I have a 2005 Mustang GT with a procharger P1SC blower and a 9 pound pulley on it. It has borla exhaust, headers, intake, 3 core intercooler and the plug wires with the coil packs on each one. It has dual fuel pumps as well. Everything ran fine and then recently I didn't run it for a month or so and when I go to get on it, the car will start to almost misfire? It misses and runs like crap at high RPM. Any ideas? Some people said spark plug blowout and I need an MSDS box? I've never needed it before, why now? Thanks for all your help.

 

sounds like maybe a fuel issue to me.
either a partially clogged fuel injector,
or perhaps the fuel filter.


good luck and let us know what it turns
out to be.

 

Did you pull the plugs and see if any were fouled or burned. Sure sounds exactly like a bad plug(s).

Ham's is a good guess as well. I know it's only 9 lbs of boost, but what plugs are you using and what are they gapped to?

 

I have granatelli coil pack connectors. The coil on spark plug connectors. I'm not sure which spark plugs are in there, I'll have to check. I am not sure where the fuel filters are? Are there two, one on the frame and one under the hood? If there is a manual on here I could download it. Thanks for your help, once again all your responses are awesome. Thank you

 

just one fuel filter, it's located on the
underside of the body (drivers side).

modaddicts spark plug idea, seems more
likely than a fuel problem, so that's
probably the place to start.

here is the online manual, for future
projects.

http://iihs.net/fsm/?dir=1

 

well I just pulled a plug...They are the autolite H0's. The one I pulled looked good. I will check the others when I get a chance. When I pulled off the coil pack the wire came out of the boot and stayed on the plug. I tried pulling it and dumb me cracked the graphite/carbon piece around the wire. Not sure what this is for, but I hope its not a huge problem, if so I'll get a new one. So that plug looked good, maybe others are bad, or maybe one of my coil packs is bad. I have receipts of where the original owner had gotten 3 replaced so far. I will check the fuel filter as well. I have put almost 10000 miles on it and not changed plugs or filter, just oil and recharged the air filter so far. Hopefully its an easy fix. Thanks for your help...I usually take a little better care of my cars but being in the Navy on shift work on a sub I don't exactly have the perfect timing for doing things. I'm not neglecting the beast.

 

it does sound like a very minor issue you
have, so be patient and keep notes of what
you do, because it may come down to the
process of elimination.

not sure about the plug boot, you might pm
157db, he is an electrical guru and may have
some advice.

 

thank you, I will pm him and keep going. You will be the first to know when the car wakes up again and will tear through all gears. Thanks

 

one last thing...like modaddict asked, what
is the gap on the plugs....

for my 10psi application, my manual had me
gap them to .032

just something else to note while making your
checks...

 

I found your problem.