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M113 V8 Kompressor Platform Technical discussion relating to models sharing the M113 V8 5.5L Kompressor. Including SL55 AMG, CL55 AMG, S55 AMG, E55 AMG, CLS55 AMG, G55 AMG, SLR (M155).
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Misfire under WOT Help diagnosing

 
Old 01-04-2017, 07:44 PM
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W202 C55 (5.4 swapped C43)
Misfire under WOT Help diagnosing

Hey guys picked up a 2005 CL 55 AMG, only issue is that it Misfires under WOT, if I drive normally there no misfires no CEL and car drives effortlessly, but If I stand on it about 4k rpm is starts to pop and misfire, ive hooked it up to my friends STAR tool and it said there was a misfire on cylinder 1 and 2 so I replaced both coil packs, its better but still misfiring under WOT, any ideas? thinking plugs and wires next.

Thanks for the help
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Old 01-04-2017, 08:49 PM
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2006 E55, 2005 C55, 2005 E320 Estate Sport, 2015 ML350
sounds like you are on the right track. plugs for sure and you can swap the wires too for diagnosis purposes.
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Old 02-02-2017, 04:55 PM
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'08 S-65
I am also having a misfire at WOT in my E-55.

Cylinder #4. Swapped coils for different cylinders. Gave it a coil, 16 plugs, wires... No change.

Fixed vacuum leaks at plenum box for passenger side and did the rest of intake gaskets as the supercharger was off.

Injector has same resistance as the other cylinders. 26.5 ohms if failing memory serves.

Have not swapped injectors with another cylinder. Worth the effort? Idles and runs well aside from WOT.

May have seen a change once while wiggling engine wiring harness. Not certain and am unable to duplicate that.

Are any of you aware of a pattern failure in engine harness or ECU?

Thanks!
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Old 04-30-2018, 09:41 PM
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wrong thread

Last edited by E55Greasemonkey; 04-30-2018 at 09:44 PM.
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Old 05-31-2018, 08:06 PM
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Wrong thread too, sorry
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