1999 Ford Expedition

1999 FORD EXPEDITION
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NOBLESHORSE2
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  • 1 POST
Engine Mechanical problem
1999 Ford Expedition All Wheel Drive Automatic 147000 miles

Truck stalls when idling in park or stopped ,in drive (for example, at a light)
Jan 29, 2010 at 12:37 AM
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MERLIN2021
  • ✓Experienced Mechanic
  • 17,250 POSTS
Get a can of spray Throttle body cleaner, start the car and spray around, pay attention to vacuum lines and manifold, if the idle changes, you found a 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!

The other possibilty is the idle air control, it,s bolted to the side of the throttle body...
Also check the PCV hose, they tend to dry out and allow air leaks, test the same way.
Jan 29, 2010 at 12:40 AM
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