Question about 1991 Chevrolet C1500

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My 91 chevy truck wont idol and runs really rich the code it reads is 45 oxygen sensor rich

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  • Dan
    Dan May 11, 2010

    Is the exhaust smoke black/blackish in color?

    Is air filter clogged?

    Have you recently ran low or out of gas?

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Make sure the Coolant temp sensor for the computer is actually working right.  Its the one next to the thermostat housing, it has nothing to do with the gauge.  When they go they usually don't throw any codes because they kind of work enough (same with the O2) to throw way to much fuel at the motor when it's hot, causing flooding out, stalling, etc. and of course it's no good for the O2 or the catalytic convertor. 

Posted on May 01, 2010

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1 Answer

Engine codes are 12, 51,21,53,55 can someone tell me what these codes are. engine is running extremely rich.


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51 & 21, basically telling you same thing, but I wouldn't jump at changing oxygen sensor first, as a bad M.A.P. sensor can cause a rich mixture, thus oxygen sensor switches to lean to try and compensate. Personally, I'd go with map sensor first, check connections and vacuum lines if all good, replace it, then I'd go to oxygen sensor .

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I have a 1990 chevy truck, it Idols high - low in town


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91 chevy 4.3 v-6 runs extremely rich when engine is cold gives codes 13, 33 and 54 I know what these codes are but I need to know is could the computer coolant temp sensor or the air cleaner temp sensor...


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Start with checking the wire leads to the O2 sensors and MAP sensor. Look for any damages to the wire harness and replace any parts damaged or faulty.

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1 Answer

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