Shift issues after intake swap
Shift issues after intake swap Hey guys,
Long time user, first time poster.
I just recently swapped out my stock ls1 intake for a ls6+85mm TB. All went well and the car drive fine for the first day. I am now noticing that the trans shifts early at anything but WOT. At WOT it shifts normally but I have a huge power loss right after the shift. I have also noticed that at part throttle it will shift very early and the shifts are tighter than normal (i.e. chirps tires when shifting at 3-4k). I have checked all plugs and vacuum lines and all seems normal. I have yet to check TCC/TPS readings. Thanks for any help in advance.
Vehicle is a 98 Camaro SS with the following upgrades:
CAI
LS6 intake/85MM TB
LT's
Full exhaust w/o cats
AIR/EGR delete
Long time user, first time poster.
I just recently swapped out my stock ls1 intake for a ls6+85mm TB. All went well and the car drive fine for the first day. I am now noticing that the trans shifts early at anything but WOT. At WOT it shifts normally but I have a huge power loss right after the shift. I have also noticed that at part throttle it will shift very early and the shifts are tighter than normal (i.e. chirps tires when shifting at 3-4k). I have checked all plugs and vacuum lines and all seems normal. I have yet to check TCC/TPS readings. Thanks for any help in advance.
Vehicle is a 98 Camaro SS with the following upgrades:
CAI
LS6 intake/85MM TB
LT's
Full exhaust w/o cats
AIR/EGR delete
Last edited by nine8ss; Feb 25, 2016 at 05:30 PM.
I will be putting a cam in next week so I planned on doing the tune then.
Not sure if this helps but from a stop until first shift the car performs beautifully. There was a noticeable gain in hp after the swap. Its when 2nd gear hits that power is lost and it kinds bogs down.
Not sure if this helps but from a stop until first shift the car performs beautifully. There was a noticeable gain in hp after the swap. Its when 2nd gear hits that power is lost and it kinds bogs down.
Finally got around to replacing the TPS. The shifting is fixed now - horray! Unfortunately, now I have an idle of around 1200 in park. I unplugged the sensor and turned the key on for 30s, turned off the key and plugged the TPS back in. Same idle in park. Any ideas?
Well, I spoke too soon. Took it out on the highway and I am having the same problems. It loses power at about 5500 WOT, shifts into second, then third and fourth in a matter of seconds, all while at WOT.
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Back again with the same problems as before. Had it tuned by Frost and it seems to be running excellent, minus the bogging down immediately after shifting into 2nd. This problem initially happened after changing to an LS6 intake and aftermarket TB. I have tried a new TPS, but the problem was soon to return after doing so. Any suggestions? I would really like to take it to the strip this weekend and see what type of numbers I can pull.
The car was bone stock besides the CAI before the I/TB swap. The problem was definitely not there before. The intake has been off twice since then and the MAP seal was replaced as well.
Joined: Nov 2003
Posts: 6,216
Likes: 236
From: Wichita KS / Rancho San Diego
It sounds similar to MAF-related misbehavior. Unless it got dirty somehow, it's hard to imagine how it would be related to your swap. You could try test driving it with the MAF unplugged and see if it still does the same thing.
Unplugged the MAF and the problem remains. If anything, that seemed to make it worse. If I can get my hands on a friends scanner, is there anything specific I should be watching?
