Misfire on Cyl 1 & 6

JCz04Bimmer · 04-22-2009, 10:56 AM

Just as the title suggests, I've experienced two instances where both Cylinders 1 and 6 misfire. The engine lugs along and return to normal after stopping and starting the engine. It was caused, in both cases, by an aggressive heel-toe downshift. Has anyone else experienced this? I know ignition coils are a weak point on the S54 so my guess is that 1 and 6 are on their way out. I'm just curious if anyone has experienced this issue, too.

O-cha · 04-22-2009, 11:23 AM

The early coils were a problem, the newer revised ones which are in all z4s are pretty standard.

Swap coils and plugs to 4 and 5 see if it happens again.

JCz04Bimmer · 04-22-2009, 02:44 PM

Ah. I didn't realize that the Z4Ms were getting the new coil variety.

I was going to do that after the second time it happened but I decided to get on the road instead of doing more open track time. I'll just have the dealership replace 'em and see if the issue presents itself again. I have to bring my car in for Inspection I anyway so I'll just let them know about the issue.

F360C · 04-22-2009, 07:38 PM

I had a coil on cylinder 3 go in the fall. I think from now on I am going to start taking the plastic coil cover off for track days to get some extra cooling to them

JCz04Bimmer · 04-22-2009, 07:49 PM

Quote:

Originally Posted by F360C

I had a coil on cylinder 3 go in the fall. I think from now on I am going to start taking the plastic coil cover off for track days to get some extra cooling to them

Is it heat that gets them?

F360C · 04-22-2009, 08:46 PM

I can't remember where I read that but yea thats what I heard. Also every time I see an s54 in race trim they never have the cover on. Maybe O-cha can chime in here?

O-cha · 04-22-2009, 09:16 PM

They have the cover off mainly for access I would bet, not sure if heat kills coils or not, but I'm going to guess no, not at those levels anyway.

To be honest ignition systems aren't a forte of mine, spark plugs I'm much better at.

04-22-2009, 10:56 AM	#1
JCz04Bimmer Captain 32 Rep 606 Posts Drives: 06 Z4MC Join Date: Feb 2008 Location: New York City iTrader: (2)	Misfire on Cyl 1 & 6 Just as the title suggests, I've experienced two instances where both Cylinders 1 and 6 misfire. The engine lugs along and return to normal after stopping and starting the engine. It was caused, in both cases, by an aggressive heel-toe downshift. Has anyone else experienced this? I know ignition coils are a weak point on the S54 so my guess is that 1 and 6 are on their way out. I'm just curious if anyone has experienced this issue, too.
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04-22-2009, 11:23 AM	#2
O-cha Brigadier General 218 Rep 4,726 Posts Drives: Mcoupe Join Date: Oct 2007 Location: In front of you iTrader: (2)	The early coils were a problem, the newer revised ones which are in all z4s are pretty standard. Swap coils and plugs to 4 and 5 see if it happens again. __________________
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04-22-2009, 02:44 PM	#3
JCz04Bimmer Captain 32 Rep 606 Posts Drives: 06 Z4MC Join Date: Feb 2008 Location: New York City iTrader: (2)	Ah. I didn't realize that the Z4Ms were getting the new coil variety. I was going to do that after the second time it happened but I decided to get on the road instead of doing more open track time. I'll just have the dealership replace 'em and see if the issue presents itself again. I have to bring my car in for Inspection I anyway so I'll just let them know about the issue.
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04-22-2009, 07:38 PM	#4
F360C Major 366 Rep 1,373 Posts Drives: E86 S54 Join Date: Apr 2006 Location: Hoboken, NJ iTrader: (2)	I had a coil on cylinder 3 go in the fall. I think from now on I am going to start taking the plastic coil cover off for track days to get some extra cooling to them __________________ 07 Z4 M Coupe AW/IR
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04-22-2009, 08:46 PM	#6
F360C Major 366 Rep 1,373 Posts Drives: E86 S54 Join Date: Apr 2006 Location: Hoboken, NJ iTrader: (2)	I can't remember where I read that but yea thats what I heard. Also every time I see an s54 in race trim they never have the cover on. Maybe O-cha can chime in here? __________________ 07 Z4 M Coupe AW/IR
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04-22-2009, 09:16 PM	#7
O-cha Brigadier General 218 Rep 4,726 Posts Drives: Mcoupe Join Date: Oct 2007 Location: In front of you iTrader: (2)	They have the cover off mainly for access I would bet, not sure if heat kills coils or not, but I'm going to guess no, not at those levels anyway. To be honest ignition systems aren't a forte of mine, spark plugs I'm much better at. __________________
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