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E21, E30General discussion and technical help for 1975-1991 3 series cars.
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Your Ride: 1991 325i; 1988 325is
check engine light
well here it goes, last night i was driving with about 55mph, went uphill and once i was going downhill, i took my foot of the pedal, the car was still going with about 50 and i noticed my check engine light came on briefly, once i started to slow a bit and it went off. it did happen like this before, going downhill with my foot of the pedal.
can any1 explain why this happened, does it has to do with electrical or air, any advice is appreciated, i mean is it common to happen like that.
It's a guess. If not the sensor connections, maybe the relay is intermittently faulty. Or it could be something completely different. You need to read the fault code(s) stored to find out what is wrong, using the "5 stomp method" . . .