Greetings-
I have an odd problem with my 06 GT that I am hoping some of you have experience with, more specifically, experience AND a cure! :lol
My car was taken to a very experienced high-performance Ford tech for a dyno tune. 16 year Ford master tech who opened his own shop to do mods such as this, and a really sharp guy. He is an SCT dealer. My car, bone stock except for K&N filters and a FRPP muffler, with 700 miles on it, misfired like crazy on the first pull. The dyno graph showed an extremely ragged HP curve, and at about 5500 it fell on its face, with really bad misfiring. 454 HP at the wheels, quite dismal IMHO. Having seen problems like this before with high boost and platinum plugs, the tech swapped in copper plugs gapped down. The misfire was far less noticable, and the car picked up about 50 hp and held its lunch until about 6k. We continued with the install of a 2.7 pulley and an SCT tune. The car made around 590 hp and still had a misfire. A/F is nice and steady, on the safe side at 12:1 +/- as I recall. There is a lean spike on tip in down low, but that is common I presume. I still have a misfire you can feel on the dyno, the car literally bucks.
We swapped in a set of known-good ignition coils, no change. We swapped in a new crank position sensor, no change. I had the local Ford hacks do a series of tests but all they suceeded in doing was scratching my door, hood, and door sill. :thumbsdow
I now have about 1700 miles on the car, and it runs well, but I know it could run a heck of a lot better without the spark issue. Last dyno pull was 608 HP and 570 ft lbs tq. (+/-, don't have the sheet here).
Obviously, I would like to solve this soon as I am planning a 2000 mile road trip to VIR for the Shelby club convention in 2 weeks. Well, I'd like to solve this and about 5 other problems like the "rattlesnake" noise in the dash and the like...but the misfire is the most troubling and pressing issue.
Any help or advice you can offer would be much appreciated.
Best regards,
Colin
I have an odd problem with my 06 GT that I am hoping some of you have experience with, more specifically, experience AND a cure! :lol
My car was taken to a very experienced high-performance Ford tech for a dyno tune. 16 year Ford master tech who opened his own shop to do mods such as this, and a really sharp guy. He is an SCT dealer. My car, bone stock except for K&N filters and a FRPP muffler, with 700 miles on it, misfired like crazy on the first pull. The dyno graph showed an extremely ragged HP curve, and at about 5500 it fell on its face, with really bad misfiring. 454 HP at the wheels, quite dismal IMHO. Having seen problems like this before with high boost and platinum plugs, the tech swapped in copper plugs gapped down. The misfire was far less noticable, and the car picked up about 50 hp and held its lunch until about 6k. We continued with the install of a 2.7 pulley and an SCT tune. The car made around 590 hp and still had a misfire. A/F is nice and steady, on the safe side at 12:1 +/- as I recall. There is a lean spike on tip in down low, but that is common I presume. I still have a misfire you can feel on the dyno, the car literally bucks.
We swapped in a set of known-good ignition coils, no change. We swapped in a new crank position sensor, no change. I had the local Ford hacks do a series of tests but all they suceeded in doing was scratching my door, hood, and door sill. :thumbsdow
I now have about 1700 miles on the car, and it runs well, but I know it could run a heck of a lot better without the spark issue. Last dyno pull was 608 HP and 570 ft lbs tq. (+/-, don't have the sheet here).
Obviously, I would like to solve this soon as I am planning a 2000 mile road trip to VIR for the Shelby club convention in 2 weeks. Well, I'd like to solve this and about 5 other problems like the "rattlesnake" noise in the dash and the like...but the misfire is the most troubling and pressing issue.
Any help or advice you can offer would be much appreciated.
Best regards,
Colin