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M137 CSO valves not working as they should

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Old 02-25-2022, 09:27 AM
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CL 600 '00 5.8L V12
M137 CSO valves not working as they should

Lately I've had some issues with the cylinder shutoff valves. When the cylinders shut down, the valves create an awful noise before going silent. I'm not sure if the latter is related to the car turning the cylinders back on, or if they finaly fall into place.

A video of the noise is attached below.

I've turned off ZAS for now, since that solves my problem, but as gas prices are sky high, I'd like to turn it on again 😂
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biker349 (03-02-2022)
Old 03-02-2022, 02:46 AM
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Update; I did some research on ZAS, and when looking at mbepc.net I discovered the following:
https://mbepc.net/1/fg/cl/68s/215378/0/80/032

The ZAS system is operated by a vacuum system. I've got vacuum leaks on my car and ZAS is not working.
1+1=2?

ZAS was working flawlessly before and now it isn't anymore.
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biker349 (03-02-2022)
Old 03-02-2022, 12:23 PM
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wait you turned the ZAS system off in the post #1 above? Is it back on and still not working ?
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Old 03-02-2022, 12:47 PM
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I turned it off, to test if the rattleling issue went away, which it did.
Then the car ran perfectly smooth, so I turned it back on and it started to rattle again. So I turned if off again and then I came across that diagram
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biker349 (03-02-2022)
Old 06-12-2022, 05:15 AM
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Any suggestions?

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