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Old 05-26-2006, 06:27 AM
Chris Blanchard's Avatar
Chris Blanchard Chris Blanchard is offline
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Join Date: Dec 1999
Location: Cincinnati, OH
Posts: 221
I have a 1992 300TE that I am working on right now - it's been an interesting experience, this is my first MB gasser in many years....

I'd check the vacuum line that runs from the back of the intake manifold to the transmission, since it sounds like you have vacuum problems and transmission shifting problems.

On my 300TE, I located a small vacuum leak in a vac. line that runs underneath the battery (caused by battery corrosion ignored by the PO).

From the picture, it appears that your throttle plate is set so that it is open a bit too much for idle. On mine, there's about a 0.1mm gap between the sides of the throttle body and the plate. Also, make sure the plate is centered.

Since the economy gauge is also erratic, check the vacuum connection to the instrument cluster.
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