I have a problem with the tranny fuse I hope you can help with. My L is 2004 W/1050mi. perf mods psp predator w/street tune, 4# lower pulley, JlP ram air, Ftvb, magana flow catback.
I installed the exhaust and took L for a test drive I did a short burnout rolled out went about 100' went wot L started to slide so let up a little just before shift to 2. The L went into 3rd and hego light started flashing. I shut truck down and restarted engine then had ck engine soon lgt also. I limped home got on f150 forums and was advised to ck tranny fuse and o2 wiring underneath. the fuse was blown but all wiring was fine no rubbing, loose , pinched, or burnt wiring. ck'd codes with the predator and it said no abnormal codes for a tuned vehicle but when I started the engine it listed like 15 different things.after changing fuse everything worked fine I cleared the ck engine lgt with the predator. then I tried the burnout again I let off just b4 shift to 2 and fuse blew again. I replaced the fuse and everything is ok again.
Before I got on the forum I thought it was the ftvb but now I have no idea whats going on. could the engine be pulling burning gasses from the new muffler into the o2 sensors and shorting them. This all started right after I installed the exhaust it really stinks burning the new off. Again All wiring is good o2 sensors were not hit or damaged during the change. I also now see another guy had the same problem at the track I'd sure like to avoid this happening again as I was getting ready to race