1998 Ford Expedition run hard when cold

1998 FORD EXPEDITION
160,000 MILES • V8 • 4WD • AUTOMATIC
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PMH73
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The last 2 mornings, i started the truck and took off.. I've never had to warm up this truck since I got it 6 months ago. It felt like I was giving it had and it wasn't getting it
Sounded like it was growling.. As I drove about a block then it stops
Everything running fine.. But 2 days in a row now
What is it?
Dec 28, 2014 at 10:15 PM
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WRENCHTECH
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Six months ago it was summertime. That had a lot to do with how the truck ran when cold.

Before doing anything, check for any stored codes in the computer and respond accordingly, then try the following..


First eliminate all vacuum or air leaks in the system. You may have a bad IAC ( idle air control) but try cleaning the throttle body first. Remove the intake snorkel, have someone hold the throttle wide open for you and scrub the back side of the throttle plate and surrounding bore with an old tooth brush and some carb cleaner. Be sure to spray some into the small holes next to the throttle plate. That should help stabilize the idle. If it still has a problem, replace the IAC.
Dec 29, 2014 at 2:20 AM