Mysterious dash light

bmw

#1

I have a 1989 BMW 635csi. Usually runs great. Driving down the freeway yesterday, the car started to run rough and the yellow ABS light came on. I slowed, the car ran smoothly, but then the ABS light would come on. By accelerating or decelerating, the light would go off. But in stop & go traffic, the engine ran very roughly and I smelled unburnt or poorly burnt exhaust. Took it to the BMW place today. Runs great. They cannot duplicate the problem. Any ideas?


#2

Well, ABS is your anti-lock brake system, so that light shouldn’t impact how your engine runs. Is it possible that “poorly burnt exhaust” was maybe burning brake pads?


#3

Checked that at the time. Definitely not a brake smell and the brakes were not hot. Braking seemed normal as well.