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-   -   really rough idle (

xtraordenery 10-27-2012 09:03 AM

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?

beemer1804 10-27-2012 01:27 PM

Check for vac leaks, and then check fuel pressure if necessary

War Machine

bossman1 10-28-2012 04:58 PM

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

beemer1804 10-28-2012 05:40 PM

Absolutely, i forgot to put that also, good eye

War Machine

BMWFatherFigure 10-28-2012 08:05 PM

Try removing and test rig cleaning injectors. Clean idle control unit valves. +1 on fuel pressure check and replace fuel filter.

ou18 10-29-2012 06:04 AM

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...

mgoods50 11-05-2012 03:01 AM

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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