Question about 2006 Ford Expedition
Rough Idle usually indicates a vacuum leak. You may have to feel along the lines that are routed in the back. My expedition has a small line that is routed from the PCV valve to the back of the intake where it goes from a small hard vacuum in to a reducer connection. This connection crumbled. The vacuum lines deteriorate over time. Some may not look bad, however they are like a sponge. sucking air the entire length.
I use a propane torch (not lit). Turn on the valve and trace the vacuum circuit. If you have a leak, the engine will rev up slightly when the torch passes the leak.
Posted on Aug 26, 2010
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Posted on Jan 02, 2017
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