Z06Frank

Hi, me and my tuner are having problems setting my 02 Vette with HPTuners problems and mods listed below. Willing to send my base or modified map to someone who tunes allot of these cars. All the problems are realy all under 2000RPM it runs the very best at WOT.

Problems:

Bucks between 1500rpm to 2000rpm.
Idle will drop to 500rpm at stop light then shoot up to around 1500rpm then idle will stabilize.

Part List:

Texas Speed MS4 Cam 239/242, .649"/.609" 111LSA
FAST 90mm Intake Manifold
LS2 90mm Throttle Body
FAST #36 Injectors
LG Motorsport pro longtube headers
B&B Bullet Exhaust
Powerbond 25% underdrive pulley
Halltech Stinger CAI

SSpdDmon

iTrader: (10)

Bucking - Sounds like it has too much timing and may be too lean down low. Suggest lowering the timing and increasing the O2 switch points to richen it up (assuming it's still running in closed loop).

You can control idle drop with throttle cracker/follower and timing. I give some hints how in my sticky over at EFI Live. The same tables are available in HPT.

http://forum.efilive.com/showthread.php?t=4661

Z06Frank

I have my stock map and the map that my tuner worked on if I upload them here can someone look at them ?

Gordon0652

iTrader: (4)

Last year i tried tuning my MS4 with EFIlive... Took me all winter on my dyno and still i could not do it.
Maybe you will have better luck!

nikon1999

iTrader: (22)

definitely timing issue with the bucking most likely. The coming back to idle sounds like the raf needs to be dialed in. What are iac counts?

Where i would start