Dear SLk R710 owners
Hi I just picked up a 1998 230 SLK, and it seems decent, but there is just this
noise I would like to learn more about it, and see if this is also happening to other SLK owner and possible fix.
When starting the cold engine, there is some brief slight rattle from the hydraulic valve lifters, which soon disappears. After that, the engine runs nice and smooth.
After driving 10 to 15 Miles, to warm up the engine completely, this slight clacking sound appears in idle. It reminds me of some VERY subdued dieseling.
When increasing the engine RPM above 1200, the noise disappears or becomes inaudible.
The sound can only be heard from outside the car. Acceleration and overall engine performance remain normal.
Initially, I assumed that a vibrating heat shield between engine and battery compartment could be the culprit, but it wasn't.
I would highly appreciate any help with this issue.