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1984 911 Carrera Oxygen Sensor


Vehicle Information: Model: 911 Carrera; Year: 1984; Body Type: Coupe; Engine (type, size, modifications): BB Headers and exhaust - Autothority Chip; Total Mileage: 69,000;

Recently purchased a track car that runs in E- Prepared. Engine runs GREAT until I reattached the O2 sensor which I noticed had been disconnected along w the plug? adjacent to it in the engine bay. With both attached the engine runs as in a previous article below. "After starting or any driving, the idle is correct for 15-20 seconds, then it drops to a rough 600-650 rpms. It slowly rises from there, but never gets back to where it should be. This two-stage/delayed low rpm idle is a bit higher (700-750) when the car is fully warm, but it happens every time the car stops and the engine returns to idle. Only driving or throttle application can return it to the proper 880 for those 30 seconds".I disconnect the O2 sensor (not the one adjacent to it)and the engine idles perfectly!I have some service indication of a new O2 sensor (car has 69,000 miles on it). Has BB headers and BB exhaust w an Autothority chip.Should I start w replacing the O2 sensor or take it to a shop and have the idle and mixture settings checked?Your thoughts...Geoff

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