F150 Idling problems


Old 07-23-08, 09:02 PM
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Question F150 Idling problems

Hey everyone, I own a 1998 F150 single cab 4.6 L . It just rolled over 150,000 miles and im in debate on selling it rite now but anyway its been well taken care of yet recently i encounterd a problem, when i start the truck up it idles up then rite back down shutting off, however if i start the up and apply the gas pedal a little it idles fine but shuts off after i release the pedal, but finally if i start the truck up and apply the gas pedal untill the truck warms up and take my foot off the pedal the truck idles fine. Only happens on cold starts, when the truck has warmed up it starts up fine. Any clue as to what it could be???
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Old 07-24-08, 05:57 PM
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We are very cluey here.

Probably the water temp sensor - pretty much text book symptom/fix.

Last edited by marbobj; 07-24-08 at 06:15 PM.
Old 07-24-08, 06:31 PM
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A can of 3M throttle body cleaner, a brush, and a little elbow grease should fix er up.............Check the vacuum elbows for leaks too....
Any Check Engine Light on???
Old 07-24-08, 06:51 PM
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not a throttle body problem it is a temp sensor problem or a idle air controle motor is not working properly.

Murphy was an optimist
Old 07-24-08, 10:25 PM
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Talking Hey

Hey every1 thanks for the help i got her fixed today, and no the check engine light did not come on while it happened so not sure about that but goodnews is i did find the problem, it was the idle air control sensor on top of the intake, simple 10 minute fix, thanks again for the help guys

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