Mercedes-Benz Forum - View Single Post - Slight idle vibration (intermittent)
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post #2 of (permalink) Old 02-13-2019, 06:44 PM
BenzWorld Elite
Date registered: Dec 2012
Vehicle: 2003 S430
Location: Georgia, USA
Posts: 2,313
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Get about four feet of 1/4" - 3/8" rubber or plastic hose. Stick one end in your best ear, then use the other end as a probe to listen for the hiss of a vacuum leak. Go all over the top of the engine, and around the engine compartment. Be very careful to avoid moving parts and hot parts! You can tape the probe end of the hose to a wooden dowel or similar tool to make it a little easier to manipulate the probe into tight spots.

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