misfire
Thread Starter
Junior Member
Joined: Aug 2013
Posts: 33
Likes: 0
S65
misfire
misfire on multiple random cylinders(P0300) both banks.
Coil packs were replaced ~4k miles and 9months ago(I assume they wouldn't go bad that quick)
Ignition module looks to be the newer silver one "A 000 150 02 58 Q1".
The misfires seem to be most prevalent at cold startup but happen at warm idle as well.
Any thoughts? I am guessing ignition module from what I have read. But I am worried the coil packs could have died as well.
Thanks,
Will
Coil packs were replaced ~4k miles and 9months ago(I assume they wouldn't go bad that quick)
Ignition module looks to be the newer silver one "A 000 150 02 58 Q1".
The misfires seem to be most prevalent at cold startup but happen at warm idle as well.
Any thoughts? I am guessing ignition module from what I have read. But I am worried the coil packs could have died as well.
Thanks,
Will
Thread Starter
Junior Member
Joined: Aug 2013
Posts: 33
Likes: 0
S65
It is most noticable at idle as I get a rough idle.
It is also happening at other times as I notice a loss of power and when I come off WOT what sounds like backfires.
edit:
Since you mention fuel. I did have a bottle of techron in the tank. I just filled up with a new tank last night and haven't noticed any difference yet.
It is also happening at other times as I notice a loss of power and when I come off WOT what sounds like backfires.
edit:
Since you mention fuel. I did have a bottle of techron in the tank. I just filled up with a new tank last night and haven't noticed any difference yet.
Last edited by w0ss; Jul 9, 2014 at 08:37 AM. Reason: to edit
Thread Starter
Junior Member
Joined: Aug 2013
Posts: 33
Likes: 0
S65
The check engine light went off today. It seems to be fine now with the new tank of gas. Perhaps it was bad gas or my engine doesn't like techron...
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Senior Member
Joined: Feb 2005
Posts: 254
Likes: 17
From: America
CL600 2003
look at this, yes it is possible to test the ignition module
https://mbworld.org/forums/6125328-post9.html
https://mbworld.org/forums/6125328-post9.html
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Junior Member
Joined: Jun 2014
Posts: 49
Likes: 3
SL600, S550, GLS450
I experienced something very similar. It turned out to be the fuel pressure sensor.
https://mbworld.org/forums/m275-v12-...d-problem.html
https://mbworld.org/forums/m275-v12-...d-problem.html
Newbie
Joined: Oct 2012
Posts: 7
Likes: 0
From: Texas
2004 clk500, 2009 ML550, 2009 CL600
I have misfire on cylinder 11 and 12
My check engine light came on with misfires on 6 of 12 cylinders. I did bg fuel injection cleaner and added BG44k in tank. Cleared codes. All was good for 3 weeks then check engine light came on again. This time misfire on cylinder 11 and 12 only. Also dirty left bank air intake. It is definitely better but car hesitates and check engine light will flash at full throttle. Any suggestions? Getting ready to check fuel pressure
Last edited by quartey01; Nov 8, 2014 at 03:48 PM.
Newbie
Joined: Oct 2012
Posts: 7
Likes: 0
From: Texas
2004 clk500, 2009 ML550, 2009 CL600
Fuel pump
I will look into that. So fat my fuel pressure is only 4 bars or 55 psi. That looks like fuel pump. My fuel filter also looks dirty. I will replace fuel pump and fuel filter and see if that solves the problem. 
