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Willis_98GT · Apr 27, 2010

My car has developed a wierd problem.. in the psat i had a h pipe on before i slapped beautiful longtubes on.. anyways longstory short, i bottomed out the pipe one day and it broke a 02 sensor. ever since then the harness has been stripped open where the wires ground out on stuff from time to time, and this used to pop the fuel pump fuse thats in the engine bay (20A Yeller) so i went back threw the harness and sure enough their was wire touching my prochamber causing a short, so i went threw and taped up all the connections and tied it down with the rest of the harness..

and i raped a 3v the other day and popped one.. <-- but when i inspected the harness this time nothing was touching

yesterday i pulled off on a m3 <-- and it popped one. only when i hit 5th gear, instantly

and i changed out three more fuses to finally get it home, without touching the harness at all.

so i guess where im at now is that i ruled out the possibilities of it being related to the harness issue from the past, however later today im going to raise the car up and get under it where i can reinspect everything once again, because it was dark last night when this was all going on and i had a flashlight as i worked.

and my next question is that does this mean that im having fuel issues, since this only happens under wot, and if it helps the battery light comes on almost immediately after the car dies, not before, just after. maybe im about to lose my pump, the last fuse i put in was a 30, i got sick of changing 20s out so maybe this will help out? havent had any problems yet, but ive only driven it for a mile since..

Will

JDwhite98gt · Apr 27, 2010

Dont know too much about that circuit but when Ford put a 20 amp fuse in there it was for a reason, probably because the circuit cant hold too much more than a 20 amp draw. You might risk blowing through the wiring before the 30 amp fuse blows. Just some food for thought. The easiest way to do the repair would be to disconect the trans harness from the main harness, then pull it from the car (it's only about 3 or 4 feet worth of harness), pull off all the wire loom and inspect the wires all the way through for any tears and tape up each individual wire thats cut or broken or has any damage that you can see.

Willis_98GT · Apr 27, 2010

JDwhite98gt said:
Dont know too much about that circuit but when Ford put a 20 amp fuse in there it was for a reason, probably because the circuit cant hold too much more than a 20 amp draw. You might risk blowing through the wiring before the 30 amp fuse blows. Just some food for thought. The easiest way to do the repair would be to disconect the trans harness from the main harness, then pull it from the car (it's only about 3 or 4 feet worth of harness), pull off all the wire loom and inspect the wires all the way through for any tears and tape up each individual wire thats cut or broken or has any damage that you can see.

where does it come out? like up by the bell?

vermilion · Apr 27, 2010

i highly recommend using a multi meter.

duff daddy · Apr 27, 2010

Find out what else is on that circuit, then put a fuse in line then go for a ride and see what part of that circuit is causing the short.

Lee12609 · Apr 27, 2010

fuel pump going south increasing the amperage it draws, much like a fan when the motor starts going bad it will cause alot of draw and usually burn the wiring, connector, or pop the fuse.

no way to really pinpoint this problem online so just throwing out an idea nobody else brought up.

you could hot wire your pump temporarily bypassing the fuse, drive it for a day or so like normal and see how she does, if you do this i'd fuse battery power and a SHORT ground with proper gauge wire (20amp fuse in the battery power side). if it pops that fuse instead of the underhood one you found the problem.

also, does this seem to be more common after a good bit of driving, or will it happen pretty quick???

Willis_98GT · Apr 28, 2010

Lee12609 said:
fuel pump going south increasing the amperage it draws, much like a fan when the motor starts going bad it will cause alot of draw and usually burn the wiring, connector, or pop the fuse.

no way to really pinpoint this problem online so just throwing out an idea nobody else brought up.

you could hot wire your pump temporarily bypassing the fuse, drive it for a day or so like normal and see how she does, if you do this i'd fuse battery power and a SHORT ground with proper gauge wire (20amp fuse in the battery power side). if it pops that fuse instead of the underhood one you found the problem.

also, does this seem to be more common after a good bit of driving, or will it happen pretty quick???

the commonality of it is mixed, it popped cruising and at wot so it seems to have a mind of its own. yesterday i got it in the air and just went threw all of the harness from the bell back and everything seemed to be good just up until the 02 connections, which ive never even used anyways, but i just plugged in the drivers side rear, and the passenger side is my wideband ( i have the plug unplugged because i plan on turning the rears off with a tune anyways very soon)

i went threw and taped up all the ripped wire very well, then secured it very tightly along the trans. its funny how that tranny has little holes and u can make a nice network of zipties to keep it from hitting the prochamber.

i honestly think that its been grounding its self out because along the top of the prochamber (closest spot to the 02 harness) theirs tini spots of burnt rubber where i supposed it touched long enough to burn up the insulation and actually touch the exposed wire, and if my problems continue ill either pull the harness out and just fix it for good, or ill just get a new harness, but like i said it honestly doesnt matter because i plan on turning the 02s off.

ill keep this thread frosty if my problems continue, thanks for everything guys.

JDwhite98gt · Apr 30, 2010

And yes sorry im a little late but the harness unbolts from the main harness right at the back of the engine bay on the pass side.

Willis_98GT · May 1, 2010

cool, well i went threw and took care of all the wiring and ran it a different way away from the prochamber, now im getting a more interesting problem

under heavy load it doesnt hit smooth, it jumps like its losing fuel. so i have another misfire. or lack of fuel, i think im going to run my check engine codes again.

JDwhite98gt · May 5, 2010

wow that sucks, let us know. I think I need a new pump or something too, my car will buck for a second after decelerating from high rpm and then getting back on the gas. Been going on for 3 years and I cant get it figured out.