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Old 09-13-2003, 08:23 PM
bdlefferts bdlefferts is offline
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Join Date: Jun 2002
Posts: 45
I have a '91 190e 2.6 and went through the same thing a few months ago.

After replacing some of the vacuum actuators and the potentiometer like you did everything was holding a good vacuum. The switchover valve was also operating correctly.

However, things still weren't working and I discovered that one of those little rubber elbows that connects vacuum lines was cracked. Check all of yours.

Vacuum supply starts at the intake manifold then runs to a check valve then to a container in the right fender. The vacuum then runs to the vacuum switchover unit which is right behind the rightside vent behind the dash.

I know the system changed alot over the years but that's how mine was set up. Hope this helps.

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