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Re: 1993 K1500 running rich
The computer does not use the oxygen sensor data after the engine is started cold until the sensor gets hot enough to operate and take the system to “closed loop” operation.
Make sure the vacuum line to the MAP sensor is in good condition. If you have a vacuum gauge, test the vacuum at the sensor.
A restriction on the fuel return line that causes high fuel pressure can cause a rich condition. Injectors for a larger engine then the truck has can cause a rich cindition when cold.
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For those of you that are wondering why you are not getting replies to your thread:
Did you give the model, year, engine, fuel system type, and transmission information?
If it is modified from what came stock from the factory, let us know that too.
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