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Old 07-19-2010, 09:34 PM
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Join Date: Jul 2010
Location: South Carolina
Posts: 8
1975 240D Problem

First time post. Drove my 1975 240D to work today, no problem. Went to start it up to leave at the end of the day and the car smoked bad and idled real fast. The car acted like it was stuck at half throttle and smoked bad (white/blue smoke). Any ideas on my problem. I believe the IP diaphram is bad/

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Old 07-19-2010, 10:36 PM
diametricalbenz's Avatar
The Crowbar of Embriage
Join Date: Oct 2004
Location: Marietta, GA
Posts: 3,511
Do you have any vacuum left in the door locks or the brake booster?

It sounds like a vaccum pump diaphram tear which has happened with both of the W115's I have owned. It will smoke like crazy and even worse when you accelerate or decelerate in gear causing a bump in the manifold vacuum causing a huge smokescreen behind you evidenced by the honking and finger gestures of the people behind you.
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Old 07-20-2010, 11:24 AM
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Join Date: Jul 2010
Location: South Carolina
Posts: 8
When I started the car it smoked like crazy and ran sort half throttle and like it was missing. Once I get it home, I will pull the vacuum pump. Any thing I should know bwfore I pull the pump?

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