[dsaleen2002]

HEY GUY --NEED ALITTLE HELP
OK IM LISTING WHAT I GOT:
5.0
GTP40 HEADS AND HEADERS
TK500 TRANS
6AL MSD ((( PIH CONVERSON KIT TO 93 COMPUTER))))
42PS INJECTERS
AND ALOT MORE PLUS CHIP GOT IT TUNED BY LAROCCAS
WELL THIS IS THE DELEMA???
CAR RUNS MINT..
THE PROBELM IS WHEN 1ST STARTING IT IT STARTS FINE BUT WHEN DRIVING IT TO 2500 RPMS ITS OK BUT BEYOND THAT SEEM ITS HESITTATING THEN IT CATCH 4000 RPM AND IT OK AGAIN BUT IT HAPPENS FOR THE FIRST 2 MIN OF DRIVING THEN IT WONT DO IT NO MORE UNTILL YOU MAKE IT REST TILL IT COOLS AGAIN ((( THAT 1 PROBLEM )) 2ND PROBLEM IS AFTER WARMED UP AND UR IN SECOND GEAR AND DRIVING NORMAL IT OK, BUT WHEN U DECIDE TO FLOOR IT TILL 5K THEN SHIFT QUICK LETTING GO OF THE GAS THEN FLOORING IT AGAIN TO 3RD THERE A LOUD BACK FIRE LOL SCARED THE *** OUT OF ME LOL
ANY IDEAS?????

[Bullitt95]

The backfiring is probably being caused by raw fuel entering the headers, an indication that the engine's running way too rich at WOT. Unless you have forced induction, you don't need anything bigger than 24lb injectors. Your 42lb'ers are much too big and they're probably drowning your plugs in fuel during warm-up, causing the hesitation.

[Timm10221]

O2 sensors!?!

[dsaleen2002]

ok sounds good but i have a vortech supercharger and my car was dynod at 500 hp rw at larrocas in nj.....
the s/c is at 11 to 15 psi on a cool day
i shoul have explained that from the begining;;
plus i have a 255 psi intank pump and a votech outside pump---the fuel psi reads (((80 psi when on 10 psi of boost))) and 35 psi at idle
(((( plus any nj guys out there, know of a good mustang shop --larrocas closed down and i would like something near by close to rt33 lol...
the back fire started happening when the s/c was added on to the car...

[Bullitt95]

Originally Posted by dsaleen2002 ok sounds good but i have a vortech supercharger and my car was dynod at 500 hp rw at larrocas in nj..... the s/c is at 11 to 15 psi on a cool day i should have explained that from the begining;;

Yeah, that would have been helpful.
Since the problem only started after the supercharger was installed, you might wanna check that there's no leak where the supercharger's mounted to the intake manifold, and check the throttle body gasket area.

[dsaleen2002]

okok
my bad on that one--lol
well every thing is tighter then the car lol---
no leak bone dry system looks good......