Idle drop

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Jul 26, 2004 | 08:26 PM

radtec

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Joined: Jul 2004

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From: Eureka Mo.

Idle drop

I got one for you guys 97 expedition 4.6 after towing boat in hot weather when I come to a stop at a light the truck will not idle without holding foot on the gas and is skipping bad check engine light does not come on at all. Once the truck gets rolling again it smooths out and runs fine. Has never happened with out towing the boat. Temp gauge is fine and tranny temp is fine.

Jul 26, 2004 | 10:55 PM

buzzard

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Joined: Oct 2000

Posts: 3,960

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From: All over Texas

Two things come to mind, the IAC valve and the throttle position sensor (tps), although most IAC valve problems occur when the engine is cold. Try a search of these two and you'll find a lot of info.

Good Luck.

Jul 27, 2004 | 08:14 AM

NoMo

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Joined: Nov 2001

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From: OK

When was the last time you changed the fuel filter?

Jul 27, 2004 | 09:55 AM

radtec

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From: Eureka Mo.

Fuel filter about 30,000 ago any idea why it would only occur when hot. Any body know what triggers the overheat protection circuit that alternates the firing side and where this sensor is?

Jul 27, 2004 | 10:10 AM

npearman

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Joined: Mar 2004

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From: Birmingham, AL

You may want to check the codes to see if it's your O2 sensors. Had this problem with an Explorer one time. Would only do it when hot.

Jul 27, 2004 | 10:12 AM

radtec

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From: Eureka Mo.

The check engine light does not come on will a code still be created?

Jul 27, 2004 | 10:31 AM

npearman

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Joined: Mar 2004

Posts: 85

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From: Birmingham, AL

no. If the light has never come on, then no codes have been generated. When I read you post, I thought you said the light did come on sometimes. If I remember correctly, my explorer did through a CEL for quite a while when my O2s went bad. How many miles do you have on the truck?