In the past month, the following was installled on my Mach 1
4.30 gear
aluminum drive shaft from a 2000 Mustang GT
Tune (A/F was 12.8 and 28 degrees timing)
Problem:
This has happened twice in the past couple of weeks (at night, cooler air). When shifting into 4th, under full load (WOT), the car (engine) begins to violently buck as if something sparatically pushing against the front of the car. If I take my foot off the gas, then the bucking stops. This does not happen when shifting into any other gears or when I am already in 4th and then floor it (WOT). And of course, this bucking does not occur every time I enter 4th at WOT.
I was thinking a broken motor/trans mount or wrong driveshaft; however, the inconsistency makes me think it is the tune, bad ignition coil, who knows?
Going to attempt to get the car back to the tuner prior to MSC next Saturday.
Dave
4.30 gear
aluminum drive shaft from a 2000 Mustang GT
Tune (A/F was 12.8 and 28 degrees timing)
Problem:
This has happened twice in the past couple of weeks (at night, cooler air). When shifting into 4th, under full load (WOT), the car (engine) begins to violently buck as if something sparatically pushing against the front of the car. If I take my foot off the gas, then the bucking stops. This does not happen when shifting into any other gears or when I am already in 4th and then floor it (WOT). And of course, this bucking does not occur every time I enter 4th at WOT.
I was thinking a broken motor/trans mount or wrong driveshaft; however, the inconsistency makes me think it is the tune, bad ignition coil, who knows?
Going to attempt to get the car back to the tuner prior to MSC next Saturday.
Dave