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I have a 93 chevy C1500 with TBI. While driving check engine light comes on. Until the code is erased, idle engine speed fluctuates and eventually shuts off. The code says bad O2 sensor. Don't believe this is the problem since I've replaced it twice. Also, the fuel pump has been replaced twice, plugs, wires, distributor cap rotter and coil, EGR valve, MAP sensor, TP Sensor, cleaned off all engine grounds and none of that fixed the problem. Any other suggestions?


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Location: Oregon
what is the code number that you believe says bad O2 sensor?

is the code for rich or lean, or is it for not changing between rich and lean enough times. Have you looked at you O2 sensor signal? it should go over 0.8 and under 0.2 back and forth. If it is hot it should be pretty rapidly. If you pump the gas pedal a few times it should go rich for a little while. If you open a vacuum port it should go lean. Your fuel trim should be around 128 for short term and long term. Drive with the scanner hooked up and watch the O2 sensor and the fuel trims to see what is happening.


   
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