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Old 07-16-2004, 08:34 AM
dvs7310 dvs7310 is offline
Registered User
Location: Overland Park, KS
Join Date: Jul 2004
Posts: 2
Mein Auto: '96 328is
Unhappy Rough idle and Check engine light???

I have a '96 328is with 147,000 miles on it. It has been realitivly trouble free until last week. Recently when I first would start the car when the engine was cold it would give a little bit of rough idle, but if I hit the throttle, it would rev with no problem, so only bottom end idle was affected. Shortly after that (unrelated I think), the water pump failed and I had it replaced (regrettably) at a BMW shop because it was a holiday and no one else was open. Check engine light came on that day too because the engine overheated. I only replaced the water pump, not the thermostat. Check engine light was off after we left the BMW shop in Wichita. After about 700 miles, my check engine light came back on and when I first start the car on a cold engine now, it gives a very rough idle and if I don't hit the throttle it will die until the engine warms a little. Seems to be getting worse though, and I'm not sure it is going to idle with a warm engine here after too long. Fine at any engine speed other than idle though, that is what is strange to me. Any ideas? I hate to start randomly replacing parts. Seems like potential problems are O2 sensors, Mass Airflow sensor, Idle control valve, who knows what else.

Thanks in advance.
D. Sherrick
Old 07-16-2004, 12:51 PM
dvs7310 dvs7310 is offline
Registered User
Location: Overland Park, KS
Join Date: Jul 2004
Posts: 2
Mein Auto: '96 328is
Interesting, I unplugged the Mass Airflow sensor at the advice of a VW mechanic I work with and now the car runs much better, check engine light still on. Looks like I have found the problem. What does running without the MAFS do?
Old 07-16-2004, 07:55 PM
Mr Paddle.Shift Mr Paddle.Shift is offline
Officially Welcomed to the 'Fest
Location: bmw
Join Date: Dec 2001
Posts: 3,848
Mein Auto: bmw
Just go get the CEL checked.

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Old 07-16-2004, 09:48 PM
kurichan kurichan is offline
Waiting for the 135i!
Location: San Diego
Join Date: Apr 2004
Posts: 1,457
Mein Auto: 550 Spyder
Never like to hear that the engine overheated. I hope your heads and rings are OK. You might have a leakdown/compression test done. My neighbor's M3 dropped to 50% after an overheat...

Drop by an Autozone and use their code checker. It's free and really ez.

Good luck.
7/17/04 - 7/20/07: 04 Imola Red/Alcantara 330i (ZHP, 6MT, moonroof, xenon, silver cube). 135i ED next!

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