Goldfinger911
August 30th, 2007, 11:23 AM
I recently bought a low miles 2002 WS6 M6. It has a Cartek 382 Stroker LS1 and a bunch of goodies (below). It has a couple of problems that I have been trying to solve with no luck. I have been reading this forum and several books for a week straight. No luck. I dont know whether or not to keep trying to fix the tune that came on it, or start over with a base tune from one of the EFILive gurus here. Hopefully someone can give me a good base tune? :)
The problem is, the car starts right up... and fast idles fine, at an AFR of 14:1. Then over the next 1-2 minutes it gets leaner and leaner. Until it reached 18:1 and starts lean missing. It even gets to 19.2:1 while missing. It does this hot or cold also.
The second problem is when driving, when I let off the gas, the throttle seems to stick between 1800-2200 rpm. Rolling or stopped. Then if it blip it, it comes down. It is not physically sticking, I have checked that. It seems to be IAC related. Maybe a th. follower or th. cracker problem?
The car specs and tune are below.
Should I keep tweaking or start over? one thing I noticed right away, is they did not have the engine displacement correct, which I fixed, and they had a MAF calibration for a stock MAF. I have a Delphi 85mm MAF descreened. I found out that it is off a 2002 Z06. I updated the MAF cal table for this model and year.
2002 Trans Am WS6 M6
Cartek 382 Stroker LS1 (all forged inside 3.905" x 4:000")
Cartek Stage 3 heads
Cartek cam 230/234 .600 lift 113-LSA
SVO 30lb injectors
Boost-a-pump with 60psi pressure at idle
Fast 90mm Intake
TPIS 90mm TB
85mm Delphi TB
11:1 Compression
GMMG Exhaust
No Cats
Moser 9" with 4:10, 35 splines, and Detroit Locker
PLEASE PLEASE PLEASE someone take a look and make suggestions, or if you have a great base tune for a stroker, let me know? :) I have been reading and reading for a week straight with no luck. I have tuned AEM standalones and Toyota ECU's, so I am not a total newb.
The problem is, the car starts right up... and fast idles fine, at an AFR of 14:1. Then over the next 1-2 minutes it gets leaner and leaner. Until it reached 18:1 and starts lean missing. It even gets to 19.2:1 while missing. It does this hot or cold also.
The second problem is when driving, when I let off the gas, the throttle seems to stick between 1800-2200 rpm. Rolling or stopped. Then if it blip it, it comes down. It is not physically sticking, I have checked that. It seems to be IAC related. Maybe a th. follower or th. cracker problem?
The car specs and tune are below.
Should I keep tweaking or start over? one thing I noticed right away, is they did not have the engine displacement correct, which I fixed, and they had a MAF calibration for a stock MAF. I have a Delphi 85mm MAF descreened. I found out that it is off a 2002 Z06. I updated the MAF cal table for this model and year.
2002 Trans Am WS6 M6
Cartek 382 Stroker LS1 (all forged inside 3.905" x 4:000")
Cartek Stage 3 heads
Cartek cam 230/234 .600 lift 113-LSA
SVO 30lb injectors
Boost-a-pump with 60psi pressure at idle
Fast 90mm Intake
TPIS 90mm TB
85mm Delphi TB
11:1 Compression
GMMG Exhaust
No Cats
Moser 9" with 4:10, 35 splines, and Detroit Locker
PLEASE PLEASE PLEASE someone take a look and make suggestions, or if you have a great base tune for a stroker, let me know? :) I have been reading and reading for a week straight with no luck. I have tuned AEM standalones and Toyota ECU's, so I am not a total newb.