20 Most Recent 1990 Chevrolet K2500 Questions & Answers

Can't say for sure don't have that manaul but look inside the glove box for a plastic cover it will say relays .The 1st is the fuel pump 2nd I belive would be the horn 3rd would be the fog lights .They are all the same and can be swooped out for each other to test them .

1990 Chevrolet... | Answered on Apr 22, 2015

I would check the O2 sensor wires and anything that may have got between the block and transmission, when you put the motor in. Also, you may have a sticking fuel pressure regulator. Also check all your connections to the sensors on the motor. Any check engine light on?

1990 Chevrolet... | Answered on Apr 26, 2014

Check the CO/Temp sensor in the exhaust manifold. It may tell the ECU that the engine is hot when it is cold or cold when hot, getting the mixture wrong.

1990 Chevrolet... | Answered on Mar 25, 2014

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