OM642 - Engine bad knocikng - Mercedes-Benz Forum
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post #1 of 3 (permalink) Old 07-18-2019, 02:55 AM Thread Starter
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OM642 - Engine bad knocikng

Dear Members,

I am knew here, so please do apologize me if this topic came up already.

I have a Mercedes W221 S320 cdi from year 2006, and I have a big problem.

After driving 100 km on motorway, I stopped the car and it was very difficult to start again the engine and started to knocking. The first step was to replace 6 injectors (they were leaking), but it did not solved the problem.

Here is a video about the sound of the engine

Even before the injectors have been replaced, we went a few kilometers with the car, at the beginning the knocking was less loud, but then when the engine warmed up it became worse and the engine stopped, and didn't start again. After 1 hour of waiting it started again. During the idle the car is shaking and it lost power. Sometimes it smokes heavily grayish diesel smoke. Do you have any tips?

Thanks in advance,
Gonczy Andras is offline  
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post #2 of 3 (permalink) Old 07-27-2019, 08:08 AM
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Sounds like a lifter ticking, dirty oil causes this clogging most of the time, you could change the oil again with a quality high detergent oil
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post #3 of 3 (permalink) Old 08-14-2019, 08:57 AM
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You need to get plugged into Xentry and read the ECM--It really sounds like you have an injector/cylinder firing out of time or improperly, and your battery voltage seems low as well, the resistance as you start is telling us that.

How many KMs on the engine?
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