Two days ago my amp gauge went low, my battery died. My battery was good, so I got a tow to my buddy's house so I can work on it. I bought an alternator yesterday and put it in. The truck wouldn't start. Before this, I had been gettin a check engine light for the o2 sensor, I think its was p0420 something like that. It was the front bank. So I bought that this morning thinkin it would fix the problem. I installed it and the truck still wouldnt start, check engine light on. Read the code and p1389 popped up.. I read someones post n it said switch the asd relay in the fuse box with the wiper relay. I did that, cleared the code n still nothing.. The truck will start, with starting fluid, n it will run with some gas. But the truck WONT IDLE.. idk what to try next, PLEASE HELP=(

 

If you step into the gas pedal a bit, will it start and run? May need to clean the throttle body, and let the PCM re-learn idle.

 

Yepp.. and if I put it in gear while its revving and drive it a lil, if will idle by itself. But the check engine light stayed on and once I shut it off, it wont restart without the help of starting fluid again

 

What codes are you getting?

 

So, I finally gave in and brought the truck to a shop. They called me n said the pcm harness had melted and its fried. They seem to think that when the alternator went, it spiked n sent a surge that melted it.. I dont know if that is possible, all I know is I dont want to buy a new pcm and have it melt again.. I got a new harness from the junkyard, but they didnt have any matching pcm's for my truck. It is 111AE.. does anyone know where to get the best deal on an already programmed n flashed pcm? Ive found a few places online for around $250, but I also want some insight from anyone thats been in this position...

 

That's about standard price. Get one from a local parts store. (if the price is right in that neighborhood), that way, if there is an issue, you can talk to someone face to face, not over the phone....

 

I wish there was a way to attach a pic to the post, cuz I took a picture of the harness that plugs into the pcm.. its the one on the side with the two mounting bolts, not one. Its black n grey.. its melted a lil bit, and one or two of the pins are broken inside.. whats my best way to fix this? I can go to the junkyard and find a new harness, but theres about thirty wires and they have pins attached.

 

Host pics someplace like Photobucket, or Imageshack. Then you can use the image tags to have the pics show up in your post. Space for hosting pics here on the site is extremely limited.

There is a neat little tool for removing the wires (with the ends still on them) from the connectors. Not sure if the parts stores would have 'em, but, seems like a reasonable proposition, might give 'em a call, and ask.... If you can get one, then just change that connector. Pic one up at a yard, and then just do ONE wire at a time...... Tedious, but doable.