4.9 EFI engine Idling Very Fast
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Joined: Feb 2008
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From: Pasadena,MD
4.9 EFI engine Idling Very Fast
Changed out the lower manifold on a 4.9, Now the engine is idling very fast - over 4000 rpm. Gaskets appear to be in place and vacumn lines. Any suggestions? If I cover the ports on the throttle body the engine keeps running.
Hotshot
Joined: Sep 2001
Posts: 11,958
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The engine should still run with the throttle body blocked off, because the IAC is allowing a small amount of air in so it will idle. The IAC could be your problem with the high idle. I would think a vacuum leak will make it surge.
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