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Old 04-01-2003, 12:54 AM
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Join Date: Apr 2003
Location: B.C. Canada
Posts: 1
Vacuum leak

Any simple way to check where a leak is? What is a checkvalve,& where is it located. Thanks for any help. Car is a 450SL, 1973.
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Old 04-01-2003, 08:48 AM
I told you so!
Join Date: Jun 2002
Location: Motor City, MI
Posts: 2,741
First, check all vacuum hoses for deterioration and hardening, replace any that are cracked or hard. A good way to check for vacuum leaks is to spray carb cleaner or starting fluid at suspect areas with the engine idling. When you spray in a certain spot and the idle goes up, you've found your vacuum leak.

Or you can use propane. Adapt a long piece of vacuum hose that fits tight onto the head of a propane bottle. Propane is safer to use than spray flammables, but can still "flash", so be careful.
95 E320 Cabriolet, 131K
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