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7 Series - E38 (1995 - 2001)

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  #1  
Old 10-27-2012, 09:03 AM
xtraordenery xtraordenery is offline
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Location: Franklin Va.
 
Join Date: Oct 2012
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Mein Auto: 1995 740i BMW
Red face really rough idle

My 1995 740i E38 is idling very very rough, I tried changing out all new plugs and coils but it still is running with a bad mis. Can anyone suggest anything?
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  #2  
Old 10-27-2012, 01:27 PM
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beemer1804 beemer1804 is offline
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Location: Pennsylvania
 
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Mein Auto: 95 740IL
Check for vac leaks, and then check fuel pressure if necessary

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  #3  
Old 10-28-2012, 04:58 PM
bossman1 bossman1 is offline
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Location: New York
 
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Mein Auto: 740i Sport
You could also try disconnecting your maf and see how the car runs.
If it runs better without the maf you need to either clean your current maf or buy a new one.
MAF problems are very common problems with e38's. At least its not a hard fix lol
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  #4  
Old 10-28-2012, 05:40 PM
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beemer1804 beemer1804 is offline
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Absolutely, i forgot to put that also, good eye

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  #5  
Old 10-28-2012, 08:05 PM
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BMWFatherFigure BMWFatherFigure is offline
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Location: Perth, Western Australia
 
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Posts: 2,368
Mein Auto: E23;E30;E38;E32;E34 +
Try removing and test rig cleaning injectors. Clean idle control unit valves. +1 on fuel pressure check and replace fuel filter.
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  #6  
Old 10-29-2012, 06:04 AM
ou18 ou18 is offline
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Location: Boca Raton FL
 
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Mein Auto: 1997 740 IL
Check the gasket between the throttle body and intake mani with Throttle body cleaner. Start the car, spray some around where the two meet, If your idle changes, you have a leak...
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  #7  
Old 11-05-2012, 03:01 AM
mgoods50 mgoods50 is offline
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Location: Nashvegas
 
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Posts: 74
Mein Auto: E36 M3
1) how long have you owned the car? If you're a new owner, proceed to question two-

2) do you have a nikasil block? If yes, decide whether you want to replace the engine block, or part out the car and cut your losses.
Look up casting numbers, searching for your engine and that term- I'll throw you a bone-- the casting number is beside the block coolant drain bolt, on the passenger side (US LHD model).

Start here before lifting a finger on anything else.
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