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This car has really thrown me through a loop. Started w/check engine light coming on and when it did there was throttle hesitation and lack of power, and then unnoticed that my fans were not running and it would overheat if just idling, and if the light was on when I first started it then it would rev high! When the light was off car ran like a dream, totally fine! So, twice in the same day when it came off I stopped of at my handy parts stores to let them do the work of crawling under that dash to plug in the code reader and both time with the light on came back no error! So I changed the ECM, and then it got worse then it ran like it did with when the light was on only all the time. I know a bad ECM can cause other sensors to go bad as well, so I replaced the TPS, and the coolant temp sensor, and made sure the MAF was clean and voltage tested it. And to no avail!!!! And tried every method of resetting the ECM I could think of, and that was quite a few! And it does have an OBD2 style plug for the code reader!!!! Any suggestions would be a huge help!!!!
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Sorry I can’t help with your problem. Not long ago I was bs’ing with some friends, both have been GM techs since the 1980;s. I recall them both agreeing, GM cars from the 90’s had the most problems with electronics. The dinosaur age of automotive electronics, most of it was very low quality with a high failure rate. You might be wise to just unload the car and get something newer.
Overall quality was poor in that decade, the 1990’s.
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