My 2008 GT500 has a missfire

mustangray · 05-30-2009

A new question for everyone, my '08 GT500 is now missing at low RPM between 1500-3000 it doesn't do it all the time but it is annoying,the dealer can't figure it out they suggested putting the stock airbox on which we did,changed the program three times including the stock tune and still the miss continues so now I'm open to suggestion .

I recently had an engine noise and I took it to the dealer and they found nothing but the noise was gone .

**pcfrisch** · 05-30-2009

Has the dealer checked the coil paks?

mustangray · 05-30-2009

coil packs all good injector also tested and all good

Snake Pliskin · 05-30-2009

Definitely be on the dealer with it being under warranty. Fuel quality? clogged injector? Wiring grounding out? Vacuum leak or do the newest cars not use vacuum lines? Just some guesses.

mustangray · 05-30-2009

The dealer just keeps saying bring it back as long as is keeps doing it I talked with the techs and they are starting to think they might have to replace the harness which they really don't want to do

GT500Girl · 05-31-2009

Hmmm...did they check the spark plugs as well? Sounds like a vacuum leak, fuel or something along those lines.

mustangray · 05-31-2009

Hi GT500 girl nice to hear from you,Yes they checked the plugs fuel and vac. and found nothing .
did I mention no check eng lights either. this car has been running in this configuration for over a year then suddenly started acting weird these last couple of months

mustangray · 08-15-2009

Well here is an update for everyone the dealer found that first off the Bassani cats cooked and were falling apart in the tube second the lifters (hyd. valve lash adjusters) were sticking causing the valves to hang up thus my misfire the car is running great now but is way to loud since my cats are empty .
Thanks everybody for the input it all helps