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E21, E30General discussion and technical help for 1975-1991 3 series cars.
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Your Ride: 1985 323i
Engine cuts out
Hi all.
I've just bought myself a 1985 323i project car. Doesn't need alot doing to it but at the moment it has one really annoying engine problem. Under "normal" acceleration at the lower revs, the engine cuts out for a moment and then continues as if nothing happened. I'd describe it as a cough. It seems to be more throttle related than rev related but I'm not sure. Other than that, the engine idles OK cruises OK and pulls really smoothly all the way up to 6000rpm. Any thoughts?
FYI So far I've checked the Filter (almost new) and the Mass Air Flow Sensor. The MAFS seems to have a quirk though. In the first few millimeters of the flap movement, the measured electrical resistance drops from 95ohms to 55 ohms, then as I move the flap further, the resistance begins to rise again. I would have expected the resistance to show a continual rise right from the start. Does anyone know if this is normal?
I'd be grateful for any help that people can give.
Thanks in advance.
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Your Ride: 1994 BMW 525i, 1987 325is, 1986 325
Bad MAF, they wear out every 80-100,000 miles or so. Old potentiometer type. Replace with NEW OEM style, a used part is likely to be worn out or wear out soon.
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Big Evil, The BMW driving monster of the American Southwest (Currently on BMW #5)
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Your Ride: 1985 323i
Quote:
Originally Posted by Big Evil
Bad MAF, they wear out every 80-100,000 miles or so. Old potentiometer type. Replace with NEW OEM style, a used part is likely to be worn out or wear out soon.
Thanks BigE. Are the OEM style MAFs an aftermarket job or off a later model? If from a later model then which model and are they a direct bolt-on job?
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Your Ride: 1994 BMW 525i, 1987 325is, 1986 325
OEM Original Equipment Manufacture. Should look like and perform like what you're replacing......only it'll fully function properly. AutohausAZ, BAV Auto, Pelican Parts, someplace like that should do it.
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Big Evil, The BMW driving monster of the American Southwest (Currently on BMW #5)
09-28-2009, 09:25 AM
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