Bimmerfest - BMW Forums

Bimmerfest - BMW Forums (
-   7 Series - E38 (1995 - 2001) (
-   -   Cylinder 6 keeps misfiring (

lazezo 01-20-2013 03:11 PM

Cylinder 6 keeps misfiring
Hi everyone. I need your help
After replacing a Leakey antifreeze reservoir with a week or two my 740i e38 started to misfire on cylinder 6 I went ahead and changed the spark plug and misfiring stopped so I changed the other spark plugs too a month later the same cylinder started to misfire again going on and off and ended to be off line most of the time , please help. Thank you.

BMWFatherFigure 01-20-2013 09:21 PM

Bad coil pack; bad lifter or oil coming down the inlet valve guide. This ignores damaged wires, bad earths etc. How are compression numbers?

lazezo 01-20-2013 10:58 PM

The plug comes out dry would this rule out the oil leak, did not check the compression but the plug worked fine for a month after replacing this might also rule out the bad earthing too, is there other checks that I can do befor going to compress test, thanks.

BMWFatherFigure 01-21-2013 09:59 AM

Lifter becomming defective or coil pack. Change the coil pack with one of the others and see if the fault moves.

lazezo 01-21-2013 07:03 PM

Cylinder 6 has the earthing wire on it so I tightened it since it was loose a little bit everything is fine till now I will give it couple of days and confirm thanks for the help.

BMWFatherFigure 01-22-2013 10:23 AM

Now undo it and clean up the earth point and all the terminals with emery or wet and dry, refit. The do the same the other side. Then do every other earth point and connector plug you can find. That should prevent further, similar, problems.

lazezo 01-23-2013 06:32 PM

Thanks I will do that. Car is stable now.

All times are GMT -7. The time now is 07:48 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
© 2001-2015 performanceIX, Inc. All Rights Reserved .: guidelines .:. privacy .:. terms