93 K1500 5.7L 4X4
I HAVE INSTALLED HEDMAN HEADERS WITH COLLECTOR BACK DUAL EXHAUST. MY MPG WENT FROM BAD (12-15) TO TERRIBLE (7-8) WITH THE TAILGATE OFF. I BELIEVE I SHOULD HAVE HAD AN INCREASE NOT A DRAMATIC DECREASE. IT RUNS BETTER BUT EXHAUST SMELLS VERY RICH.
I WELDED IN A NEW O2 SENSOR AND RUN ONLY THRUSH MUFFLERS. I CHECKED THE TIMING AND SET IT TO 1 DEGREE ADVANCE.
CAN THE FUEL MIXTURE BE ADJUSTED THROUGH THE COMPUTER?
-DEALERSHIP WONT EVEN HOOK UP TO MY TRUCK BECAUSE NO CAT
WHERE COULD I FIND SOMETHING CAPABLE OF ADJUSTING MIXTURE SHORT OF REPLACING ENTIRE INTAKE SYSTEM?
IS THERE ANYTHING I'M NOT THINKING OF?
ANY SUGGESTIONS ARE GREATLY APPRECIATED.
THANKS
-12 ga
