E-Class (W210) 1995-2002: E 200, E 220D, E 240, E 290TD, E 300TD, E 200, E 240, E 280, E 320, E 420, E 430 (Wagon, Touring, 4Matic)

w210 e320 idle issues

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Old Aug 11, 2014 | 01:23 PM
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2001 MB E320
w210 e320 idle issues

im new to the forum today!
Ive got a 2001 e320 base model with almost 300xxx miles on it. first half of its life was in california all freeway miles ( not driven by me ) i took over the car at 250xxx miles here in utah. No rebuild, everything mechanical is bone stock.

now to the issue. over the past few months or 30xxx miles ago a rough idle began, and this is what ive noticed, idles rough at stop-rpms stoop down to 5-700 while in drive but stopped.
rough idle gets a little better if i put it into neutral while stopped, rpms rise to about 1000.
not sure if

engine mounts?
torque converter?? < probably not
injectors, spark plugs < doesnt seem to be missing and no check engine light
EGR/Vacum system< have had problems with it before.
AGE? lol
A/C issues

I would like to stay away from professional diagnostics simply because they cost a right nut to take your car in and im very capable to do repairs on my own, just not sure where to start, maybe a little insight??
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