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2003 Ford Expedition Question: Rough Idle stalling in turns, Leaps forward when I stop sometimes.

 

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RAnthony80, 4.6L V8, Tampa, FL, June 16, 2010, 21:04
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My Excursion has a Rough Idle. Sometimes when I am stopping It will lunge the SUV forward. I tried to Replace the Brake Booster which was bad but it didn't stop any of the problems. Any idea what the problem could be?

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  • Answer #1

    bmdouble August 14, 2010, 09:10
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    most commonly,vacuum leaks are very notorious for these concerns.get access to a good scan tool to monitor your fuel trims.a positive 15% or above fuel trim usually indicates a pretty good vacuum leak.check your pcv tube attachment at the back of the throttle body.write back after you try this and I will be happy to help.

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  • Answer #2

    Joe Book June 03, 2012, 14:38
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    Check fuel pressure. Some models of the expedition tend to stall when making a left hand turn and fuel is below 1/4 tank due to faulty fuel pump.

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