1999 GT

my gt has 53k on it, its my dd and i never had a problem with it. i got a sct tuner for it a couple days ago and ever since i uploaded the AM custom tune, it makes a deep rattle/clunk sound at low rpm's when i slip the clutch. my buddys gt does the same thing ever since he got the tuner for his about a year ago. it never did this before though. does anyone know what it is? or why its caused? thanks

hot sauce

does the sound increase with the rpm?

1999 GT

no, its just a quick sound when the clutch is engaged. its not continuous

smashten

did you try to load your original tune to see if it goes away?

mustang51js

what gas you using, sounds like pinging from lower octane in the higher octane tune

1999 GT

its a 91 tune and i put 93 in it always. so i dont know if the gas is crappy, or what. but the more i hear it, its definately pinging. it only does it under load at low rpm's and if youre in 4th or 5th at about 1000 rpm's it'll do it continually instead of for just a quick second when you slip the clutch. i checked the timing adjustments on the custom tune at its at 0 degrees for all parameters.

2000BlkGtConvgobucks

A video or sound clip would really help this thread out

hot sauce

+1 on the sound clip