PeachParts Mercedes-Benz Forum - View Single Post

JHZR2 · #4 08-29-2010, 08:56 PM

OK, I am getting to my wit's end...

I have a gold rack dampener.

When I set the idle right and mess with it, I cannot for the life of me get the car to not lope at idle. Even with the RD all the way in.

I have tried to take the idle all the way down, disconnecting the linkage and unscrewing it. At some point just barely north of 500 RPM, the engine gets real smooth, no loping at all, even with the RD in an odd position.

However, with the idle low, two things happen - the engine bogs down pretty bad when something occurs such as shifting from neutral to drive or the AC kicking on, and when it recovers, it goes through a cycle up and down a number of times as the governor tries to get it back to normal.

At regular idle speed the odd things do not happen, however no matter where the RD pin is, including all the way in, the engine shakes pretty bad.

Engine mounts have less than 2k on them, and they are OE from the dealership. Valves adjusted at the same time. Injectors rebuilt and pop tested less than 1k ago. All of this was PM and part of other jobs like oil cooler lines - not really chasing the shake... It is just that now I have a hot idle shake that is my point of annoyance.

I can see the engine shocks flexing their mounts, but this is a pretty bad shake... That said, it is ONLY at complete, absolute idle, in neutral and AC off. As soon as some slight load occurs, like it is in D or the AC kicks on, it is smooth.

So what happens when your rack dampener is all the way in and you just can't get it right? Any reccomendations for how to get back to square one?

Thanks!