator with a return line from the regulator to the fuel tank. Pin 30: To Battery I did not, but as I was checking flow at regulator side, it was a large steady flow of fuel coming from regulator. 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. Regulators; Regulators. Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. Run the switched 12-volt back as close to the ignition as possible. 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. DrEamer I suffer from cars on the brain! May God's grace bless you in the Lord Jesus Christ. Just recently installed the Xflow and my AFR is reading is 15 no matter what I do, engine is running ridiculously rich but the AFR is not changing at all is this an ECU problem or is there some things I can try doing before I pull it off and send it back to holley? I plan on converting to efi this coming spring. I have a aeromotive stealth 340 fuel tank. Is this normal? Black Ghost Hemi Challenger Street Racer Find a New Home. I'm just answering your question, and you're welcome. Check your fuel pressure during installation at both the feed and return lines. Another option is to mount the fuel pressure regulator at or near the rear of the Sniper. There is a 30-amp fuel pump relay built into the Sniper wiring harness so no additional relay is needed. Please read all the WARNINGS and NOTES, as they contain valuable information that can save you time and money. 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. Most current pump fuels boil around 130 degrees. #1 1978 Z/28 Veteran Member Jul 17, 2017 724 New Brunswick I am hoping some one can shed some light on the main difference the Holley sniper and stealth. New and used Fuel Pressure Regulators for sale in Charlestown, New Hampshire on Facebook Marketplace. I have a relatively restrictive 2 " exhaust after the headers, due to the through frame exhaust situation. Activate Advanced Tables2. EFI doesn't have feelings--it doesn't care what cam you use. Hi Chris,Thank you so much for your quick response to my query. Stay after it--you'll make it happen! But I suspect that's not the case here. Go Gators. Can I run the pink ignition wire to the coil positive? The resulting resistance can burn up fuel pumps, wiring and relays. My pump is a wahlbro 225 unit in the tank rated up to 100psi. In most cases this is at the fuse block but in a few it is at the ignition switch itself. I could do this with either tank set up. If you have any exhaust leaks between the combustion chamber and 18-24 after the sensor you are going to have problems. Im getting ready to instal a sniper master kit on a Ford 10.5 to 1 compression performer rpm intake comp cams 268/464 cam with everything else stock on unrebuilt 23,000 mile original engine with good compression and oil pressure. A throttle linkage extender and a progressive linkage kit. The fuel pump should turn off after 5 seconds until the motor is started. But as long as you keep a copy of your original configuration settings I think you will be okay. But I have MSD 6 AL. Does this mean it will have to learn all over again?
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