2005 C55 amg misfire 5 and 7 - Mercedes-Benz Forum
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post #1 of 1 (permalink) Old 09-12-2017, 02:15 PM Thread Starter
BenzWorld Newbie
Date registered: Sep 2017
Vehicle: Mercedes C55 AMG
Location: JHB South Africa
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(Thread Starter)
2005 C55 amg misfire 5 and 7

Hi my first post as a recent owner of a C55 amg, need some urgent help

I have a C55 amg I recently purchased. It was smoking when I got it and had an engine overhaul done where I replaced valve stem seals and piston rings. Otherwise car was running ok. Both Cats removed hence just resonator and boxes on the rear. CEL has been disabled by previous owner, think it is a software mod.

Anyhow got the car back a few weeks ago and felt that it was under powered and shaking on idle. Plugged in an OBII and found error of multiple misfires on 5 and 7.

Have taken it back to mechanic whos checked - coils - swopping, leads swopping and spark and replaced plugs still no luck,

Any ideas. Please help
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