PeachParts Mercedes-Benz Forum - View Single Post

pawoSD · #33 04-23-2006, 11:01 PM

Quote:

Originally Posted by rg2098

earlier it was said the pop pressure can change the timing as well for an individual cylinder.

Back on this subject, our '83 still idles exceedingly rough, even with the bosio nozzles, would this be a timing issue? We know that the engine has about 2-3 degs of stretch on the timing chain, and its last valve adjustment was probably 12-13k ago. Vibration at idle has recently (within the last few k) gotten a lot worse. Anyone have any suggesstions as to what this might be? Oh, and when in drive or reverse (especially drive) it feels like the engine is stumbling, kindof a "bump....bump....bump...." feeling in the already massive amount of vibration. As sooon as you press the pedal it goes away, and when I was messing with the idle, I set it around 900-950 and put it in drive, and the vibration and bumping feeling went away as far as I could tell, but I could also tell it was idling waaay high, a lot higher than my '82 does, and that one is silky smooth at idle. This stuff has all started happening very recently, so I don't get it. New nozzles, balanced/pop tested, the works, and it also has essentially 0 blowby at all, we started this beast at 12 deg's F with TWO working glowplugs before (50 seconds of cranking) and it started. With all 5 plugs it will start at 0 degrees in about 4-5 cranks. Thats whats so odd, it starts so well in the cold, but idles soooo rough. Why?!

I know you have said yours shakes/idles rough too, maybe its a similar cause? His can't shake though, it seems as if the engine is bolted to the frame of the car, but its on the normal motor mounts. Rev'ing it, it won't "lean" like mine does, and turning it off it barely moves by itself, it just shakes the entire car. Seems like its in there too tight, if thats possible.I know if I grab my engine's valve cover I can rock it back and forth an inch or so, his engine does not move, at all, it moves the car. Seems very strange....