Shift problems
Thread Starter
On The Tree
Joined: May 2003
Posts: 179
Likes: 2
From: So. IL
Shift problems Fresh FLT Lvl 4 and SS4000. Cam only LS1 Shift points @ 6400 on a SD tune. (Not tuned by me)
Have thrown a couple codes since trans install. P0102 & P0103. Both are set to No Mil Light.
First passes on new freshened trans, converter and rearend were last week and it ran flawless and had a PB 7.18@94mph, 1.52 60ft
Had a TPS issue during the week and replaced and calibrated new one.
Go to track tonight and it gets out in 1st gear passed the 60 ft, then shifts straight to 3rd. Running in D. One time it went from 1st to 4th and it was in D.
I also threw a TPS High Voltage DTC, but looking at log, I have 100% throttle all the way.
I tried making a hit on the street from a 20 roll and it shifted as intended. I stop, do a burnout and go from a 10 roll and get a little spin and it ran ok.
Checked trans fluid and it was at the Cold mark when hot. Added a quart and went back to it and still the same.
I've had HPtuners about 2 weeks, so I have no idea what I'm doing other than the absolute basics.
Have thrown a couple codes since trans install. P0102 & P0103. Both are set to No Mil Light.
First passes on new freshened trans, converter and rearend were last week and it ran flawless and had a PB 7.18@94mph, 1.52 60ft
Had a TPS issue during the week and replaced and calibrated new one.
Go to track tonight and it gets out in 1st gear passed the 60 ft, then shifts straight to 3rd. Running in D. One time it went from 1st to 4th and it was in D.
I also threw a TPS High Voltage DTC, but looking at log, I have 100% throttle all the way.
I tried making a hit on the street from a 20 roll and it shifted as intended. I stop, do a burnout and go from a 10 roll and get a little spin and it ran ok.
Checked trans fluid and it was at the Cold mark when hot. Added a quart and went back to it and still the same.
I've had HPtuners about 2 weeks, so I have no idea what I'm doing other than the absolute basics.
Last edited by Rick01SS; Oct 7, 2017 at 02:08 AM.
TECH Fanatic
Joined: Jan 2015
Posts: 1,114
Likes: 33
From: Fort Worth, Texas
According to the log....It definitely skipped some gears.
Log #2.
1:21.405, 1st gear, D4, 100% TPS
1:21.494, 3rd gear, D4, 100% TPS
Skips 3rd gear.
Your car takes off in 2nd with the shifter in D2!....
0:54.292, 2nd gear, D2, 30.3% TPS......ZERO MPH.
Log #1, Commanded to shift from 1st to 4th in under a second.......
1:19.897, 1st gear, D4, 100% TPS, 45 MPH.
1:19.975, 2nd gear, D4, 100% TPS, 46 MPH, 6,217 RPM
1:20.440, 3rd gear, D4, 100% TPS, 54 MPH, 5,454 RPM
1:20.595, 4th gear, D4, 100% TPS, 55 MPH, 5,256 RPM
I doubt it actually got into 4th gear in this time frame, Without a valid Input Shaft RPM.....I can't tell.
Log #3.
5:23.611, 2nd gear, 100% TPS, D4, 67 MPH, 5,568 RPM
5:23.876, 4th gear, 100% TPS, D4, 69 MPH, 5,611 RPM
Skips 3rd
Post your tune, Your shift speed tables may be hacked up, Just keep in mind when tuning WOT shifts that just because a ratio change is commanded doesn't mean it will actually change right then.....Hydraulics take time!
Log #2.
1:21.405, 1st gear, D4, 100% TPS
1:21.494, 3rd gear, D4, 100% TPS
Skips 3rd gear.
Your car takes off in 2nd with the shifter in D2!....
0:54.292, 2nd gear, D2, 30.3% TPS......ZERO MPH.
Log #1, Commanded to shift from 1st to 4th in under a second.......
1:19.897, 1st gear, D4, 100% TPS, 45 MPH.
1:19.975, 2nd gear, D4, 100% TPS, 46 MPH, 6,217 RPM
1:20.440, 3rd gear, D4, 100% TPS, 54 MPH, 5,454 RPM
1:20.595, 4th gear, D4, 100% TPS, 55 MPH, 5,256 RPM
I doubt it actually got into 4th gear in this time frame, Without a valid Input Shaft RPM.....I can't tell.
Log #3.
5:23.611, 2nd gear, 100% TPS, D4, 67 MPH, 5,568 RPM
5:23.876, 4th gear, 100% TPS, D4, 69 MPH, 5,611 RPM
Skips 3rd
Post your tune, Your shift speed tables may be hacked up, Just keep in mind when tuning WOT shifts that just because a ratio change is commanded doesn't mean it will actually change right then.....Hydraulics take time!
Thread Starter
On The Tree
Joined: May 2003
Posts: 179
Likes: 2
From: So. IL
Thanks for the help. I changed the TPS again with an AC Delco part and that solved the problem.
Forgot to add I was getting the P0121 code too.
https://ls1tech.com/forums/automatic...sh-more-2.html
Forgot to add I was getting the P0121 code too.
https://ls1tech.com/forums/automatic...sh-more-2.html
TECH Fanatic
Joined: Jan 2015
Posts: 1,114
Likes: 33
From: Fort Worth, Texas
Didn't see any TPS percentage issues in the log, Not really surprising though as I have had problems trying to diagnose issues with HPTuners.......That are easy to spot by logging with my Tech 2.