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I have an 87 GMC that fails smog?
I have an 87 Gmc pickup its TBI, it has high emissions it fails because its running to rich. The plug's, wires, cap, rotor, and coil are new. It has a brand new AC DELCO O2 sensor that works great. It also has a brand new Catilatic Converter less then a month old. It still is running to rich idk what else could it be help me out if ya can.
I dont think its that the gears are worn, it keeps perfect timing, it has to be something with the fuel system.
1 Answer
- jim1Lv 51 decade agoFavorite Answer
warn gears and chain on cam and crank that keep the two timed with one and another
have you renoved timing chain cover and done an inspection on components??????????