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RICH! (The engine, not me) 700

posted by  someone claiming to be bl on  Sat Mar 27 14:55 CST 2004 [RELATED]

I'm chasing a rich and I mean rich problem. Engine blowing black smoke, mileage 10 mpg (you can watch the gas gauge go down), idleing like crap etc etc. I don't even wana think about the condition of the CC. ANyway, the voltage I'm getting off the O2 sensor is low and varies between .10-.25v with the engine idleing. The voltage reading does not change with the engine throttled up to 3000 rpm's. It never goes over .25v. I've tried 2 sensors that are known to be good and the voltage reading is the same with each. I've also swapped fuel pressure regulators and that isn't the problem. Leaning the mixture by pulling a vacuum line off the intake manifold makes a dramatic difference and the engine immediately idles normally and is smooth at 3000 rpms. What the crap is going on with this thing? I've searched the archives until I'm falling asleep at the computer at 2AM.

bl






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