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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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Old 10-12-2012, 05:30 AM
Bafana Nkosi Bafana Nkosi is offline
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Mein Auto: BMW 318 E46
Bmw e46 1999-2000 rough idling

Please help! Iam driving a BMW E46 1999-2000 Model Automatic in the morning when you start the car the idling is just horrible as it fluctuates and once engine is hot then it becomes normal. It does this even when the car has used and parked for while for instance an hr and you have to wait until it stabilise before you hit the road.

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Old 10-12-2012, 06:01 AM
gotrice415 gotrice415 is offline
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Location: San Francisco Bay Area
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Mein Auto: M3, 335Ci, X5d, 750i
Could be a few issues if happening when cold. One is the Vanos unit. Do you hear rattling type noise in the front o the engine when this happens? If so, most likely a Vanos unit. If not, I would check the idle control valve.

Another common col misfire could be collapsed lifters, but you would hear ticking type noise.

Good Luck!
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Old 10-12-2012, 06:48 AM
TannerT TannerT is offline
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How bad is it? It could be the mischievous SAP. Hate that thing!

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Old 10-12-2012, 03:04 PM
jdauria jdauria is offline
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Mein Auto: E39 ///M5
Clean your MAF, check lower intake boot for crack/tear

Hook up your e46 to a code reader, and provide codes please
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Last edited by jdauria; 10-12-2012 at 03:09 PM.
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Old 10-13-2012, 03:36 PM
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jcjdavis1 jcjdavis1 is offline
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Mein Auto: E46 1999 323i auto
Hi. With the engine running take off the oil filler cap, if the rough idle is just the same you have a vacuum leak. I would change all your vacuum/breather hoses.
You will find all your hose in RealOEM, buy them from the dealer. Jim
The older I get the wrong bit gets stiff!!
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