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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Mon, Nov-01-2010, 08:26:18 AM   #1
e46Cali
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Default rough idle at start up

i have noticed a few times at start up my idle is a little rough and drops down and back up a few times before leveling out to a smooth idle. i live in San Diego and it doesnt get much colder than 50 in the mornings. any ideas whats wrong, or is this normal?
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Old Mon, Nov-01-2010, 02:22:11 PM   #2
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Try cleaning the MAF to see if it takes care of it.
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Old Mon, Nov-01-2010, 03:11:18 PM   #3
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normal
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Old Mon, Nov-01-2010, 03:41:39 PM   #4
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NORMAL
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Old Wed, Nov-03-2010, 04:53:55 AM   #5
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I know you said it is normal.. but do you know what causes this?

Thanks.
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Old Wed, Nov-03-2010, 04:58:27 AM   #6
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My car does it too..it is nothing serious what so ever. Once you put headers/exhaust it will actually sound like you have cams or something when it idles that rough lol. Makes it seem like a drag/race car
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Old Wed, Nov-03-2010, 12:13:29 PM   #7
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It is like right before your take a run in the park. Would you run a mile without stretching? Once the car has been sitting over night, the first start the computer is adjusting so it can run at optimal performance.
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Old Wed, Nov-03-2010, 01:12:57 PM   #8
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Quote:
Originally Posted by Iceberg157 View Post
It is like right before your take a run in the park. Would you run a mile without stretching? Once the car has been sitting over night, the first start the computer is adjusting so it can run at optimal performance.
my car told me it doesnt stretch, it just gets **** done
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Old Wed, Nov-03-2010, 01:29:40 PM   #9
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nobody likes to get up early in the morning. not even an M3.
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Old Wed, Nov-03-2010, 02:25:41 PM   #10
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^ HAHAHA totally agree
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Discussing rough idle at start up in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)