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Old Tue, Oct-23-2007, 01:45:10 AM   #1
stevec
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Default Rough idle common in M3

Reasonably new owner 1998 sedan. It idles a bit rough at stop. I was told this is common ( yes and I was born Yesterday) where should I look first? I added a cold air intake but it was doing this before the add on. Some days it runs like a scared rabbit and some days it is a dog... wonder if it is related to the idle. Thanks for your input and patience!
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Old Thu, Feb-02-2012, 08:52:08 AM   #2
Eric M3
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Default Re: Rough idle common in M3

This is definitely not common, my 02/98 M3 idles smooth.
Did you measure for air leaks in intake system, temperature sensors for air intake and coolant?
Has the crankshaft position sensor already been replaced on your 1998 M3 under the recall against a new one with 12V instead of the old 5V version plus a new harness for that? If not, or not known, check with your dealer if there are any recalls open.
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Old Sat, Jun-29-2013, 08:13:59 PM   #3
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Default Re: Rough idle common in M3

Does the recall apply to '97's (10/96 build) too?
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Old Sat, Jun-29-2013, 10:17:45 PM   #4
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Default Re: Rough idle common in M3

how's your gas consumption?

I had a bad o2 sensor that caused a bad idle, and poor performance and gas mileage...but then again, my car threw a code as well...

Just another suggestion. I would check what Eric M3 said first
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