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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 7 Series / 8 Series > 7 Series - E38 (1995 - 2001)

7 Series - E38 (1995 - 2001)

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  #1  
Old 01-20-2013, 03:11 PM
lazezo lazezo is offline
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Location: Fort collins,Colorado
 
Join Date: Nov 2008
Posts: 19
Mein Auto: 740i 98
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.
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  #2  
Old 01-20-2013, 09:21 PM
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BMWFatherFigure BMWFatherFigure is offline
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Location: Perth, Western Australia
 
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Mein Auto: E23;E30;E38;E32;E34 +
Bad coil pack; bad lifter or oil coming down the inlet valve guide. This ignores damaged wires, bad earths etc. How are compression numbers?
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  #3  
Old 01-20-2013, 10:58 PM
lazezo lazezo is offline
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Location: Fort collins,Colorado
 
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Mein Auto: 740i 98
Hi
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.
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  #4  
Old 01-21-2013, 09:59 AM
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BMWFatherFigure BMWFatherFigure is offline
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Location: Perth, Western Australia
 
Join Date: Aug 2012
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Mein Auto: E23;E30;E38;E32;E34 +
Lifter becomming defective or coil pack. Change the coil pack with one of the others and see if the fault moves.
__________________
Good - Fast - Cheap: Pick any two.
Current:
E23 735i; E32 735iL (X 2 - 1 Alpine White and 1 Glacier Blue); E34 535i; E38 735iL; R50 Cooper; R55 Cooper Clubman.
Previous:
E21 318i; E30 318i; E32 735iL; E34 535i; E38 730iL; E53 4.4i
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  #5  
Old 01-21-2013, 07:03 PM
lazezo lazezo is offline
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Location: Fort collins,Colorado
 
Join Date: Nov 2008
Posts: 19
Mein Auto: 740i 98
Hi
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.
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  #6  
Old 01-22-2013, 10:23 AM
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BMWFatherFigure BMWFatherFigure is offline
Old School
Location: Perth, Western Australia
 
Join Date: Aug 2012
Posts: 2,144
Mein Auto: E23;E30;E38;E32;E34 +
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.
__________________
Good - Fast - Cheap: Pick any two.
Current:
E23 735i; E32 735iL (X 2 - 1 Alpine White and 1 Glacier Blue); E34 535i; E38 735iL; R50 Cooper; R55 Cooper Clubman.
Previous:
E21 318i; E30 318i; E32 735iL; E34 535i; E38 730iL; E53 4.4i
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  #7  
Old 01-23-2013, 06:32 PM
lazezo lazezo is offline
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Location: Fort collins,Colorado
 
Join Date: Nov 2008
Posts: 19
Mein Auto: 740i 98
Thanks I will do that. Car is stable now.
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