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964 Check Engine Light Question


ralendrum

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I know this may sound stupid but it is driving me crazy. I bought a 1990 C4 that is a ROW car (came from Japan but is LH drive). I took it to a "reputable independent shop" in Calgary and they really picked the car apart. One issue was that the person that had it before me had a "chip" installed. As soon as they heard this they went on and on about the check engine light not working and therefore someone had disconnected it. I drove the car home and stored it away for the winter so I did not verify this myself but according to a book (Dennison ?) that came with the car the check engine light was not installed until 1991. Does anyone know anything about this?

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Thanks for the input. I believe that it was supposed to be a mid year change for 1991. Since I don't have this car in my garage I can't even tell you if it even has the light or not. I have a couple of jobs to do on my wife's 2000 996 (used to be ours till I bought the 964) then I will swap them around and look at this one.

Now off to deal with the runaway seat in the 996

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  • 3 weeks later...

Just a quick update to the mystery of the Check Engine Light. I removed the gauge and checked. There is a Check Engine light opening on the back of the gauge. The hole was filled by a white plug. The same type of plug filled several other sockets that are not in use in my car. I installed a bulb in the socket and the light comes on when I turn the ignition on and it goes out when the car starts but I don't think it is really connected to anything. I will leave the bulb in it just for curiosity.

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Just a quick update to the mystery of the Check Engine Light. I removed the gauge and checked. There is a Check Engine light opening on the back of the gauge. The hole was filled by a white plug. The same type of plug filled several other sockets that are not in use in my car. I installed a bulb in the socket and the light comes on when I turn the ignition on and it goes out when the car starts but I don't think it is really connected to anything. I will leave the bulb in it just for curiosity.

Leave it in, as long as it is working properly, else, you will fail the SMOG / Emissions test if the light does not come on at the start/off after ignition. I have a different problem, my CEL comes on at pre-ignition, turns off after ignition, and comes back on after 45seconds or so. If the RPMs are 1100+, the light stays off. If the RPMs are at normal idle, the light comes on after 45seconds. If I rev the engine every so often (within the 45 sec window) the light stays off. Doe anybody have any ideas?

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  • Admin
Just a quick update to the mystery of the Check Engine Light. I removed the gauge and checked. There is a Check Engine light opening on the back of the gauge. The hole was filled by a white plug. The same type of plug filled several other sockets that are not in use in my car. I installed a bulb in the socket and the light comes on when I turn the ignition on and it goes out when the car starts but I don't think it is really connected to anything. I will leave the bulb in it just for curiosity.

Leave it in, as long as it is working properly, else, you will fail the SMOG / Emissions test if the light does not come on at the start/off after ignition. I have a different problem, my CEL comes on at pre-ignition, turns off after ignition, and comes back on after 45seconds or so. If the RPMs are 1100+, the light stays off. If the RPMs are at normal idle, the light comes on after 45seconds. If I rev the engine every so often (within the 45 sec window) the light stays off. Doe anybody have any ideas?

You need to get your fault codes read - everything is a guess without fault codes.

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