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HELP truck wont stay running

Joined
September 22, 2014
Messages
32
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0
City, State
Charleston SC
Year, Model & Trim Level
2003 Ford Explorer XLT
Changed the IAC last night. This morning the truck wont hold idle it will start then die immediately. Did I get a faulty IAC?
 



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Put the old IAC back in and the idle roller coasted a bit but then settled out. I think it was BWD who makes it, the valve diaphragm thing inside is a soft material where the stock seems solid phenolic type material, the new IAC seemed to have no spring to it either. I will be taking it back to the parts store after work.

It definitely would stay running or start if I kepty foot on the gas. Problem solved for now. I will do the next swap right in the store parking lot. I scared myself because I was like this is a brand new part, Im an aircraft guy not a car guy, my grandfather was the car mechanic but he is not around any more. I am learning/teaching myself more than any time before how to work on automobile systems with my explorer than any other vehicle I have owned previously.
 






Does the computer have to relearn idle after the IAC is changed?
 












Doesn't hurt to do it. I'd recommend doing it.

Is it automatic or does it have to be done with a scanner? I keep seeing the computer does it on its own when I search the site, but a coworker said he had to use a scanner to do it.
 






Is it automatic or does it have to be done with a scanner? I keep seeing the computer does it on its own when I search the site, but a coworker said he had to use a scanner to do it.

There are a couple of ways to do it, and you don't need a scanner.

1. Disconnect the battery for ~30 mins. Reconnect, then turn the ignition to "Run". Let it sit, don't touch anything. Keep an eye on the Engine icon on the dash. After all the chimes stop, about 30 seconds later the engine icon should start blinking. This is the computer saying hello to all the sensors.

2. When the engine icon stops flashing, start the engine (make sure everything is off...lights, doors are shut, HVAC is OFF, no fan, etc...). Let the engine idle, do not touch the brake or accelerator pedals. After about 3 mins (the engine idle speed should vary while you wait, thats normal), turn the AC to MAX AC. Let it idle for about 3 mins. The idle should vary again as the computer finds the right idle settings.

3. After that, drive the car normally, making about 5 cycles of getting to cruising speed and coming a complete stop.

Then you can drive normally. The computer will continue to learn as you drive.
 






Does the computer have to relearn idle after the IAC is changed?

it will relearn if you disconnected the battery when doing the replacement. it will not relearn correctly if you replaced it without disconnecting the battery. you don't need a scanner to relearn, it does it while you are driving it.
 












Picked up the new IAC the previous new one was definetly bad, no spring in the "plunger" i guess it would be called.
 












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