Idles Rough on Start Up.... - Bimmerfest - BMW Forums

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7 Series - E38 (1995 - 2001)

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Old 05-12-2013, 06:56 AM
Ultm8drvnmchn Ultm8drvnmchn is offline
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Location: Colorado,USA
Join Date: Sep 2009
Posts: 243
Mein Auto: 98 740il
Idles Rough on Start Up....

My 98 il SOMETIMES.... mostly after sitting for a day or 2, will start and run rough for 10-15 seconds, caughing and trying to ckear itself up... which it does on its own. Its pretty harsh and hasnt done this in the past. Once its cleared up, its fine and operates normally. Im getting ready to change the fuel and air filters next week. (parts on the way from Auto haus AZ),,,, Spark plugs were done about 2 years ago... mileage on them is not excessive. Any ideas on what might be failing or what might beed attention?
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Old 05-20-2013, 09:02 AM
SELFMADE323 SELFMADE323 is offline
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Location: connecticut
Join Date: May 2013
Posts: 2
Mein Auto: 01' 7401L BMW
dealing w the same thing w my 01', rough idle at start and slight coughing at low speed and take off wtf? IDK!!!
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Old 05-26-2013, 07:50 PM
01_740i 01_740i is offline
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Location: Massachusetts
Join Date: May 2013
Posts: 9
Mein Auto: 2001 BMW 740i
Try changing the sparkplugs. You'll be surprised how much better your car will run and drive.
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Old 07-14-2013, 10:49 PM
Podmore Podmore is offline
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Location: Adelaide South Australia
Join Date: Feb 2008
Posts: 222
Mein Auto: 2001 BMW 735i
Check plugs first, for oil around the insulators (leaking from valve cover seals) or carbon build-up which might indicate leaking valve stem seals or worn piston rings. Smoke at start-up is a clue.

If they are all OK, then try cleaing the throttle body. Sometimes these get pretty gummy and the goop prevents the throttle butterfly from opening to its proper idle setting (till it warms up) and too rich a mixture will result in poor idle.
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