This past week I had a problem hooking up a borrowed trailer light wiring. I my attempt to solve the wiring problem I had the lights on for several hours and the next morning my battery really struggled starting the engine,. Before hooking up the charger, I decided to remove the battery cables and clean the posts. After charging the battery over night, when I attempted to start the truck, I would not Idle and stalled. After a few attempts, it would keep running. BUT the first time going down the road it would stall at stops instead of Idling. Now that stalling is coming at random stops instead of Idling
I have ask google what the problem is and it was suggested the PCM had lost the memory for the Idle Air Control Motor. And that the memory would be restored after a few starts. My question is: does that sound right or do I need a new IAC? I check on Amazon and they have a IAC for $12, Should I order and install a new IAC
Thanks for your help with this.
Mel

 

If you change a sensor, use ONLY genuine mopar parts. The aftermarket fellers don't work as well, if at all. (yeah, voice of experience.....)

Try this: Disconnect the battery, turn on the headlights, turn off the headlights, hook the battery back up. Turn the ignition to 'on' (not start), count to ten, don't touch ANYTHING. Start the truck, let it idle until the engine is warmed up. Go for a drive. That *should* take care of it.

 

That sounds reasonable, But what does it do when you turn the headlights switch on and off with the battery disconnected? But I am headed out to do what you suggested. Will let you know the results.
Thanks for your reply
Mel

 

Hey!,,, HeyYou, You be the man! I followed your instructions , waited ~30 seconds, let it warm up to 180℉, took it for a drive into town, made a number of stops, and it performed great. Thank you so much for information and instructions. I'm not sure why it worked, but I'm not going to question it.
Thank
Mel

 

Glad it worked for ya.

The idea is, turning on the headlights with the battery disconnected discharges ALL stored energy in the system, making sure the computer forgets everything it thought it knew about running your engine. Turn the key on, and waiting, gives the PCM to learn the "zero values" of things like the throttle position sensor, and the IAC..... When you start the truck, it will rather quickly learn what it needs to do with the IAC to keep the engine running. It would have eventually learned just by continuing to drive it, but, that can take time, and is rather annoying.