2007 S550 W221 Misfire under load
06-05-2024, 01:44 AM
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2007 s550 4matic
2007 S550 W221 Misfire under load
Hello, new member to the forum. I recently purchased a 07 s550 W221 with the M273 motor. This car has no problems starting and even idiling for an hour or more. It even revs fine when in park and not driven but as soon as you drive it over 2k rpms the CEL light flashes and it starts to misfire until you turn it off and back on again to reset it. Only codes i have on right now is the Cylinder 8 misfire. Did a compression test, sparkplugs, coils and even an injector. Nothing changed. Any ideas or help will be appreciated.
06-05-2024, 06:26 AM
#2
check other related posts in the last few weeks
there is one specifically about cyl 8 and resetting adaptions with dealer kit allegedly sorted it - but an EML isn't part of that story
coil sticks die all the time
CPS dies every 50k miles
ECUs are getting old and a few have started having issues - deliberately cooking capacitors with engine heat was designed in obsolescence - heroes can replace them for peanuts (but charge lots)
there is one specifically about cyl 8 and resetting adaptions with dealer kit allegedly sorted it - but an EML isn't part of that story
coil sticks die all the time
CPS dies every 50k miles
ECUs are getting old and a few have started having issues - deliberately cooking capacitors with engine heat was designed in obsolescence - heroes can replace them for peanuts (but charge lots)
