My 1990 E30 gets a check engine light at idle sometimes, and it seems to only get it when idling for a while, but as soon as i rev the engine, it goes away. What can cause this kind of check engine light?
Have you heard of the "stomp test" before? Stomp the pedal to the floor 5 times in 5 seconds and it will display a fault code. Stomp it down again 5 times in 5 seconds for the next code until you see "1000". Below is a link to common E30 fault codes
This guy is just a spammer. The product in the link is cheap china crap. Don't even bother clicking it.
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