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M157 misfire

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Old Nov 6, 2016 | 01:09 PM
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e63
M157 misfire
Any idea guys?? What is the problem
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Old Nov 6, 2016 | 02:26 PM
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2012 E63
bad spark plug, or bad coil.
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Old Nov 6, 2016 | 05:36 PM
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2014 CLS63 S
Not sure if it cylinder 5 but there is a TSB from Mercedes about leaking cam sensor that gets the injector and or coil harness saturated in oil causing misfire. Should be visible if thats the case.
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Old Nov 6, 2016 | 05:46 PM
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In low RPM the I can feel the engin misfire
but I drive the car the engine is very smooth
above 2000 RPM the misfire is gone
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Old Nov 6, 2016 | 06:15 PM
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2014 CLS63 S
#5 I think is the first plug on driverside when you open the hood. Easy plug to pull. Check the harness going to the coil and injector if all good pull the plug. Maybe as simple as a gap issue or loose plug wire.
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Old Nov 6, 2016 | 06:17 PM
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The mechanic says to do a compression test
he think one of the valves not closing
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Old Nov 7, 2016 | 10:28 AM
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2003 W211 E55, 2003 W220 S600
Originally Posted by mjd222
The mechanic says to do a compression test
he think one of the valves not closing
you need to do a leak down test to confirm a valve issue.

compression test will tell you if the piston rings are good.
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Old Nov 7, 2016 | 10:31 AM
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I don't think it's that Piston rings are damaged
because my car Oil consumption still normal I am not lossing oil
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Old Nov 7, 2016 | 10:51 AM
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Originally Posted by mjd222
In low RPM the I can feel the engin misfire
but I drive the car the engine is very smooth
above 2000 RPM the misfire is gone
pull plug from cyl 5 first and check it out.... mine had same symptoms as yours and it was broken insulator,,, changed plug and everything was fine
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Old Nov 7, 2016 | 12:59 PM
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Relocate Ign hardware
First check the plug, if the plug seem good move it to different cyl.
Move the coil also to a different cyl. Now number 5 would have a different coil/plug and only the injector will remain. If the misfire move to a different cyl you will know what part is bad Coil or Plug.
I do this this all the time to save from not replacing plugs and coils as I service car on the side for fun and to save my customer $.
In this case if it is the plug a fresh set would be installed.
If it is a coil you can install a single new coil but be sure the other 7 will soon start to fail.
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Old Nov 7, 2016 | 01:06 PM
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The coils I change them 6 months ago all of them
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Old Nov 7, 2016 | 01:09 PM
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Did your customer had the same errors And codes ?


Originally Posted by sunil517
First check the plug, if the plug seem good move it to different cyl.
Move the coil also to a different cyl. Now number 5 would



have a different coil/plug and only the injector will remain. If the misfire move to a different cyl you will know what part is bad Coil or Plug.
I do this this all the time to save from not replacing plugs and coils as I service car on the side for fun and to save my customer $.
In this case if it is the plug a fresh set would be installed.
If it is a coil you can install a single new coil but be sure the other 7 will soon start to fail.
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Old Nov 7, 2016 | 01:13 PM
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Originally Posted by mjd222
I don't think it's that Piston rings are damaged
because my car Oil consumption still normal I am not lossing oil
that is why i said to do a leak down
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Old Nov 7, 2016 | 01:17 PM
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Hi
I have a big spacious on valves Are leaking
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Old Nov 7, 2016 | 01:18 PM
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I will take the car to the dealer after tomorrow so they can make the check
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Old Nov 5, 2023 | 10:27 PM
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Originally Posted by mjd222
I will take the car to the dealer after tomorrow so they can make the check
What was the outcome?
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