My engine (5.4) idles at 4-500 rpm's sometimes. It should run at 6-700 rpm's to keep it running. Have anyone experienced the same problem? Seems like there is some type of switch that works sometimes to up the idle speed.
I would like to know if I can fix the problem without sending it to the dealer? $$$$$. If you know what I mean.

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had a similar problem on my 97 4.6L xlt--get service manual(non-factory) at an auto parts store unless you know about the IAC(idle air control). carefully clean it and the throttle plate--NAPA/3m has a spray cleaner that is supposed to be ok for throttle bore/plate cleaning.

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2001 Lightning, silver, escort 8500, ranger 2950dx dual band radio, wilson 2000 ant., bot/picked up on 05/08/01, 1997 f150 xlt 4.6L 4x2 with: a/f one fipk, superchip, optima battery, bbk 75mm throttle body, edelbrock ias shocks--2001 lightning to come(she came--see above)

"nothin' but a bunch a low-life white trash drinkin' too much cheap alcohol"

"I don't take s**t from guys who drive Lightnings," the cop said. "You're speedin' when you're sittin' on the parkin' ramp."

 

I have the same problem and its driving me nuts--check my last post-page 2 under engines>low idle-engine miss-you can see all the things i've tried-I put on a new EGR valve and coil pods-neather worked-I'm going to try a set of plug wires next but, it shouldn't be that(their new).

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98 f150 4.6 auto 4x4 supercab-short box/bright red & black/6 disk cd changer/ dynomax cat back/k&n fipk/super chip/lund taillight covers/factory fog lamps/Ford mud flaps/pace edwards box cover/ultra wheels/LT265-75-16 BFG/ westin nerf bars/steel horse billit grill & bumper insert/reflex shocks/bosch plat. plus 4/accel wires/auto start/left hand grab handle/2001 lighting headlamp and corner lights/2002 Ski-Doo Summit 800 High Mark X

 

 

L, the IAC I believe is located behind the throttle body under the back wiper cowl. Is this correct? How did you get to this device without being a minature type person?