Quote:
Originally Posted by JHZR2
My 240D always has a consistent vibration thats essentially like a tractor. If I put the idle RPMs up more than Id like, its smooth as glass under any condition, hot or cold.
My 300CD is smooth as glass when I start it, and when running any condition. But Ill get a slow oscillation when idling hot, and only when quite hot (think hot day, after a decent load, etc).
I did change the shocks, shock mounts and engine mounts on the 300CD to no success.
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You noticed no difference at all after changing the shocks?
I noticed the oscillation (rough running) after changing my motor mounts. The engine was really wobbling, almost like jelly. After about a week the mounts seemed to settle and the wobbling mostly disappeared.
On a recent trip up north, I was able to fuel up with B20. For the week or so my tank was full, the engine was super smooth –which kind of steers me toward the IP valves and something I read about the viscosity of hot vs cold fuel. Or was it bio being more viscous and coating worn valves better? I'm not standing by that as it wasn't my thinking, but I do find something about that notion compelling.