George Larribeau wrote: > Runs rough at idle extra noticeable when cold. Seems to be happier above > 1100 RPM or so This RPM is a bit higher when cold. It is better after I get > it on the 'Freeway' it gets up to operating temperature. The idle speed > could be a tad lower that I remember but it is, it would be a hair. When it > is at it worst it makes the hood noticeably vibrate and there is a low > frequency shaking. Some vibration induced buzzing noises inside the car. > When I open the hood it doesn't appear to be visibly vibrating all that > much. Does not take much throttle to get it to clear up (under load)
I'd make sure the motor mounts and tranny mounts are in good shape (as others have already suggested). I would also suggest loosening a nut on each injection line one at a time to see the change in idle on each cylinder. If one cylinder decreases the idle less than the others that cylinder has something wrong with it and you can narrow it down from there. If they are all about the same then you can start to look elsewhere. Has anyone been fooling around with your injection pump? Do you use WVO or SVO? A possibility is the rack damper bolt on the back of the IP, but, if it was mis-adjusted or worn out, I think you would see the engine visibly rock (its been like that when I've adjusted mine). I had a problem on my '79 W116 300SD that caused the entire front end to shake when it was in reverse (you could literally see the front left wheel shake). It also had a low frequency noise that came from "everywhere" (ie, it didn't come from a single direction). It turned out that there was a different engine, with a different upper oil pan that was hitting the front sub-frame. This shouldn't be the case with your car though :) John _______________________________________ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
