running holley sniper without o2 sensor

I want to register an account for free right now! Top 10 Holley Sniper EFI Tech Tips Holley Technical Training Manager Tom Kise's top ten "suggestions" for Holley Sniper EFI System installation issues. This motor would probably turn the berk to 6 grand and blow it out from a stop.Motor dyno'd on a carb @389 hp @ 4700rpm and 497 tq @3500. The boat underway acts very much like a water brake dyno I strongly believe that a well broken in engine in good condition can stand a much more critical tune w/o issues and deliver almost the same fuel economy as the proposed EFI conversion. O2 sensor placement is critical for getting your engine to read the oxygen in the exhaust correctly and can directly impact the performance of your new EFI installation. Can more detail be provided? The O2 sensor burned out immediately. The right side o2 was obviously reporting a fat 10.3 afr as a result, but the car still went 139mph, LOL. You are using an out of date browser. If you have any exhaust leaks between the combustion chamber and 18-24" after the sensor you are going to have problems. Not sure how well the sensor likes being that close to the port. It may not be enough to cause problems with the way the engine runs aor even make into the cylinders, but it is enough of a mist to take out a O2 sensor. Customer Rating: 4.3 out of 5 stars: 4.5 out of 5 stars: In Stock. THen you have to determine if you want 02 readings from one cylinder, or in the case you just mentioned mostly one cylinder, average of 4 cylinders on one bank or the other, or average of all 8 cylinders. I have a boat with twin 3.7 Mercruisers. To those who have installed the Sniper EFI units, please post up some photos of where you tapped the exhaust line to install the Oxygen Sensor's weld bung. . From there, the idea is that it will self-tune to the requirements of the engine. Use a return fuel line. Howell indicates that this adapter was designed for the Chevy type Mercruiser manifold but that it should work on any similar marine wet manifold. When it did keep running, the headers all started to smoke. Do you recommend in-tank or external fuel pump? The Sniper EFI throttle-body drops in place of your . Do you offer a USCG fuel pump kit? You can selectively provide your consent below to allow such third party embeds. You should then have at least 18-24" of pipe after the sensor. Price Point: $$, Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. Boats don't cruise at 60mph up and down hills. watch the values in the software for the o2.. once is is done "Heating" and starts to show AFR, wrap the rag round it. looking at doing the same. Sniper throttle body linkage opens all four barrels evenly when you depress the throttle. By Joshua C on August 10, 2021 | Verified Owner, Worked right out of the box. pull the sensor out of the exhaust. I've seen O2 sensors in water jacketed headers that have worked fine for years. It appears that its a tuning issue. - The sales brochure refers to Integrated Ignition Timing Control and Coil Driver. Full time feedback from the sensor is what the computer uses to refine the fuel table. Or maybe I could just use a piece of spare/junk exhaust tubing, and bolt it to the manifolds and add a weldless O2 bung to it. Don't know about HP increase, with the QFT 750 it would turn a 212/4.0 combo to about 3950 to 4000, the Sniper turns it to 4000 to 4100. Even if you are the sort to sort of shrug off safety regulation, consider that if there is an accident that results in a loss and an investigation, failure to follow applicable USCG regulation could result in either financial or legal liability, not to mention the rejection of insurance claims. Oxygen (O2) Sensor - Is an electronic device that measures the proportion of oxygen (O2) in the exhaust gas. To take advantage of all the site features, please take a moment to register. Mike. It looks like another season has come and passed by without the answer you wanted on this.I am impressed that you made the leap into marine fuel injection but you have experienced the same problem that everyone else who has tried this has faced. *Possible delays due to Covid-19 click for more information. Let me know how I can be of assistance. 10 min read Video. Price Point: $$, Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. (Image/Wayne Scraba) The throttle body is a bolt-on replacement for a carburetor. #1. We use cookies to enhance your experience while using our website. Marc, you don't mention which system you installed but the Holley systems are fully configurable. Aug 17, 2013. Did a test startup on my new sniper by running the power wire to battery + and not using the o2 sensor.I also capped off the regulated return line with a hos. I recommend popping for the Master . I will be calling around to see if I can find someone to help that has experience. so simple check first, whats the fuel pressure? Holley EFI Oxygen Sensor. I've installed several of these adaptive EFI's on cars with great success. Followed all the instructions to the letter. If you are using our Services via a browser you can restrict, block or remove cookies through your web browser settings. Thanks. Plug-And-Play Compatible with Holley Sniper EFI System, Only for applications that use a Bosch LSU 4.9 0 258 017 025 (17025) Wideband O2 Sensor, Particulates, carbon (e.g. $119.95. 02/25/2020. Newer ECMs have all the options to configure these functions. I have searched thru the forum as much as I can, with not much luck. My boat is still in winter storage. I bought a new holley sniper , dual sync dist., coil, and holley in tank fuel pump, When engine got hot it would go crazy. May God's grace bless you in the Lord Jesus Christ. I thought the clamp on style mount was a good idea in case the threads got buggered up when a sensor change might occur, and the threads are rusted up by then. I didn't read all this, but yes, the EFI system can be run without a WBO2 sensor. Copyright 2017 Cyberspace Automotive Performance, Inc. All Rights Reserved. A replacement clamp on would be an easy change out. I stopped by Bergeron on my way back to the lake, and he said they have never found a good way to run O2 sensors in a marine exhaust. I will get a new 02 sensor before I swap back to the orange box. Phil said water would still get up over the snail and knock out the sensor. The in tank pump is quieter, will normally run cooler and should last longer. It does this every time..when you start a warmed up engine, its too rich and starts poorly without throttle. One of the most common causes of poor idle is improper O2 sensor placement or trying to run closed loop at idle . There are five significant plug connections to make from the throttle body: Plug into the oxygen sensor. : For registered members this ad will NOT show. It could be an instant fix. . The problem is with the Holley computer when you turn on the keyit squirts a prime for a split second. Removed all the unused wires from harness and wrapped all the remaining wires and harness with rfi shielding tape. My hand is holding the connector to the sensor. Everything about the fuel prime shot can be adjusted. Sensors: Fitting: Threaded O2 . The Sniper EFI throttle-body drops in place of your . Was in marine engineering for years. 10 min read. p.s. Part # HM206. 5. Without the engine running, AFR will read 35.6 The fuel pump will run off a relay in the sniper harness (blue wire) pink wire gets switch/run power to the relay. 2. Fine tuned the timing to 12-15 degrees. This is made by Innovate, the guy that runs the Holley EFI forum HIGHLY recomends AND uses them himself, I use them, my o2 on my wideband Innovate, kept going bad, a 4.2 Bosch o2, put this on both my Holley HP NTK sensor & the wide band, been 2 years now & lots of driving, all good, Heat-Sink Bung Extender (HBX-1) - P/N: 37290 The right side o2 was obviously reporting a fat 10.3 afr as a result, but the car still went 139mph, LOL. Here's the pic of the location with my header. Part# 550-511. YES! "Old Yeller" gets Holley EFI Sniper O2 Sensor Installedhttps://www.holley.com/products/fuel_systems/fuel_injection/sniper_efi/sniper_efi_stealth_4150/sniper_. Posted By : / actual instructions in flowcharting are represented in /; Under :nose exercise before and afternose exercise before and after Free ground shipping regardless of order size! I am interested in upgrading both engines with Pertronix Ignitor or Ignitor II ignition and the Holley Sniper EFI 2300 and the Howell EFI marine O2 sensor adapter. Only show this user. It's a compact HP pump and cooler assembly. I installed a Holley sniper system on my car and I've been fighting it for 2 weeks now. Yes, this is an old thread, but it's an old unit. I have searched thru the forum as much as I can, with not much luck. Having selecting USCG-approved components, and sourced your O2 sensor adapter, there is but one more challenge--tuning. The following vehicles are considered Racing Use Only Vehicles: Holley is the new standard in EFI! Taipei has dozens of world-class restaurants where gourmets can sample the most authentic Chinese cuisines. If this is a first time effort, find a tuner in your area with marine experience. Search for O2 Hotel Taipei Main Station discounts in Taipei City with KAYAK. functioning controller during engine operation. Holley 554-100 NTK Wideband Oxygen Sensor. Replacement Sniper and Terminator X O2 Sensor, This part is legal for sale or use on Racing Use Only Vehicles. Did you use the Holley fuel pump and have you had any issues with it? It does not work with the Sniper EFI oxygen sensor. Powering the Sniper, There are three wires that need to be connected to power on the Sniper, Red and Black main power wires, these need to be run directly to the battery and have a solid connection. My tune is coincidentally set at 11.5 desired afr, with the failed side as the leanest bank, but the ecu added 15% fuel anyways. It will not fit on round or oval risers without a suitable flat area. Free ground shipping regardless of order size! Wideband Oxygen Sensor Extension Cable. I'll let you know how it works out. Previously, none of Holley's throttle body injection (TBI) systems, such as the Terminator EFI were USCG approved (even though the HP and Dominaor ECU's themselves are.) I have about 30 hrs on the unit and it just keeps getting smoother with every hr of run time. But you still risk a little water running back at low Rs. Holley sniper issue on newly rebuilt motor, Holley Sniper with Duraspark and timing control. Q2. You must log in or register to reply here. Holley sent him a new one for free. This was for MPFI. Essentially, when I push the clutch in and ease on the brakes to coast up to a stop light, the AFR goes lean (18:1 or so) and the engine stalls. What I installed on the motors was the Holley HP 19lb Holley Injectors the Holley 522-198 duel sync distributors with the MSD Digital 6A and the MSD Blaster 2 coils. 4. For this you need a system that can be fully programmed to the extent of the Holley ECU's capability. Once the tune is complete, the O2 sensor can be defeated or . It flows 850 cfm and can support up to 650 horsepower. Find a lower price anywhere and we'll beat it by 5%! Was told by holley tech support to make adjustments to the fuel prime percent and multiplier settings, played with those with no major improvement. The new Exhaust manifolds will have wideband O2 bungs for tuning. I do believe that the Holley EFI ECU's have the capability to be programmed to work in this application, but have not yet found anyone who has tackled this task and been fully successful.If you (or anyone else) does make some progress on this, please reply here and let us know what works. Because the fuel maps are built on a speed-density (ie, engine RPM versus manifold air pressure) fueling strategy. I want to remove the old fuel injected Mercruiser factory EFI on both engines because they have begun to be troublesome. What Is Pinion Offset, And How Does That Affect You? Brass adaptor designed to install heated oxygen sensor in water-cooled marine exhaust risers. Are you holding your RPMs back with the MSD for some reason? 92 YJ 4.0, AX-15 5spd, np231, dana 30 front, dana 35 rear. Pricing was reasonable, shipping was prompt and Chris helped me with a wiring question during my install. Anti-Seize pre-applied to sensor threads. George Place the Sniper EFI throttle body on top of the new flange gasket on the manifold. A third option would be to run your EFI system without an O2 sensor at all. Have engine apart and head checked and cleaned at machine shop. It only runs rich on start up for a second due to the prime, after start it runs great. Let him re-jet the carb (a wee bit on the fat side for safety) and reset the timing and try again. Ive got a set of bassett headers for a BBC, ill see if they can fit under the transom. If you're not running one (or if you are and the water has killed it) then it is not surprising that you are running rich. Capability Range: Advanced You'll also notice that the firing order is 1-6-5-4-3-2. I was mocking it up at the time. I hope that the next F/2F header is more O2 sensor friendly. The adapter will be fastened in both metal parts so that no water will reach the O2 sensor. Why? Had to replace the oxygen sensor on my car for the terminator x after the original one failed and this fixed all my problems. Held finger over IAC and it ran better, the thing was just wide open all the time and had nothing to suck. Here is one on start up tuning. If you're thinking that you've read everything above and are ready to toss the carb on your marine engine then take this handy quiz to make sure! But MAP sensors are very easy to physically implement and are inexpensive. the motor has the following mods, Aluminum heads, Performer intake, Sniper and MSD ignition module. Please consult the Holley Sniper full manual and use this guide for supplemental clarification. Sniper EFI 4500 Marine. http://s621.photobucket.com/albums/tt291/Mark11530/?action=view¤t=MAH05771.mp4, http://www.holley.com/data/Products/Technical/199R10226.pdf. The light shines in the darkness, and the darkness has not overcome it. I've been building a TBI system from GM parts to use on a 1987 Wellcraft with the Mercruiser 4 cylinder engine. Some parts are not legal for use in California or other states with similar regulations. excessively rich mixtures), Mechanical shock (e.g. No worse than taking the reading in the intake manifold cross over. OP, the Edelbrock system looks to use the same basic sensors as the Holley sniper system: TPS, MAP and O2, plus a few supporting sensors. you don't want to read that loss. It is possible for the ECU to have an internal failure that can kill O2 sensors. Part# 554-155. holley efi. I thought about adding some sort of extra protection but never did. Capability Range: Advanced I am in the middle of a repower of twin BBC 481, mild cam which will need to be recarbureted. I have a 74 bronco, 302, mild cam. Never tried it myself or know anyone fwho has, but Little kids play hooky . big kids play. Does an yone have a pic of the O2 sensor in their exhaust? From time to time we receive phone calls from individuals who are interested in converting their carbureted boat motor to fuel injection. Pay close attention to the instructions on O2 sensor placement. CUSTOM ART FOR CUSTOM NEEDS. Good luck to all. An O2 sensor is used when converting an engine to fuel injection and wanting to move from an "open loop" system to a "closed loop" system. If there's anyone willing to read a bit and offer advice about what to do when doing a top-end swap (when you may be in a scenario with a new top-end that's the EFI isn't calibrated for AND you can't have an WBO2 sensor connected), please let me know. Oops, after that it cranked right up.Idle was set to 950rpm so after the vid was cut off I lowered it to 820rpm and it was purring like a kitten.EFI for dummies. I have searched thru the forum as much as I can, with not much luck. Next, the new unit was installed onto the manifold. Wideband Oxygen Sensor Extension Cable. Hopefully this one lasts longer than the original. Sniper EFI 4bbl Marine. Runs like a champ now. Yellow Init In First shown for an instant when the system is powered on. The problem occurs when an excessive amount of oxygen makes its way from the intake port directly into the exhaust at idle and low engine speeds because of overlap. They have mods that help. JavaScript is disabled. In a horizontal or if pointed upwards it can collect exhaust condensation liquids upon start up. It's hallmark is its simplicity--but in this case it is also it's shortcoming. Anything else is going to be a frustrating recipe for for failure. My tune is coincidentally set at 11.5 desired afr, with the failed side as the leanest bank, but the ecu added 15% fuel anyways. When I went to Holley HP, I found an adapter by Innovate that is designed to draw air out the exhaust stream and away to the O2 sensor. This boat has a non-vortech motor with a 2 bbl gm intake i'll need to replace. Great Article. Installed a Lokar throttle linkage bracket custom made for the Sniper, removing the old one that had been on my Holley 750. Your talking flames at that point, and it will definitely have an effect on the reading. It will flood itself out and won't start back, just crank and crank. http://forums.holley.com/showthread.ension-Harness, http://forums.holley.com/showthread.4388#post54388, If this is your first visit, be sure to There are drawbacks to that (as your tuner can explain in more detail) but it is doable, provided the system is correctly tuned initially. Tips on how to measure the correct location and other considerations when welding in an O2 sensor bung. so mine has been pretty good but 1 out 20 starts you can hear the fuel pump run longer then normal..when it does that it will light off then diebut if i put my foot to the floor it will start..still working on that 1..timing i am running 12 cranking.20 idle.40 cruze.35 wotstill playing with all of this..Mine is also a sniper stealth. Having the same problem with my sniper as well, intermittent hot (and cold) start issues. Q1. The Sniper EFI could very well be one of the easiest to set-up fuel injections systems ever. If you call, they usually let you put in your name and they get back to you. The first option is to just buy the injector body and the controller with the wiring harness and sensors. Holley EFI has the solutions you need to get your project up and running better than ever! Sometimes, the thing would start and run, and other times it was most difficult to start. dropping a sensor on the ground), Extreme exhaust temperatures (Greater than 930 degC/1700 degF), Unheated sensor in exhaust stream. . Holley EFI has the solutions you need to get your project up and running better than ever! Replaced O2 sensor but continued to have AFR issues running too rich. For a better experience, please enable JavaScript in your browser before proceeding. If I am reading your post correctly you are using two separate o2 sensors when using headers ? Followed all the instructions to the letter. Most water jacketed header manufacturers (Lightning, CMI, etc) will install 02 bungs in their headers for extra money. Homemade body parts replace the originals as they rot away but it's a 40 on the inside. The sniper fit perfectly on the intake. Holley Sniper Installation Supplement Please note, a Holley Sniper instruction manual, as well as some small parts that come with the . Follow USCG rules about materials and fittings. Initial Calibration in Basic Configuration. Pink switched power wire, this needs to be connected to a point that is 12V in run and while cranking. Without Headers Steamers location (above) is perfect, up close to the engine where you have not lost much heat. Has been since the 80's. Ordered another dominator Bosch from Holley and it matches perfect. Sponsored Links (REGISTERED USERS DO NOT SEE THIS POST/AD! Sort. Tech Resources. While these base maps are generally quite good for cars they are going to be pretty far off in the case of marine applications. - You are currently viewing the forums as a GUEST. Given the traditionally poor fuel economy of carbureted marine engines, we feel your pain. Then turn the engine off and "lock in" the tune in a non-feedback loop mode, and quickly remove the headers and wash them off to prevent damage and then swap to the manifolds, but that would honestly be a huge PITA. Replacement Bosch Wideband Oxygen sensor for Sniper EFI and Terminator X systems. Throttle body mounted ECU - no extra boxes to mount. I installed the adapter and elbow so it's at an angle above the entry point. But it is going to be a little tricky. Without Headers Steamers location (above) is perfect, up close to the engine where you . (Assuming it actually releases in November and there are enough units for me to purchase and receive one in December). I have not yet got it figured out. EFI EFI kit electronic fuel injection. Add To Cart. I had the pink ecu signal wire connected to a bullet connector on the passenger side . For a better experience, please enable JavaScript in your browser before proceeding. holley sniper efi Holley Sniper EFI Self-Tuning Master Kit - Black Ceramic Finish $1,475.95 Part# 550-511K holley efi 100 PSI Stainless Pressure Sensor $155.95 Part# 554-102 Are you waiting to convert your carbureted vehicle to Sniper EFI, but don't like the idea of mounting an external fuel pump? Jan 20, 2019. Yellow Cold! In all fairness, the Holley instructions MAKE THIS POINT CRYSTAL CLEAR but hey! Make sure to put anti seize on the threads. 2014 FJ Cruiser - White - 4X4 - Loaded - . Bosch 17025 Oxygen Sensor #1 Best Seller . Innovate Motorsports HBX-1 Bung Extender. All sensors are tested to ensure they accurately report critical engine data to the . Other? I don't have enough experience with marine applications to know exactly what it will take to solve this. USCG approval is certainly worth careful consideration, as being on a boat that catches on fire is even more serious than being in a car that catches on fire. Staff Writer. Air-Fuel Ratio (AFR) - The most common reference term used for mixtures in internal combustion engines. The Tech Tips and discussions are also great! Bolt-on carburetor style EFI for your classic car or truck. While the Sniper has an absolutely outstanding internal ECU, the current model does not offer any laptop programmability. Whether you're engine swapping your classic car or need to manage 4000 horsepower in your twin-turbocharged drag radial race car, Holley EFI has the solutions you need to get your project up and running better than ever! Emissions. These often don't work with stock ECUs, so your best bet is to weld in a second bung for the wideband sensor. All of the wiring begins at the throttle body and connects outward from there. Sensors that are installed in an exhaust must be connected to a properly It may not display this or other websites correctly. If a cruiser with enclosed engine compartment, not a lot you can do to eliminate water or at least water vapor in the exhaust. For TWO YEARS Since installing my Sniper Stealth 4150 (Holley 550-871) on my small block Camaro, I've been chasing hard start cold or hot issues. Everything is included to completely plumb your fuel system including; 20 feet of 3/8" EFI Hose, in-line fuel pump, post and pre fuel filters, return bulkhead, and all of the necessary fittings and hardware. This completes the basic installation of the Holley Sniper EFI 4150 Super Sniper 1250/650 kit. Good luck! I would send an Email to Chris at EFIsystempro. 02 sensors are very heat sensitive, and can detect an exhaust pulsation in a single Header tube, that's why we always wanted to position the sensor into at least 2 opposite firing tubes we running Headers. May 19, 2021. Precisely Adam. For complete information about the cookies we use, data we collect and how we process them, please check our, actual instructions in flowcharting are represented in, Why Is Dave Blankenship Not On Oak Island Season 8, rhode island groundwater classification map. Have you visually verified that all your injectors are spraying? Brass adaptor designed to install heated oxygen sensor in water-cooled marine exhaust risers. As always, your results may vary and batteries not included. So much it could be. In order to do this, it heavily relies on proper O2 sensor placement. Shop Oxygen Sensors at Summit Racing. This fixed the high throttle position sensor reading (TPS) of above 1% that likely caused my idle issues. I would prefer to run this brand new Holley EFI system in a closed loop, not set the fuel map, and use the O2 sensor as only a sensor. EFI Systems based on Holley's world-class Dominator and HP ECU's. It turns out that the loading generated a propeller in the water is significantly different than wheels on pavement, so much so that the map has to be tuned differently. #3. I mounted it here attempting to protect it from the deep water I play in and from lots of branches I encounter. Then if you are do you just wire the o2 sensors in parallel or do these EFI kits have inputs for more than one sensor. JavaScript is disabled. I just installed a Sniper on a 67 GTO and it was pretty straightforward, the end result was a much better starting/smother running car, than can adapt to elevation changes better, But we also installed the Holley Dual sync distributor for a complete system that adjusts timing as well. #1. away. Greatest struggle is the shift interrupt. I will keep the in-line pump for a spare. Holley Sniper - Oxygen Sensor Location Thread starter GA Architect; . (If I am incorrect I heartily invite your comment at the bottom of this article!) Price Point: $$, EFI Systems based on Holley's world-class Dominator and HP ECU's. The spark must be manually tuned. test the sensor.. for a basic pass/fail of the sensor. Now the lower cost Holley Sniper advertised for March 31 2016. I am considering the Daytona Sensors Ignition module. Categories. My first install was on a stock manifold and I installed it in about the same spot Steamer (above) did, except 180 degrees the other way, facing towards the front of the vehicle.