W463 Who knows how to check vaccum leak - Mercedes-Benz Forum

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post #1 of 2 (permalink) Old 05-21-2009, 04:04 PM Thread Starter
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Unhappy W463 Who knows how to check vaccum leak

does anybody knows how to find vaccum leak, on 2002 5.0L .I have everything changed from sparks,fuel filter,injectors cleaned ect. to comp. diagnostic. show no resoult for my random shakes , It has to be vaccum leak but were?

G500 02' 79 000 miles
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post #2 of 2 (permalink) Old 05-23-2009, 04:45 PM
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A vacuum leak is certainly suspicious, however, you must make sure there is a leak. What is the vacuum reading at idle? If you are seeing <20 in-hg vacuum, there is probably a leak, like a cracked line. Just remember, patience will find it.
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