spgino

iTrader: (1)

hey all.. i am new here.. great site btw..
newayz.. just got a new fuel filter installed last week and just noticed quite a bit of hesitation initially when i punch the throttle at 2000-3000 rpms.

i had the car tuned about a month ago (it was found to be running lean)..

i have also noticed a lot of movement in the 6-sp shifter (possible tranny mount on the way out). could these be related??

what could be the cause/fix of this hesiation??
mods K&N intake, ported TB, LS6 intake, catback exhaust (magnaflows)
dyno'd 328hp 337tq (after tune)

luv2spd

iTrader: (1)

Hesitation is usually associated with being lean. Since this happens when you punch the throttle, it makes me think it could be a prob. with your ve table since that is what's referenced for fueling during throttle transients. This lean spot can also quite possibly give you a blip of kr too.

spgino

iTrader: (1)

i dont understand why this would happen after a new fuel filter.. it was dyno tuned w/ A/F meter to around 13:1 before the filter was installed... but this problem just recently occured with the new filter installed??? and it only happens when i blip the throttle, if i gradually step into it i dont notice a problem??? would it still be the VE tables??

luv2spd

iTrader: (1)

Well, idk about what the filter would have to do with it, but hesitation when blipping the throttle could be a lean spot in the ve table. The ve table is referenced during sudden changes in map, like blipping the throttle. It could also be something with fuel pressure i suppose. So it didn't have any hesitation before the filter change? Maybe try a different filter??? Sorry I can't be of much help. Hope you get it all figured out.

jimmyblue

iTrader: (11)

If it was tuned to the "fuel flow reality" of the crusty
old filter, then maybe your fueling is now up, and the
tune is richer than before.