97 328i has racing rough idle, I'm at a loss - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 04-19-2013, 05:28 PM
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97 328i has racing rough idle, I'm at a loss

I recently bought a 1997 328i convertible for my wife, it had a rough idle so I replaced the idle air control valve, the hose to it, valve cover gasket, and the spark plugs. Now when you start it, it races up to 3000 RPM, then comes down to a rough idle. After driving it, it races at a stop while in gear and makes it almost impossible to stop and when I got home, put it in park, it almost redlined the tach, I had to shut it off! When I re-started it, it raced up there again? Any ideas? I am very mechanically inclined but I don't have much experience with BMW's and I'm at a loss right now. Any help would be greatly appreciated.
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#2 (permalink) Old 04-20-2013, 09:44 AM
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Start by checking for vacuum leaks in the intake boot and vacuum lines. Look and feel for small cracks or tears. If their is none, check the throttle cable to see if its sticking.


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#3 (permalink) Old 04-20-2013, 10:12 AM
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I already went over it all, no bad hoses that I found, there was a small ctack in the intake boot where the nipple comes out that goes to the IAC valve. I siliconed that shut for now until I have the problem figured out. The throttle cable move free and easily. I've never seen such a crazy thing like this! The valve cover gasket set did not come with new grommets, and I saw 2 cracks in the plastic (very brittle), I epoxied them the best I could. Do you think any of those could have anything to do with it?

Thanks
Dan
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#4 (permalink) Old 04-21-2013, 09:17 AM
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You need to replace the VGC. Wheter its connected or not, it needs to be replaced. New nuts with attached grommets are available. BimmerSpecialist.com will have both the gasket kit and the grommets. Thats where i got mine from.


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#5 (permalink) Old 04-21-2013, 10:51 AM
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VGC, meaning valve cover gasket? I did replace that but the gasket didn't come with new grommets, just the rubber gasket.
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#6 (permalink) Old 04-25-2013, 07:49 PM
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Yes, VCG means Valve Cover Gasket. If any of the grommets are missing you should replace them.

Where did you epoxy the plastic?


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