Cl 500 misfire check engine

LostKiwi

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Well well. The CL was released with the M119 but changed to M113 in 2001.
Indeed you are correct his is an M119.

R129 swapped in 1999
 
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Andrew jones

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Hi everyone
Recorded misfires are on cylinders 3,4,5,6,8
Codes are
P2050
P2052
P2053
P2056
P2058
P2043
P2045
P2046
P204b
P2055
Thanks for all you help
 

bembo449

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that's quite a list pal but much better for someone to get a better idea of what could possibly be at fault
 

LostKiwi

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Interesting. Firing order is 15486372.
The misfiring cylinders are all sequential. The non misfires are also sequential. I wonder if there's a clue there?
 
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Andrew jones

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I’m affraid it’s beyond me
I sent Ecu for testing and they said they found no faults but this only misfires when you try to drive it
It isles and revs perfectly when stationary
I’m still wondering if it could be Ecu
 
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Andrew jones

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I may have led you wrong
The order the faults are listed are :
From top to bottom
5,4,3,8 ...5,4,8,6
 

LostKiwi

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I'd be more inclined to think MAF from your description but I'm curious about the way the misfires happen on a sequence of the firing order.
 
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Andrew jones

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I did already change the maf sensor the symptoms remained the same
I also followed recommendations of trying to run open loop and disconnected the 2 front lamda sensors but again symptoms were the same
 

Craiglxviii

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Well well. The CL was released with the M119 but changed to M113 in 2001.
Indeed you are correct his is an M119.

R129 swapped in 1999
Mine is a 2000 car with an M113...
 

Craiglxviii

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I'd be more inclined to think MAF from your description but I'm curious about the way the misfires happen on a sequence of the firing order.
Remember my problem? The intake manifold had to come out in order for it to be exposed... and it was similarly non responsive to all initial diagnostics.
 

Craiglxviii

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It is the M119, but that also has no dizzy cap and isn’t overly prone to biodegradeable engine looms.

Aftermarket HT leads could be a good shout however. I’ve heard of this issue in the US...

Sorry I meant the 113!!! Typo!
 

ajlsl600

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get it back on star and go from the begining again . it is possible that yr eforts to date have wallpapered over the origional issue
. i would do this before i spent any more cash , save faults list before you clear them , or use yr mobile to photo faults list .
could that be a faulty MAF trying to run on corrupted parameters (limp mode), good enough stationary, no load but crap when driven, there should have been an error code for that tho . . http://www.benzworld.org/forums/w163-m-class/2909010-p2050-misfire-but-cant-find-issue.html

maybe above throw some light on possible issue
 

LostKiwi

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Have you tried clearing the adaptations (long and short term fuel trims)? Take note of them before hand as they may also give a clue.
 
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Andrew jones

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No I haven’t , are you Able to explain more ?
Many thanks
 

LostKiwi

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The ECU writes adaptations to memory as a learned starting point for mixture and timing determination. If it had a previous condition which required adaptations to be significantly off norm and the work you've done has corrected it the opposite way they learned settings may cause it run poorly and be unable to learn new setting needed. Clear the adaptations (it will reset it to factory) and it will relearn as required. It at least removes one factor.
 
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Andrew jones

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Thank you very much
 
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Andrew jones

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The ECU writes adaptations to memory as a learned starting point for mixture and timing determination. If it had a previous condition which required adaptations to be significantly off norm and the work you've done has corrected it the opposite way they learned settings may cause it run poorly and be unable to learn new setting needed. Clear the adaptations (it will reset it to factory) and it will relearn as required. It at least removes one factor.
Can’t thank you enough for sharing your knowledge , followed your instructions and my car is now fixed and it cost me nothing
Thank you so much
 

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