If disconnecting AIR pump, check with local ordinances for the legality of this procedure in your area. There are five significant plug connections to make from the throttle body: Plug into the oxygen sensor. The Super Sniper installs just as easily as the regular Sniper, with wiring connections for power, ground, fuel pump, and switched power. So if exhaust sample is eratic. It’s the key for self-learning. First sensor I ordered myself, was wrong...Bosch 17014 does fit the Fitech harness, but does NOT fit the Holley Sniper. The problem is quite not as bad with my timing set at 15* idle, 36* cruise, 34* WOT. I’m very happy with the power it provides and the response is great. ... and noticed the O2 sensor reading, AFR, was steady climbing, and actually topped out … A big part of the Stealth “intelligence” is the wide-band oxygen sensor. The rest of the parts are available. I did read a bunch about the Holley HP system that answered a bunch of my questions specifically how to mount an O2 sensor, fuel system set up tuning and so on. Hope you get it sorted out soon! I called the Holley tech line twice but sat on hold both times for over an hour but never got thru to anyone. I also have low comp and mildish na camshaft which doesnt help. This is the Sniper unit on a big-block Chevrolet. Failure to disconnect the AIR pump or locating the oxygen sensor downstream from AIR injection will result in an extremely rich mixture, which could cause drivability problems and severe engine damage. I thought there was enough room in the location I chose, but it proved to be tough to see what I was doing in there. Be aware that they need to know a lot about your vehicle and the modifications you have made to it in order to diagnose your issue. So minimum 15 inches after O2. I've also heard that Holley doesn't sell ECUs separately. The o2 sensor and coolant temp sensor (CTS) absolutely have to be hooked up for this system to work right. I was more wondering about the Sniper specifically which doesn't pull up hardly anything. Holley repaired it under warranty, no questions asked. Holley Tech warned against sampling only one cylinder and having the sensor so close to the port but, I haven't had any issues with the installation in over 3,000 miles, except for the ECU taking a dump at about 650 miles. the Sniper instructions say it wants the system to have the sensors pointing downward at at least 10 degree angle. O2 sensors going bad can cause rich condition, vacuum leaks and manifold leaks can cause rich condition...basically the O2 sees the extra air and thinks you are lean so it drives the injectors to rich and problem. The only thing I’m working on with it is if I’m coming to a stop and downshift and use the engine drag to slow down then when I get to the light and push the clutch in the engine dies. FiTech offers these oxygen sensor bungs that allow the use of wide-band O2 sensors but don't require welding. After reading this Blog about Jeep Adventures Under the Hood and his documentation of the Jeep emissions and computer controlled carb, it clicked that hey, I might have a spot for the O2 sensor Sure enough, right above the collector flange, O2 port, that is plugged. I reprogramed the Sniper several times. To prevent “learning” that could cause the trim tables to go excessively rich, we ran the engine for a few hours to establish a decent tune that ran well. Despite the cam’s mild overlap, the on-board wide-band sensor produced readings of between 16:1 and 17:1 AFR on our wideband O 2 sensor. Thanks for the search string. Make certain! I should have mentioned them in my initial post about this. If you need to plug the hole temporarily, use an O2 sensor plug or a spark plug with an 18mm thread.

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