Question about 1989 Mercedes-Benz 300-Class

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3ltr will run OK then cut out (no warning) will start when cool.

0990 300E 3ltr straight 6 will run OK then cut out without warning but will start again when left to cool.

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This problem is caused by a faulty thrust switch which is located on top of the intake manifold where the throttle linkage is located. It is a safety feature which, in case of collision, will kill the engine. This switch can short with age, and in the case of my 1989 300e, would kill the engine on left turns and approaches to a stop light. You can purchase a replacement at autohausaz.com, the part is located under "electrical" category, and itemized as "switch". The proper name is "thrust switch". It costs about $29.00 dollars and takes about ten minutes to replace.

Posted on Mar 03, 2009

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