Question about 1995 Oldsmobile 88

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The check engine light comes on after driving a while

The check engine light comes on after driving a little while. I brought to the mechanic. He tells me that the engine is only getting to 205 degrees with an actual thermostat. The computer is telling him it is running 285 to 305, thus causing the check engine light to come on. he has change the sensor plug that sits high on the engine to no avail. Please advise a solution.

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  • Dave  C
    Dave C May 11, 2010

    What was the code number?



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I have ran into a few instances like this in the past. 1. the sensor itself is bad-not the connector. and 2. you have a blown head gasket that is blowing hot cobustion gases directley at the area where the temp sender is.I ran into this same problem on a 350 chev this past spring and was the head gasket. You can take to your machanic and see if he has a tester he can out on the radiator that checks for combustion gases, this would be your for shure check!

Posted on Aug 25, 2009


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From what I can gather, the engine cuts out and then the check engine light comes on, not the other way around, check engine light and then cut out?

If you switch on the ignition but do not start the engine, you will see that the check engine light is on. It won't go out until you start the engine.

When the engine cuts out, it is just as though you have switched on the ignition without starting the engine, the key is in the exact same position, and therefor the check engine light comes on purely and simply because the engine isn't running, not because it has sensed a problem, hence you have no fault codes, its perfectly normal.

If, however, the light comes on then the engine cuts out, then the reason for the lack of codes could be a short term electrical failure. If the power to the ECM were briefly cut then the codes would be erased immediately, but this would have to be a complete failure because there is a KAM (Keep Alive Memory) wire, which supplies permanent power to the ECM if I'm not mistaken. A good candidate for a complete failure is a bad main ground cable (loose or broken).

Wiring problems a just the worst ever to trace.

Just a thought to hopefully point you in the right direction.

Very best regards


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