Date registered: Nov 2005
Vehicle: 1982 300TDT 150,000 miles 1985 380SE 130,000 miles 1991 560SEL 81,000 miles (a/k/a the nightmare)
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You'd do best by pulling the dash, and getting replacement diaphragms for your pods through George Murphy at Performance Analysis Company in Tn... (He supplies a sheet that outlines the way to test the pods once they are installed, and the same procedure could probably be used to troubleshoot the vacuum system... but by the description of your problem, sounds like you'd be better served taking the dash out, as I believe you'll find more systemic problems... also, if sometimes it's best to change all relevant and known failure points of the system (within reason and cost effectiveness) at this stage of the game).
While you've got the dash out, you can change all of the rubber bits that will fail sooner or later, and check your vacuum switchover valves and replace. I don't think there is any easy way to diagnose your problem.
"I don't think it's nice, you laughin'. You see, my mule don't like people laughing. He gets the crazy idea you're laughing at him. Now if you apologize, like I know you're going to, I might convince him that you really didn't mean it."
"I love the smell of diesel in the morning... smells like... like victory"
Last edited by to loss; 04-12-2008 at 08:53 PM.