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M113 shaking at idle

 
Old 04-22-2019, 02:55 AM
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M113 shaking at idle

Hello everyone,

I am having some problem with my CLK 500 MY 2005 with 7G. When idle, I can feel some vibrations inside the car. I can feel them through the car body and not through the steering wheel. No codes on SD, I have replaced all sparks and ignition coils, cleaned MAF and nothing has changed. Mechanic has checked the engine and transmission mounts (they are ok), checked the engine compression (its ok). The car has no oil leaks exept one small on oil filter. I am using Motul 5w40, I change it every year (every 5k). I tried engine flush from liquy and molly but it didnt work.

I also can hear some knocking sound in the engine on Passenger side, but I have read many threads about it.

It seems like a missfire every 2sec, but the ignition system is ok and there are no codes. Any ideas? EGR Valve? I can post a video of engine running.

Greetings
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Old 05-02-2019, 02:56 PM
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My guess will be misfires caused by ignition or fuel injection. I have never seen it written anywhere, but from my reverse engineering of Mercedes it's obvious that they use leaky bucket algorithm to trigger check engine light and throw the codes. In other words you can be misfiring at certain frequency which will not show any errors. I've also found a simple way to troubleshoot it - you need the Star system or someone who has one. Go to the Fault Counter for Engine Control Unit. Display in real time "Specified value" and "Actual Value" for all of the cylinders. If the actual values are not 0 but get set and cleared in a few seconds (never accumulate enough to trigger errors), you have a misfire the computers don't notify you about. Good luck and let us know what you find out.
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Old 05-02-2019, 03:03 PM
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And just because you replaced something, it does not mean that the replacement is good. The worst troubleshooting I ever had was when the replacement ignition part was faulty and I never gave it a second look until I checked everything else. Check to make sure that all the connections are good as well
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Old 05-03-2019, 12:44 PM
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Originally Posted by Drolet View Post
Hello everyone,

I am having some problem with my CLK 500 MY 2005 with 7G. When idle, I can feel some vibrations inside the car. I can feel them through the car body and not through the steering wheel. No codes on SD, I have replaced all sparks and ignition coils, cleaned MAF and nothing has changed. Mechanic has checked the engine and transmission mounts (they are ok), checked the engine compression (its ok). The car has no oil leaks exept one small on oil filter. I am using Motul 5w40, I change it every year (every 5k). I tried engine flush from liquy and molly but it didnt work.

I also can hear some knocking sound in the engine on Passenger side, but I have read many threads about it.

It seems like a missfire every 2sec, but the ignition system is ok and there are no codes. Any ideas? EGR Valve? I can post a video of engine running.

Greetings
I have this problem on my C55 as well. Exact same issue, no codes, but something is definitely off about idle. Next thing I'm going to replace is the CPS (crankshaft position sensor) as they are known to be problematic. If you do this, make sure you get OEM Bosch, I've read that other ones from local parts stores don't work correctly. I'll follow this thread closely
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Old 05-03-2019, 01:56 PM
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For me CPS was usually accompanied by hard starting as well, but keep us posted what you discover
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Old 05-04-2019, 10:39 PM
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Would changing the camshaft cam adjuster magnets and/or camshaft position sensors make any difference for this issue?

Last edited by nkx1; 05-05-2019 at 03:37 PM.
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Old 05-06-2019, 11:04 PM
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Not unless you are getting codes indicating they are bad.
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