RPO_Z06

iTrader: (11)

I installed a FAST 90 with a LS2 TB and all was going well, the car was running surprisingly well with nothing more than a minimal amount of idle hunting right off the bat.

Then it happened I reset my LTFTs and nothing else, I drove the car to the track, didn't race because I have a clutch issue (another story) but while driving there I noticed it was surging really bad at cruise speeds, I decided to record a log and this is what I see.

I checked for air leaks, exhaust leaks and was about to swap sensors but thought I would try here first.

Anyone got any idea's ?

TIA

ZoFastSS

iTrader: (5)

I still have a whole lot to learn.

txhorns281

iTrader: (12)

bank 2 has an issue (passenger side) on throttle let off, why the crazy TPS??? Did you intentionally drop out of it, or is it hiccuping as you progress?

SideStep

cantdrv65

iTrader: (3)

Yep look at your LTFT on bank 2... 20.0 and the other is 3.1. Id say you have an intake leak on the bank two side of the intake. You can spray carb cleaner in the area of each port and see if the idle changes OR take a Cigarette or incense stick burning in the area and see if the smoke is drawn in to one of the ports.

RPO_Z06

iTrader: (11)

I know I must have a leak but I can't find it so far, are the newer FAST intakes bad about leaks ?

RPO_Z06

iTrader: (11)

Found it.. turns out it was an injector o-ring, it wouldn't leak at idle it took some RPM's to make it leak.

Thanks for all the responses.

cantdrv65

iTrader: (3)