The Engine Control Fuse 1 is in the PDC under the hood, it cuts power to the Ignition Coil for sure, and I think it cuts power to the fuel pump, but I have the stock fuel pump wiring bypassed. So for me, it cuts power to the ignition coil, therefore no spark and no start. The starter and fuel pump function just fine.


Drove the Jeep for over a year, without issue.

Then the fuse blew a while back and I replaced the CPS thinking it was that and eventually found out it was the fuse.

I replaced the fuse and drove for a few weeks and it died again.

Replaced it again and drove for another few weeks.

Replaced it again and drove it until tonight.

Replaced it with a 50 amp fuse(should be a 30 amp) because all the auto parts stores were closed and we had one of those(they're the big honkin' ones).

It started up and ran for about 2 seconds and died.

Smelled burning, and the fuse was blown.

Any frickin' ideas?

 

you got a wire shorting out somewhere. and as far as running a 50 amp fuse in a 30 amp fuse spot your gonna be burning some wire doing stuff like that. but as far as where the short is i couldnt tell you any good spots to look just start tracing.

 

Heve you got a wiring diagram? If not secure one. They are posted on PBB and trace the possibilities. As slowfreefall suggested there is a shor somewhere on a ground that has failed causing it to draw more current to seek the missing ground.