May God's grace bless you in the Lord Jesus Christ. Capability Range: Professional Run the switched 12-volt back as close to the ignition as possible. Any time you enable that input the new target AFR would take effect for as long as you keep the switch enabled. Copyright 2022 Holley Performance Products, Inc. All right reserved. Youve spent all this time wondering if this whole experiment in EFI was going to work and on the first start it cranks and runs beautifully. It seems to be going threw gas faster then it should. You'll note that the pressure drops at that point. I have an '89 Jeep 4.2L with a Sniper 2300 2BBL on it. Upon initial start-up the engine typically needs a bit more fuel than is provided by the fuel table. Designing a fuel system that can pick up fuel at all fill levels and with a nearly 90-degree angle on the tank is a challenge. When a wide band sensor is (DAMAGED) it almost always reads dead lean. The Ordering process was so easy and non-painful. 10-09-2018, 10:11 PM Installed my Sniper, went through the startup procedure. Can I get clarity please? *Possible delays due to Covid-19 click for more information. Holley did not include it on the Terminator X, which started life as a multi-point EFI ECU. Will the height of the return line be an issue? Thats what we want, right? I'm glad that worked for you! 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. So now youre left with tuning the Fuel Prime Multiplier. Question is, do I just plug what was the return at the throttle body? The car is 31 years old with only 13 500 miles on it. So I installed my O2 sensor vertically, straight up & down on top of exhaust pipe about 18" after collector. Capability Range: Advanced This is why most OEM EFI pumps are in the tank. It truly helps your customers like me that grew up as carburetor tuners understand how and what the EFI throttle body is doing. Once I got it close using your instruction, I was able to make micro adjustments while it was running to get the IAC to 1-2. If it dies add fuel right away thru the carb opening a few drops at a time if it runs its the fuel pump. The Del City Time Delay Relay is pinned just like a normal relay. I have a relatively restrictive 2 " exhaust after the headers, due to the through frame exhaust situation. You will use the yellow wire to the tach output on the distributor (where the tachometer was formerly connected.) This first data log shows a startup using the default settings on a Terminator X Stealth. EFI Systems based on Holley's world-class Dominator and HP ECU's. And that from a not-so-shabby original 1.13-second start time. 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? All of these values are configurable. Let me know what works for you! 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. If your pressure drops the system will react by adding fuel in closed loop and lean. So try cutting both of those numbers in half and see what happens. I figured it would be minimal. Sometimes it would catch itself, other times it would stumble and run out of breath. You accidentally wired the switched 12V to the accessory side of the ignition switch. Thanks. Regardless if you are using a Holley supplied pump or one from another source, electric fuel pumps are PUSHERS not pullers. My solution was to significantly reduce both the Coolant Temperature Enrichment and A/F Ratio Offset corrections. For this I recommend the HyperSpark Distributor. 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? There is really no room for error on this. The prime shot will still fire but since the fuel pump doesnt prime first it will deliver progressively less fuel each time. I won't buy anywhere else. If that works then try halving them again. The engine needs a certain amount of air during cranking in order to be able to start. This circuit shuts off during crank and will obviously cause problems. We do see a massive rich dip in the AFR as soon as engine starts. 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. The data log viewing feature is only found in the systems software so if youve not yet downloaded that then now is the time. I just finished installing a Sniper stealth 4150 with an external pump supplied with the kit. I have and will continue to recommend EFI System Pro due to your outstanding services and customer support. Did your engine start the first time you turned the key after installing your EFI system? You can adjust your Fuel Prime Multiplier on Sniper EFI Systems as follows: Using the Handheld Tuning > Basic > Basic Fuel > Fuel Prime > Fuel Prime Multiplier, Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > Fuel Prime Multiplier (under the Cranking Fuel tab in the box marked STARTUP SETTINGS). Not some generic pump as some have speculated. I think my tach is on there. I prefer solder and heat-shrink but technically speaking a well-executed crimp-connection is actually superior. And with each pulse of fuel until the pump starts again at the crank-to-run RPM, the pressure drops further. Hey Chris, I installed a Holley sniper on a small block 400, first start was great! New or not i have send dead item right off the shelf. If you free dumped it in the top, it will aerate and foam up the fuel. 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. EMI is what wipes out all the electronics. EFI sniper installed and dialed in perfectly as per directions, starts, stops, idles at 750-ish drives great. Then draw the power for the relay directly from the battery. 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. That article is actually written by Holley's Tom Kise but I'll be glad to help on it. I created logs in the past but never knew what I should be seeing and how to make the specific tweaks. i can hear the pump, but nothing is coming through the fuel line. I make a lot better electrician than mechanic but have built cars all my life. Upon achieving the crank-to-run RPM the cranking air is reduced in order for the engine to achieve the desired idle speed. 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?) But you can extend the leads using wires of an equal or heavier gauge. Another great dissertation. The images are NOT intended to provide you with the values you should be using in your configuration. From there it is a slam dunk. Any suggestions? Too little opening and the engine risks not having enough air to start. idles good, runs amazing. Everyone else was backordered several months. What we're primarily doing in this example is ensuring that we're tuning our start-up AFRs inside the range of common start-up AFRs. If so is there a way to connect to a standby auxiliary 12 volt battery to the Sniper to protect the information?Many thanks,Louis. Set the table type to Air/Fuel Ratio Offset4. 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've upgraded your engine significantly then you may need to upgrade your fuel pumps as well. 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. Price Point: $$$. After adjusting the manual setting on the unit, the TPS was @ 3 and his Idle was pretty high @ about 1500 rpm. It starts fairly well. (Only visible with throttle bodies that have the annular rings on top of the throttle plates.). By doing this you ensure that the Sniper can cut fuel off when the engine is not running. :-D. Just installed a 4500 sniper my fuel system maxes out @ 55 psi will that work or do I need new fuel pump ? Have a look at those. seems to be running rich at a idle. Before we move on to Fuel Prime Multiplier tuning, we should point out: Holley left the fuel prime multiplier off of Terminator X EFI Systems. But, even then, I would expect that the fuel management system will get fuel to and from the Sniper just fine. Anytime the built-in Sniper fuel pressure regulator is not used the return can simply be plugged. I suspect this is the case in a huge number of "problematic" EFI installations where the system is getting the blame. Do you see a very thin amount of fuel being injected evenly on all throttle plates? 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. 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. Bradley Iger. 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. We see a nice improvement in that big fuel dump as the engine starts running (between 3 and 4 second mark.) Super helpful and knowledgeable. Sure. multi-port EFI systems 4-hole spacers seem to work better than open spacers. That delay is called After-Start Holdoff. All seemed well with the setup and going through the handheld. Your thoughts?In your opinion, should I keep the factory cast iron intake or should I replace it with a more efficient one. The resulting resistance can burn up fuel pumps, wiring and relays. (Chris: If you bought it here then I should have provided you with my cell phone number. Thanks, Steve! Does it recover if you bump the throttle? I need to get an answer to the question concerning the TPS. My situation, although related to start up, is somewhat different. 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. To do rev limiter operations requires that the Sniper be controlling the ignition timing. If you jump in the car, insert the key and in the same move start cranking, you will not get a fuel prime. 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. my screen recording software i. Thanks! Price Point: $$, EFI Systems based on Holley's world-class Dominator and HP ECU's. My car idles beautifully @ about 800rpm. That's where I would start. 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. Confession: My TPS is split and works well. I have just finished installing my Holley Sniper to my 67 Camaro. None of your configuration settings will change as a result of being disconnected from power for any amount of time. It starts at 16 degrees (set for idle) goes to 23 degrees (set for cruising) and 32 degrees (set for WOT.) However, I went to turn my pick up on today and it wouldn't start, just turned over. Sometimes just moving a fitting or changing the length of a line is enough to confound the harmonic and make it go away. It does take some time looking at these data logs before they look like something more than the scribblings of a 2-year-old. Ordered a Golen stroker with Sniper and Hyperspark ignition to replace the 4.2 in my 89. Don't be that guy. If you are still getting more improvement as you drop below 100 percent then the better approach may be to drop your cranking fuel. 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 not then stop and buy one now. I'm all eyeballs! Thanks. The "Service AFTER the Sale" is why I came to EFI SYSTEM PRO, getting a system working with great support makes for a better installation and happy customers! I would also point out that these settings are easier to adjust using the Sniper Software than the handheld, though either will work.There are several settings that affect how quickly the idle returns to target. Since this is inadequate for starting the rest must come through the IAC port. Activate Advanced Tables2. You will begin to notice when the system is in closed or open loop, what the target and actual AFR are, and when it is running right or running rich. I was wondering if you could help out? I have a minor leak at the 02 sensor that I am fixing now because the gasket is leaking. 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. FE 390 that currently has a Pertronix distributor with the Ignitor 2 module. My question is if both of my fuel pumps are wired from relays to my rocker panel where does the blue fuel pump prime wire connect or would you just not use it altogether. This is most often a result of air flowing through the IAC port related to the IAC hold Position and is normal. Am i doing the right thing? 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. Now, at each RPM setting you'd add (or subtract) whatever from the Target AFR so that the new target is 14.0:1. My problem is that it starts and stalls instantly then acts flooded. Do as I Holley says? Cold cranking cant be tuned the same way because the engine will get progressively warmer as the engine is cranked, Prime shot can be enabled or disabled entirely and is calculated using two values: The Fuel Prime Percentage (Sniper and Terminator X), and the Fuel Prime Multiplier (Sniper only.) A tube type 90 is equal to adding 3 feet of fuel line between the tank and pump. Thank you for your insight! 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 Disable the tach sweep on your ignition box. That should be adequate to get the engine running. First, let me state clearly that the far and away majority of Sniper installations are done on dual plane manifolds, and that I have never heard of a single issue that has been tied to a dual plane manifold. 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. 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%. This is most easily done using the blue fuel pump wire. And 10 micron filter between the pump and throttle body. But you can take the same steps to adjust the temperature-dependent variables in the cold ranges when the engine is cold. Basically lean everything out by .5 and it should help a lot. Sure enough the pink wire DID NOT have voltage when cranking. Chris, I install a Holley Sniper Quadrajet on my 1976 GMC classic motor home with a 455 cu Oldsmobile. 2.) Is this normal? 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. I'm glad this approach worked for you. Avoid using any 90 degree fittings between the tank and pump. The Sniper has pre-programmed base calibrations that are a good starting point for most street drivable camshafts. (Plus, it's easy to do---see this article.) Holley Sniper EFI--Look, No ECU or Wiring Harness! 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. 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.) These settings will be instrumental to a fast start. 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. I feel I could then use the Startup Enrichment parameters (After Start Enrichment and Decay Rate) to fine tune from there. More on that later. Not all 12 volt switched sources in the fuse block of a 55 year old car do this! 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. Hello Chris. Lets go back to 100% fuel prime and turn cranking fuel down in that region by 30% and see how that affects us. You need a new fuel pump. And I've helped my share of folks with fuel pumps in empty gas tanks. Therefor, -40 + 100 degrees = 60 degrees. First, don't get too worked up about the flashing yellow and red values. I'm trying to get this article done. What do I need to do to rectify this issue? Sniper is working pretty well after using your idle setting procedures. Then he put his thumb back over the IAC port and there was very little air passing through the port and the loud sucking sound was gone. O2 Sensor Mounting: The O2 needs to be mounted 6-8 after the merge in the header collector.Holley states "If you have long tube headers, mount the sensor approximately 1-10 after the collector".I have a 454 with long tube headers, correct me if I'm wrong, but I was going to install my O2 sensor just past the collector bolt up but right at 10" past the 4 to 1 collection. 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 In most cases this is at the fuse block but in a few it is at the ignition switch itself. PIck a size that will not just lay flat inside your fuel cell but will actually run up the sides and back. Like I said my sniper unit is running just fine and the car has never run better. Even better, buy yourself a bit of insurance by scheduling some dyno tuning (fuel and ignition timing) with a competent professional tuner. Yes, there should be a steady flow of fuel out of the return. You may have a pinched injector signal wire that has the injector on permanently. It worked fine with carb, hope someone can help. Chris is my go to for any issues that arise with my sniper. Necessary to perform the start belowtherefore we are skipping Step one: tuning cranking air is reduced order... 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On a small block 400, first start was great helps your customers me... Not I have send dead item right off the shelf air is reduced in order to be threw., went through the startup Enrichment parameters ( after start Enrichment and A/F Ratio Offset corrections outstanding and. The values you should be seeing and how to make the specific holley sniper starts and dies... Annular rings on top of exhaust pipe about 18 '' after collector steady of. Certain amount of fuel being injected evenly on all throttle plates better electrician than mechanic have...