Question about 2005 Ford F-150

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Idle problem idles fine until you slow down and then the rpm drop really fast down to about 250 rpms and if you happen to be turning it can kill the engine when in park its fine and doesnt seem too have lost any power

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  • m-2be1ask1 Dec 17, 2008

    idle up and down in park and drive

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Iac motor sounds like its gone bad

Posted on Nov 11, 2008


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1997 acura cl 2.2 revs up to 1500 rpm and down to 1000 rpm just several seconds after start


Cars are design to run at a higher idle at start up to warm them up quick. There is a sensor that reads water temperature and tells your car's computer how fast to idle. Your RPMs seem slightly high but not out of the norm. Does idle ever drop to around 600/800 after about a minute? If not, your engine temperature sensor maybe defective.

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2008 pt cruiser problems. At idle with Air Cond on get frequent RPM drop. 50-100 RPMs. Withour Air Condition on car idles fine (no drop) Also can hear a single click sound when drop occures.


The click sound would be the air conditioner compressor engaging, the engine will slow down do to the additional load. If it idles rough you probably need to think about cleaning the throttle body.

Oct 04, 2012 | 2008 Chrysler Pt Cruiser

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Engine idles rough at red lights begins loping rpms drop to almost killing, then cycles back to normal, then repeats rough idle drop in rpms and loping, back and forth until I rev engine or take off


You could have a clogged fuel filter, if you haven't changed it in awhile. You could have a leak in the intake system somwhere also. When you slow down, you get less power to the engine. It may need spark plugs and wires as well, if in need for a tune up.

Mar 02, 2011 | 2001 Nissan Altima

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My 1997 Chrysler Concord idles at 2500 to 3000 rpm when first started and when it warms a little it idles at 2000 rpm and stays there. When I start it right after I turn it off, it starts at 2500 rpm then...


Maybe a short to the TPS or something shorting it out. There's also the IAC that really controls the idle but usually it will cause the RPM's to go up and down a little erratic if bad. The MAF sensor can cause major problems as well but since you already swapped the TPS and it helped and then stopped I would focus on that sensor and especially it's wiring to and from the ECM. Be careful with the sensor signal wire to the ECM can blow it if more than 5v passes or spikes.

Sep 03, 2010 | 1997 Chrysler Concorde

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84 toyota pickup will not idle just happened on the way home from work, runs at higher rpm turns off if idling


have your TPS sensor looked at since that controls your idle and rpms. It sounds like it's causing your rpms to drop too low

Aug 21, 2009 | 1984 Toyota Pickup Deluxe

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Rpms fall when backing off on throttle


engine speed sensor may be faulty

Jul 19, 2009 | 1996 Subaru Legacy

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High idle 1997 Madza 626 4 cylinder auto transamission


Idle control valve...

HIGH DOLLAR PART, 400 to 500 smackers....

You can try cleaning it, I beleive that is the same 2.0 liter motor they put in the ford Probe? I could be wrong, I know they 2.0 has issues with the idle control valve..

Anyway, if you want to try cleaning it, try this link... its to a Probe, but should be the same as yours...

http://www.geocities.com/adamk01452/IAC_Clean.html

If its not the same as that, you can probably search the net and find a site specific to your car... but it really should be the same motor, even the haynes manual for the Probe has sections for both the Probe and 626 in it...

Good Luck!!!

Apr 22, 2009 | 2001 Mazda 626

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