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2003 Ford Expedition Rough idle

Tiny
RALPHNERIN
  • MEMBER
  • 2003 FORD EXPEDITION
  • V8
  • 2WD
  • AUTOMATIC
  • 80,000 MILES
My wife's vehicle, 2003 Expedition, is rather hesitant and idles roughly, especially when it is in gear. It is also particularly noticeable after acceleration. After decelerating to a stop and idle, it seems to almost stall, but it hasn't actually stalled yet. Also noticed that emissions from the exhaust at this time are rather loud, but hesitant. Any ideas?
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Saturday, October 18th, 2008 AT 10:40 AM

1 Reply

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Last tune up with plugs wires and all filters was?
You may have a vacuum leak, get a can of spray gumout, spray the vac lines and maniflod area, when the idle changes, youve found the leak! You want the engine running and spray on the outside but do direct the stream onto the hoses, if it is a vacuum leak, the engine idle will change speed, then you have detected a leak, repair the vacuum leak and see how it runs! If that doesnt do it, you may need a new idle air control valve, it's bolted to the throttlebody.
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Saturday, October 18th, 2008 AT 12:37 PM

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