2007 crown vic 4.6 l idles high on startup

Long High idle after start up - YotaTech Forums

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Dec 20, 2011 - aviator's Avatar ... When the high idle is no longer needed the piston retracts and the throttle ... Sometimes the piston gets gunky and slow to react... clean the ... you are already idling higher then normal the idle up will only be worse... for ... it takes to kick down when I first start it up, high idle is at 2200 RPM it ...Missing: lincoln

High idle at start up - F150online Forums

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Oct 27, 2007 - ... King Ranch · Lightning · Lincoln Blackwood & Mark LT · SuperCrew · SVT ... my 2000 when its been sitting goes up close to 2k then drops down in seconds. ... so what your saying is when it's cold outside I can expect it to start andidle at 2200 rpm. sounds pretty off to me. ... Vehicle: 2004 Ford F150 5.4L. 4.6l Intermittent High Idle. Why?
Jul 12, 2005
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Jun 29, 2001
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Sounds like a typical failure for an idle air control.

I'd recommend sticking with OEM, my experience with Chinese IACs is mixed at best.

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.

concerned about nothing
the ECM sets the high idle rpm on starting so that there is sufficient air / fuel mixture to keep the engine running while it does a tune up and checks all the sensors
when the sensors are all reporting within parameters , the idle speed will drop back
should settle at around 850-900 rpm
as for the fan noise
if you have a viscous fan hub( not electric ) that is the fan locked in high temperature mode and will stay there until the liquid silicon is pumped back into the reservoir
usually takes about 1 minutes and indicates a properly operating fan
as the silicon is being pumped back the fan rpm slows down with a reduction of fan noise
If anything raises your concerns , you have an on board fault recording system that you can access at any time using a scan tool
get in the habit of having the fault codes read at each service or when you feel something is wrong as it will save you lots and lots of cash by not guessing repairs

check air flow meter sensor

have a 97 crown vic,
in warm weather it idles fine and run fine
now that its cold I have to hold at high idle to have warm up
for about 10 mins.
if I just start it the engine will die with out me holding on foot on the gas

Do you have a check engine light on? First thing I would do is unplug the IAC motor when the engine is warm. If the idle speed doesn't change you have a vacuum leak or a bad IAC motor. If the idle speed goes down you might have a bad TPS or IAC

Idle control valve,very easy to replace

check idle speed control make your throttle valves not stuck.check for vacuum leak around the throttle body area look for broke gasket.

I just came up with that exact issue in my 2003 with 98K police crown vic. And the last time I had this issue in a 2001 police Crown vic it was the crank shaft position sensor. A $20 part and about 30 mins to put it in. located near the bottom of the engine. I had to un bolt the A/C compressor and push it out of the way a few inches to get to the sensor. If you have about 100K mile on it and its an idled heavy police car, this sensor should be changed out anyway. It can leave you on the road dead and some dealers have a hard time find out whats wrong as the OBD 2 does not see it as a problem when it goes bad or becomes touchy as I think mine is.