Issues Cruising stalled ls1/4l80e
Thread Starter
Teching In
Joined: May 2007
Posts: 36
Likes: 0
From: Monroe Township, NJ
Issues Cruising stalled ls1/4l80e I'm having issues when cruising around when going over 35-40 mph the transmission acts like it's in neutral. The only way to get the trans to "engage" again is to mash the pedal. It's really annoying I haven't wanted to drive it too far because of the issue. Any suggestions?
Setup-
-94 S10, 8.8 rear. Caltracs, DRs.
-LS1 Intake, ls6 intake mani, LT headers, no cats mated to a 4l80e
-Circle D 4,200 stall
-PCM of NC 4l60 to 4l80 Conversion Harness http://www.pcmofnc.com/product/pcm-o...rsion-harness/
-Base transmission tune from PCM of NC and I maxed out misfire tables myself(researched the issue and this was the fix)
-added a 4l60e harness
Located in Central NJ, so if anyone local can help that would be cool!
Setup-
-94 S10, 8.8 rear. Caltracs, DRs.
-LS1 Intake, ls6 intake mani, LT headers, no cats mated to a 4l80e
-Circle D 4,200 stall
-PCM of NC 4l60 to 4l80 Conversion Harness http://www.pcmofnc.com/product/pcm-o...rsion-harness/
-Base transmission tune from PCM of NC and I maxed out misfire tables myself(researched the issue and this was the fix)
-added a 4l60e harness
Located in Central NJ, so if anyone local can help that would be cool!
10 Second Club
Joined: Nov 2005
Posts: 933
Likes: 75
You might look at your auto tcc normal table and lower the mph that it locks up. Your converter lockup is engaging at 43mph. Make sure and change the 4th unlock table about 2-3 mph lower than the lockup you select. I have mine setup to lock up at 45mph but I have a 2800 stall so it is not as noticeable as 4200 stall.
It also unlocks at 56% throttle again. You could extend this row on to keep it locked in 4th on the street. Don't know if this will work, but give it a try. Be sure and save your original tune first.
It also unlocks at 56% throttle again. You could extend this row on to keep it locked in 4th on the street. Don't know if this will work, but give it a try. Be sure and save your original tune first.
Thread Starter
Teching In
Joined: May 2007
Posts: 36
Likes: 0
From: Monroe Township, NJ
Thank you for the suggestion. I went ahead and copied someone else's tune values and was hoping for the best and it's still doing the same thing at 45mph.
I noticed when playing back my log that theTPS had no reading what so ever. Will have to take a look at that tomorrow.
I noticed when playing back my log that theTPS had no reading what so ever. Will have to take a look at that tomorrow.
Moderator
Joined: Aug 2010
Posts: 7,323
Likes: 529
From: Ann Arbor, MI
Since you have HP Tuners, put the rear up on jack stands and use the scanner to command each gear.
If that doesn't work you have a trans or wiring problem.
If it does work, then the tune needs to be examined more carefully.
Is this a brand new build? Did it ever work correctly?
When you say "acts like it is in neutral" does that mean if you give a little gas the engine revs and the car does not accelerate at all? If true that has nothing to do with TCC tuning. It appears the trans does not engage 4th gear.
If this turns out to be a trans problem, I will move this thread to the Automatic Transmission section.
If that doesn't work you have a trans or wiring problem.
If it does work, then the tune needs to be examined more carefully.
Is this a brand new build? Did it ever work correctly?
When you say "acts like it is in neutral" does that mean if you give a little gas the engine revs and the car does not accelerate at all? If true that has nothing to do with TCC tuning. It appears the trans does not engage 4th gear.
If this turns out to be a trans problem, I will move this thread to the Automatic Transmission section.
Thread Starter
Teching In
Joined: May 2007
Posts: 36
Likes: 0
From: Monroe Township, NJ
Since you have HP Tuners, put the rear up on jack stands and use the scanner to command each gear.
If that doesn't work you have a trans or wiring problem.
If it does work, then the tune needs to be examined more carefully.
Is this a brand new build? Did it ever work correctly?
When you say "acts like it is in neutral" does that mean if you give a little gas the engine revs and the car does not accelerate at all? If true that has nothing to do with TCC tuning. It appears the trans does not engage 4th gear.
If this turns out to be a trans problem, I will move this thread to the Automatic Transmission section.
If that doesn't work you have a trans or wiring problem.
If it does work, then the tune needs to be examined more carefully.
Is this a brand new build? Did it ever work correctly?
When you say "acts like it is in neutral" does that mean if you give a little gas the engine revs and the car does not accelerate at all? If true that has nothing to do with TCC tuning. It appears the trans does not engage 4th gear.
If this turns out to be a trans problem, I will move this thread to the Automatic Transmission section.
I got the transmission off Craigslist for cheap but it seems okay. I went from a t56 to this trans so this is the first time im using it.
The issue is the engine revs up but the truck doesnt accelerate. I can get it to accelerate again by mashing the fun pedal... Then at that point im way past the speed limit.
This truck wasn't built to be a daily but I want it to still drove normal through town. Hopefully that's still possible with the stall.
Moderator
Joined: Aug 2010
Posts: 7,323
Likes: 529
From: Ann Arbor, MI
Should have noticed before - a 4200 stall is very high for street driving, feels even worse with a heavy vehicle and not well matched to a stock-ish cam.
You probably want something more in the 2800 stall range.
You probably want something more in the 2800 stall range.
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
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
Launching!
Joined: Mar 2007
Posts: 227
Likes: 29
From: DC Metro area
You're welcome. Search for it on the HP Tuners forum. Here's a tip for that tool. If you highlight each field, it will tell you what that field does. It's pretty neat. I used it to get my trans shift points and stuff right in my G8.
