TBSS going back to stock help
Thread Starter
On The Tree
Joined: Feb 2020
Posts: 180
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TBSS going back to stock help I recently purchased an 07 Trailblazer SS AWD for my wife to drive daily. It has long tube headers, and no cats. Driving it, it wants to hang on to first gear, it upshifts and downshifts just fine outside of that. It will shift normally out of first if you are very light on the throttle. Being it has no cats, I assume someone has gotten into the pcm, which makes me think they have messed with shift points. I have only made changed to PCMs using PCM Hammer and Tuner Pro. I recently purchased HP tuners to make it easier to diagnose and modify my swapped vehicles. I have zero experience using HP tuners outside of playing around with it looking at live data on my vehicles.
Can any of you folks make any suggestions on where I would want to look at first to see what changes were done to the transmission?
Thanks for any help!
Can any of you folks make any suggestions on where I would want to look at first to see what changes were done to the transmission?
Thanks for any help!
Thread Starter
On The Tree
Joined: Feb 2020
Posts: 180
Likes: 14
Thread Starter
On The Tree
Joined: Feb 2020
Posts: 180
Likes: 14
Sorry for another dumb question, but do they have tunes with simple modifications like just headers? I want to assume being Alpha-N that it would compensate for basic changes in air flow, but I really don’t know.
thanks again!
thanks again!
They use to. Several years back when the EPA started cracking down, they took down all the modified tunes and just left the stock ones. These PCM's aren't Alpha N. They are MAF and MAP based. Fords use Alpha N when the MAF fails. Oother than aftermarket ECMs, I'm not sure anyone others than use it.
Last edited by LilJayV10; Jan 31, 2024 at 10:14 PM.
They use to. Several years back when the EPA started cracking down, they took down all the modified tunes and just left the stock ones. These PCM's aren't Alpha N. They are MAF and MAP based. Fords use Alpha N when the MAF fails. Oother than aftermarket ECMs, I'm not sure anyone others than use it.
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On The Tree
Joined: Feb 2020
Posts: 180
Likes: 14
I assumed having a MAF made it Alpha N. I only assume that because I started my fuel injection life using megasquirt and I always thought that having a MAF made it Alpha N. I’ve only done SD setups.
Got to the repository and found some stock tunes. I’m currently googling and watching videos on the subject, but I have another dumb question. Am I able to pull my vehicles stock tune without buying credits? Just to have to compare to the stock ones I have gotten.
Thanks for the help!
Got to the repository and found some stock tunes. I’m currently googling and watching videos on the subject, but I have another dumb question. Am I able to pull my vehicles stock tune without buying credits? Just to have to compare to the stock ones I have gotten.
Thanks for the help!
Thread Starter
On The Tree
Joined: Feb 2020
Posts: 180
Likes: 14
Well I have answered my own question, I’ll have to get the credits to pull my tune to compare.
I downloaded 2 “stock” TBSS tunes to compare, and I have noticed a difference in the torque management. The only concern or question I have is if there would be a difference between RWD and AWD trans settings. It didn’t state that. I’ll just download them all and compare I guess.
I downloaded 2 “stock” TBSS tunes to compare, and I have noticed a difference in the torque management. The only concern or question I have is if there would be a difference between RWD and AWD trans settings. It didn’t state that. I’ll just download them all and compare I guess.
Unless something has changed, you should be able to read the tune out of your vehicle and save it.
It only makes you buy credits when you try and write it.
I would also make sure you are comparing the some operating systems(OS). and obviously engine
I don't know for certain, but I would venture to guess the tunes would be different between a RWD and AWD tune.
It only makes you buy credits when you try and write it.
I would also make sure you are comparing the some operating systems(OS). and obviously engine
I don't know for certain, but I would venture to guess the tunes would be different between a RWD and AWD tune.
Last edited by LilJayV10; Feb 1, 2024 at 07:55 PM.
Thread Starter
On The Tree
Joined: Feb 2020
Posts: 180
Likes: 14
I’m finding a lot of changes between a stock awd tune from the repository and my tune in the transmission. I have never made changes to anything automatic trans related on a pcm. Would I be better off posting my tune and a stock tune on hp tuners for someone to maybe help guide me to make some changes?
Thread Starter
On The Tree
Joined: Feb 2020
Posts: 180
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I am attaching the tune. Something I noticed after posting last, the scales on the tables arent exactly the same between mine and the 06 tune.
Side note, I pulled the tune this morning, the wife just took it out and said the check engine light is on and its shifting normal. Ill report back once I can plug into it.
Thank you for the help!
Side note, I pulled the tune this morning, the wife just took it out and said the check engine light is on and its shifting normal. Ill report back once I can plug into it.
Thank you for the help!
Thread Starter
On The Tree
Joined: Feb 2020
Posts: 180
Likes: 14
Ok. I must have done something wrong. I just plugged it in and read the tune, I didn’t select anything different. The first time I tried it timed out, so I shut everything down and tried it again. I did notice I couldn’t see any of the engine stuff on the tune. I did get a CEL, P0606 after trying to pull the tune.
I will plug back in and try again.
I will plug back in and try again.
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