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View Full Version : Long Tubes make GTO stumble at low speeds?


1SlowHoe
June 7th, 2008, 02:52 PM
I put long tubes on my 6L GTO. Now it seems to stumble and surge slightly after I push in the clutch approaching a stop sign. Even worse if the air conditioner is on.
Throttle follower/cracker adjustment? I was thinking of adjusting the VE cells (B0200) to match from 1200rpm and below using the stock 1200rpm settings. Just wondering what you would do? I know it is probably an easy fix.:doh2:
Chris
Aint Skeered
June 10th, 2008, 10:48 PM
are your fuel trims positive ?
1SlowHoe
June 12th, 2008, 11:04 AM
I haven't logged anything yet. I will let you know when I get a chance to play with it.
white01ss
June 18th, 2008, 05:56 AM
Play with the Desired Airflow table under the idle section. I had to up mine to cure my swinging idle while moving problem. You might need to lower yours a bit.
1SlowHoe
June 18th, 2008, 02:28 PM
I was looking for that table but not sure which one it is.I don't have a throttle craker or follower in this OS either.....
I attached the tune if anyone wants to peak at it. At least tell me which table I should be adjusting..:help2:
white01ss
June 19th, 2008, 03:42 AM
It "might" be B1829 Minimum Idle Airflow. I only have experience with the LS1 PCM so maybe someone else can verify.

Also, 1710, 1711, 1712, 1713, 1714 probably should be modified after long-tubes. My car ran rich as hell after putting long tubes on. Lowering the O2 switch point table (as it's called in my PCM) 5-7% brought my AFR from 13.1 back up to 14.7. Obviously, you'll need a wideband to do this. Also, make small changes to those values because they are very sensitive.