Question about 1995 Chevrolet C1500

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944 chevy 1500 running extremely rich with no errror codes any sugestions

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  • wmstalk Aug 25, 2010

    HI, do you smell fuel or is there alot of black around the tail pipe? and what engine does this truck have? thank you

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If you can check to make sure its running at operating temperature and it's not try a new thermostat. I had a similar problem. The thermostat wouldn't close so the motor ran to cool and the computer seem to think it was always cold outside so it ran rich all of the time. If you have had this problem for a while it will also load up the intake and the line to the EGR with unburnt fuel and you should clean them up.

Posted on Aug 25, 2010

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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.

The O2 and MAP sensor take reading and sends it to the ECM to recalibrate the fuel injector pulse to adjust the amount of fuel entering the cylinders. When there is an issue to the O2 sensor or MAP sensor and even both, the ECM will be set a a factory default to run rich to keep the engine running and at times the engine may not even run. Normal fuel to air ratio is 14.7:1 - 14.7 air to 1 parts fuel and at default it could be as high as 12.5:1. Good luck and keep me posted, be glad to help you get your truck running 100% again soon and please rate. replacing the thermostat and temperature sensor would also be a good thing since the 4.3 runs best at 190".

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1 Answer

Fuel /emmision


If it ran extremely rich for months and now it won't start, the spark plugs are fouled out. Replacing them will fix your problem -- temporarily.

You'll probably want to check the O2 sensor(s) and replace them as they are probably the cause of the car running extremely rich.

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