BMW E32 7 Series 1988-1994 (735i/iL, 740i/iL, 750i/iL)
rough Idle
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Replies:
8
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1
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Last Post:
Mar 4, 2009 3:58 PM
Last Post By: porkface
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Posts:
14
Registered:
05/05/04
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rough Idle
Posted:
Dec 14, 2004 1:34 PM
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I have a 94 740il when the outside temp gets below 60F
the car idles rough and eng light comes on I have replaced
both oxygen sensors
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Posts:
4,105
Registered:
01/18/04
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Re: rough Idle
Posted:
Dec 15, 2004 12:37 PM
in response to: diakonos
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Sounds like the coolant temperature sensor is not working, check that.
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Posts:
24
Registered:
12/11/04
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Re: rough Idle
Posted:
Dec 16, 2004 1:48 AM
in response to: diakonos
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I think Port Fellamay is right. Alot of BMW's sensors and switches can be checked with a multimeter. Perhaps someone has the necessary data so you can check and see if your sensor is truely bad?
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Posts:
16
Registered:
01/01/05
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Re: rough Idle
Posted:
Jan 1, 2005 9:21 AM
in response to: SteveR120
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i think you got the problem with((93 740iL fault codes))by bad7
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Posts:
14
Registered:
05/05/04
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Re: rough Idle
Posted:
Jan 3, 2005 11:01 AM
in response to: HiFly
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what do you mean bad7 fault code
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Posts:
1
Registered:
01/17/05
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Re: rough Idle
Posted:
Jan 17, 2005 10:56 AM
in response to: Port Fellamay
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I have same fact pattern as Diakonos. Have '94 740i. Where is the coolant temp. sensor located? Is this sensor also described as an engine temp. sensor? Yes, I am new at this! Thanks.
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Posts:
1
Registered:
03/02/09
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Re: rough Idle
Posted:
Mar 4, 2009 10:14 AM
in response to: diakonos
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I just purchased 92 735iL. I have rough idle too. I was told by the previous owner that he replaced the plugs but not the plug wires. Is this the cause of the rough idle. This is my first bmw. I like the car
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Posts:
4,669
Registered:
12/09/03
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Re: rough Idle
Posted:
Mar 4, 2009 1:51 PM
in response to: Bartee
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I wouldn't think it is the plug wires. Check carefully for vacuum leaks. Does it seem to idle ok when cold? Things like rubber boots and the large hoses develop cracks. Also the idle control valve could be suspect. They can be cleaned to see if it affects the idle quality, just be careful not to let the electrics get soaked in carb cleaner. Also clean the throttle body.
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Posts:
147
Registered:
01/06/04
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Re: rough Idle
Posted:
Mar 4, 2009 3:58 PM
in response to: Bartee
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on the 735-the engines are different than the v8 you posted on. you have a 6 which needs a valve adjustment every 15k miles-and that has a big effect on idle. a new post would be the way to go in the future. not all e32s are created equal. but, your first bmw, there's lots to learn. good luck, chuck.
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