I received my replacement TPS and O2 sensor. *Free Shipping & Handling only offered to the contiguous US on orders over $100, excludes clearance parts and oversized packages. Then dialed back the cranking fuel quite a bit and that seemed to help some, but still having ongoing issues. Why? Bolt on 4150 Flange Carburetor Replacement. 2023 HOLLEY PERFORMANCE PRODUCTS, INC. ALL RIGHTS RESERVED. watch the values in the software for the o2.. once is is done "Heating" and starts to show AFR, wrap the rag round it. If you call, they usually let you put in your name and they get back to you. 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'll also notice that the firing order is 1-6-5-4-3-2. I'm guessing by snail, that's another name for the riser? I had an injector fail after a month of running and called the tech line who helped me figure that out. The reason I say this is that nowhere in this discussion is the fact that none of these systems are are handling the timing on the fly. Are you running the latest software? I am concerned about the O2 sensor consideration, but in the end isn't the carburetor situation open loop? excessively rich mixtures), Mechanical shock (e.g. While the Sniper has an absolutely outstanding internal ECU, the current model does not offer any laptop programmability. John 1:5, 1969 FJ40 2F with Holley Sniper EFI, Power Disk Brakes Front & Rear, Downey, Your post has peaked my curiosity. I will be calling around to see if I can find someone to help that has experience. Brand: Holley EFI Emission Code: 5: Material: . 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. You will need an O2 sensor to measure fuel needs, but it could be tuned manually like in the old days. So far so good. I only have a stick welder and didn't trust myself on the thin pipe so I brazed it in. An update from Al:After installing them I used the auto tune program on the Holly HP V4 software and they are working great. Well an update on the Sniper install. Price Point: $$, EFI Systems based on Holley's world-class Dominator and HP ECU's. Pink switched power wire, this needs to be connected to a point that is 12V in run and while cranking. Joe, where did you end up installing the o2 sensor on your setup? Went with around .525 lift, 270 duration on a 114 LSA and the car was sucking vacuum like a new hoover. Marc, you don't mention which system you installed but the Holley systems are fully configurable. Note that this is a different sensor than Holley uses for their Dominator/HP/Terminator/Avenger series. I've seen O2 sensors in water jacketed headers that have worked fine for years. Q2. They have mods that help. Holley Oxygen Sensor O2 Bung Weld-In Style; Larger Image. Had to replace the oxygen sensor on my car for the terminator x after the original one failed and this fixed all my problems. For a better experience, please enable JavaScript in your browser before proceeding. Everything about the fuel prime shot can be adjusted. This completes the basic installation of the Holley Sniper EFI 4150 Super Sniper 1250/650 kit. I want to remove the old fuel injected Mercruiser factory EFI on both engines because they have begun to be troublesome. Running? The truck started fine after install, and ran down the road ok. Use a return fuel line. If a cruiser with enclosed engine compartment, not a lot you can do to eliminate water or at least water vapor in the exhaust. . 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. This doesn't apply to race boats. O2 Sensor Mounting: The O2 needs to be mounted 6-8" after the merge in the header collector. Super helpful and knowledgeable. Capability Range: Moderate Have to replace head gasket. Wherever you go, the cultural kaleidoscope of Taipei showcases exhilarating diversity. This page was generated at 08:35 AM. The Holley Super Sniper High Performance EFI kit comes with a coolant temperature sensor and an O2 sensor, both of which must be used for the EFI to work properly. The spark must be manually tuned. I'm having new headers with an O2 sensor bung installed in my car ('79 Vette) soon, to prepare for a Holley Sniper EFI TBI install this winter. : For registered members this ad will NOT show. 02/25/2020. you don't want to read that loss. Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. https://www.efisystempro.com/efi-pro-hangout/sniper-installation-tips-holley-tom-kise, https://www.efisystempro.com/efi-prng-engine-startup-sniper-terminator-x-stealth. Capability Range: Moderate Part# 550-511. Replacement Sniper and Terminator X O2 Sensor. 10 min read. Anyone ever converted a 1987 3.7L 4cyl Mercruiser engine to EFI. 2023 Holley Performance Products, Inc. All Rights Reserved. The engine floods and it is embarrassing when leaving a lock. I am a competent mechanic and I have checked all the usual suspect items. In the event you decided earlier that you are going with the Sniper EFI System you will not have the requisite tuning capability by simply using the included handheld tuner. 534-199. 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! In Stock. If the indicator reads "LOW Err" double check the connection to the CTS. Free ground shipping regardless of order size! FWIW, I called Holley to confirm the part number and they say the Bosch part number if 17212 (also available on Amazon for $64.78). Most water jacketed header manufacturers (Lightning, CMI, etc) will install 02 bungs in their headers for extra money. 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. $119.95. so far so good love the smooth power and easy starts. I installed a holley sniper kit. Emissions. Anybody got a good 270hp 350 tune yet?I installed sniper efi on my boat runs good but feel like the wot should be better need to get the sniper controlling spark is my thoughts the old thunderbolt is either not great or timing wasn't right when I bought the boat but she runs great I just think this engine has more in it then I'm getting out of it at this time any tuning and timing advice would be great considering I'm awesome with carb n hei diet but new to efi and boat timing curve but not an idiot so I say. test the sensor.. for a basic pass/fail of the sensor. I will change and be using an in-tank pump when I install the new 120 gallon tank this winter. The Sniper EFI throttle-body drops in place of your . *Possible delays due to Covid-19 click for more information. Sniper EFI Quadrajet Marine. By Joshua C on August 10, 2021 | Verified Owner, Worked right out of the box. Bolt-on carburetor style EFI for your classic car or truck. Racing Use Only Vehicles are vehicles that are used exclusively for competition that are not registered and that may never be used on the street. Top 10 Holley Sniper EFI Tech Tips Holley Technical Training Manager Tom Kise's top ten "suggestions" for Holley Sniper EFI System installation issues. Master ASE tech since 91. *Free Shipping & Handling only offered to the contiguous US on orders over $100, excludes clearance parts and oversized packages. Since the Sniper install, I encountered my second O2 sensor failure so I thought I would try the "Innovate Bung Extender" recommended by a few folks here. I have also installed a sniper system on a 350 Mercruiser and was wondering if you have done any tuning on yours yet? I had questions on the suggested "Marine O2 Sensor Adapter" from Howell EFI (https://howellefi.com/product/adaptor-o2-sensor-for-marine-use/), but when I look to the pictures, I understand how it will work. Good luck to all. It appears that its a tuning issue. Comes VERY complete.throttle cable bracket, kickdown bracket, base plate studs & nuts, heat shrink type connectors, and pretty decent instructions as well. The original Holley Sniper instructions are available on the Holley website if you have misplaced them. As far as warranty goes, Holley products are covered by a 90-day warranty against defect in material or workmanship. If you let it cool down again, does it start up fine? Add to Cart . Top 10 Holley Sniper EFI Tech Tips Holley Technical Training Manager Tom Kise's top ten "suggestions" for Holley Sniper EFI System installation issues. 29. away. I would send an Email to Chris at EFIsystempro. I have a 74 bronco, 302, mild cam. Do you also recognize that the O2 sensor that is required for closed-loop operation will not survive in the "wet" manifold used by most marine engines, and that to install a device to protect the O2 sensor from this moisture may require the removal, machining, and replacement of the exhaust manifold? May 19, 2021. looking at doing the same. It turns out that this is a common problem with the Sniper EFI install on vehicles with a manual transmission. Using the correct length carb stud and nuts, tighten the Sniper EFI throttle body down progressively in a "criss-cross" pattern (60-80 in.lbs.). This requires removing the plug with a breaker bar, and using a 1/2 NPT to 3/8 NPT adapter to mount the Sniper sensor. I also capped off the regulated return line with a hose, clamps, and chamfering bit. 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. ), https://www.ebay.com/sch/i.html?_froensor&_sacat=0, https://www.amazon.com/Bosch-Automot1296929&sr=8-3, https://www.efisystempro.com/wbo2-seer-tbi-554-155, https://forums.holley.com/showthread2927#post82927. 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. The first thing to consider here (if you are in the USA) is US Coast Guard (USCG) Safety Approval. The O2 sensor burned out immediately. If you have long tube headers, mount the sensor approximately 6-10" after the collector. Wideband Oxygen Sensor Extension Cable. Add to Cart . The light shines in the darkness, and the darkness has not overcome it. The Holley Sniper system sells for $999.95, installs in under 2 hours, and requires only an O2 sensor, a temp sensor (both included), an electric return-style fuel pump, and four-wires to connect.. Quote Reply Topic: Holley Sniper Posted: Jan/05/2022 at 2:01pm . I installed one also on mercruiser 260 hp. These often don't work with stock ECUs, so your best bet is to weld in a second bung for the wideband sensor. Increasing efficiency is always a good idea. From there, our highly trained factory refurbish technicians flow the original fuel injectors. . I've been building a TBI system from GM parts to use on a 1987 Wellcraft with the Mercruiser 4 cylinder engine. OT pipes may be out of the question, but with the water dumps put in at the transom, ala Gil or Rewarder OT pipes, you could get dry readings with bungs a little above where they bolt onto the logs, I would think. Spray a rag down pretty good with brake cleaner. Staff Writer. Add to Cart . Otherwise I have to check for a place in my gasoline tank to put the lines in. $132.95. Thanks for the feedback on this adapter, Donald. Part# 554-155. Part # 554-155. I have a local customer with a pair of big blocks in his offshore boat that is eager to get started on this. The problem is with the Holley computer when you turn on the keyit squirts a prime for a split second. Holley has a pump almost identical in size to the OEM pump and it's not difficult to change. AFR was 19 area. On a side note: Im getting 4200 rpms at 5000 elevation with stock heads. Sniper throttle body linkage opens all four barrels evenly when you depress the throttle. There are five significant plug connections to make from the throttle body: Plug into the oxygen sensor.