Got handed a 2003 F-150 with a misfire that took me 4 hours to find

Customer brought it in last Thursday, said they changed plugs and coils already. I checked compression, fuel pressure, even ran a power balance test - nothing. Finally pulled the wiring harness apart and found a chafed wire under the intake manifold where the harness rubbed against a bracket. $12 fix after 4 hours of labor. I bill by the job not the hour so I ate that time. Has anyone else run into dumb hidden rub-throughs on these trucks?

2 comments

2 Comments

sullivan.abby1mo ago

Used to think those harness rubs were rare... this changed my mind for sure.

sullivan.piper1mo ago

Wait, you mean the fur actually rubbed off down to the skin? I thought that only happened in really extreme cases or with poorly fitted gear. I've had a couple of dogs with sensitive spots before but never anything that bad. @sullivan.abby that photo you shared was honestly hard to look at, I can't believe how raw it got before anyone noticed. I guess some breeds with thinner coats or short hair are way more prone to it than I realized. Makes me want to double check every strap on my own dogs right now just to be safe.