Next was to remove the plug in yhe bung on my Borla header for install of the O2 sensor. The oxygen sensor should be mounted at a point Installation of our Sniper Fuel Injection system is one of the simplest ways to upgrade and replace your carburetor with modern technology. This is the seventh unit I've installed and know there have been some bad sensors right off the bat with these. The Sniper EFI system looks at the closed-loop fuel compensation required to reach your target AFR. Top 10 Holley Sniper EFI Tech Tips, Holley Technical Training Manager's top ten "suggestions" for Holley Sniper EFI System installation issues. The learn function will offset the base fuel table until the closed-loop compensation only requires minimal changes. Your vehicle may already have an O2 sensor bung welded into the exhaust. I just purchased a Sniper EFI, and was worried about the location of the O2 sensor. 4 Injector Sniper EFI XFlow (550-540 Shiny, 550-541 Black, ... to www.holley.com for a database of technical information and online support. Discussion Starter • #1 • May 1, 2018. Read the Instructions, Check Your Wiring, Double-Check Your Ground, Triple-Check Your Ignition, Inspect Your O2 Sensor, Fuel Pump Location, Hard Starting Issues, Sniper EFI It’s economically priced so you can have all the benefits of EFI and still have money to finish or upgrade the rest of your ride! That work continues today through Holley’s market-leading EFI products as well as through Holley’s family of best-in-industry brands. - Fuel pressure has been verified at the Sniper EFI throttle body and is between 55 & 65 psi - All wiring has been tied away from potential hazards such as the exhaust, fans, pulleys, spark plug wires, 12 Volt accessory wires, the ignition coil and ignition coil wiring. Posts: 706 Not Ranked . Thanks - I’m glad to hear about this. Hi Guys. I have a Coupe, and the pipes go from 4-into-2, so I’ll be sampling from just 2 cylinders. Has anyone seen the WBO2 drivers fail in these Snipers yet? Location: Austin, TX. The kit comes with a clamp on adapter if you want to drill and clamp the sensor on, but I would have welded a bung in anyway. Pay specific attention to the O2 sensor cable lead. Holley just brought EFI within range - introducing Sniper EFI! Anyone have a good place to find a genuine Bosch O2 replacement sensor without paying $110? Cobra Make, Engine: ERA FIA, 351W. Perfect for street rods, muscle cars, off road trucks or nearly any carbureted vehicle. Luckily the header had one. I know from some of the other posts, there have been WBO2 sensor issues. This bung location needs to be verified before using it with the Oxygen sensor included in the Sniper EFI system. Holley part number 554-155. Locate a position for the oxygen sensor as close to the engine as possible. Put an end to cold start issues, hesitations, vapor lock, and flooding. I did soak the plug in pb blaster multiple times starting a week ahead. I have a Sniper EFI unit here that we installed for a customer and it has come back for WBO2 sensor issues. 25 Posts . Ideally the bung will be 6-10 inches after the collector for a true reading of all cylinders and have a minimum of 18” length past the sensor location. Im getting ready to switch to the Holley sniper EFI from the fox body system. I was worried that wouldn’t be enough, so I’m glad to know that yours is working well sampling just 1 cylinder. It is reliant on the data acquired by the included wideband oxygen sensor. Holley Sniper O2 sensor replacement.