pcm fuse keeps blowing every time i try to start my truck anyone have any sugjestions

 

What year truck do you have?

 

In addition to the truck info requested above.

1. Which PCM fuse ( there are a few fuses related to the PCM ).
2. Is the same fuse that has been causing you problem since OCT-09.
- Went looking to see if you had another post with the info, and found the same thread from some time back.

 

i have a 97 f-150 4.2l engine it is fuse 24 in the engne compartment and yes it is i took out the pcm last time and put back in and that worked untill yesterday the fuse seems to blow only when i turn the key to start. if youjest turn it on it will not blow seem like a dead short but i cant find it. any help would be gra=eatfuly apprecated

 

Last thread a member had this symptom, it was the HO2S wiring, where it went past the exhaust on the passenger side

The wiring loom was melted, and would short against the exhaust. Took him some time to track it down, but it found the insulation was pretty shot, and had to be patched with new wire, then put it in new corrugated wire loom, and tie it back, so it would not happen again.

Pictures of where his was shorting at:





This was on a 1998 MY truck, which is in the same series as your 97 MY.

 

ill look at that and let you know what i found thanks for the info

 

checked the wire harness and sure enough it was fried choese to replace te harness rather than splice to many wires burnt thank you for the help you saved me a lot of agravation

 

If you see his post some time, thank the member that did the leg work on checking almost everything from fuse #24. Wish I could recall his name right now.
He is the one that did all the hard work.