I have reciently aquired a 1992 onlds Cutlass Cierra and am perplexed by its little problem.
The car runs a little sluggishly when cold, almost like there is a missing cylinder, but once the car is warm, the engine runs fine...except that the MIL comes on periodically when the car is cruising around 35-55 and will go off if you slow down. the MIL comming on is not accompanied by any change in the way the car performs, so i have checked the code. It is giving me a code 26, which translates to a Quad-driver error. I have looked all over the internet for suggestions on troubleshooting this issue, and have not come up with anything diffinitive yet. I would venture to bet that it is the EGR control selinoid that is not funtioning correctly, but my readings lead me to believe that this might not be correct. I can not find a diagram that shows what items are controlled by the Quad-driver for this ECM, and so i can not be sure what all i would need to test.
Any help would be appreciated.