i had an exhaust job done on my truck. the truck is a 1990 gmc 1500, 2wd, 350. i had the cat removed with a flowmaster muffler on it. now the truck runs horrible. after a while the check engine light came on and the code says o2 sensor. i only found one o2 sensor in the left manifold. i replaced it and it did nothing. i did find a wire though hanging free by the distributor. it is the same color, size, and same connector as the o2 sensor connector. but it's disconnected. i think there might have have been another o2 sensor on the truck and the guy just unplugged it under the hood when he removed the cat, while doing the exhaust. i dont know if unplugging an o2 sensor can make a vehicle run bad (miss, stumble, ect.) but ive done every thing else. ive even had the throttle body checked and distributor checked for damage and it all looks fine. i know newer trucks have 4 o2 sensors, but if anyone knows how many this truck should have or what i should do to fix it, i would appreciate it.
2007-11-01
12:57:08
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4 answers
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asked by
Anonymous
in
Maintenance & Repairs