Transmission issues after DOD delete

[superdave160]

One last thing.  Go back over the plug wire ends and twist them left and right a bunch to remove the trapped air. Done

Trapped air will push them off the connection

 

Interesting!  Thanks!

[Snowcamo]

 

 

Your most welcome.

Edited March 4, 2023 by Snowcamo

[superdave160]

I hooked up to the camper this morning and pulled it about 50 miles to verify that the transmission issue described above was no longer present.  It was not.  Looks like the truck is good to go now.  I'm going to take it to the local tuner tomorrow to fine tune the ECM.

[Snowcamo]

Rock on  

[superdave160]

My truck started idling very rough again.  It appeared to be surging, the RPM would be between 650 and 700, and then drop to around 550.  This was random, but occurred several times per minute.  I checked the intake manifold bolts and they are loose again.  I torqued them a couple months ago.  Should something like locktite been installed on the bolts when they were first installed to keep them from backing out?  Do I need to pull each bolt out to put on the coating and then reinstall/retorque them?

 

Thanks in advance.

[superdave160]

I used my scanner to record some data.  It took 81 snapshots of data over several seconds.  I can see the timing varying wildly.  The other thing that I see in the logs is that the fuel trims are all negative, so it is pulling fuel.  If I had a vacuum leak, wouldn't the fuel trims be positive because the computer would be adding fuel to compensate for the extra air?

 

I read somewhere that knock sensors can cause the computer to pull timing.  I could not see the capability to monitor them in my scanner.  How do you monitor the output from the knock sensors?

 

Thanks

truck data log.docx

[Laylow_lalo]

I have a 2008 gmc sierra Denali 6.2 awd and I bought it with a bad engine, the engine was no good for a rebuilt so I bought another engine off a 2012 Yukon that had original dod, but mine didn't so I did a dod delete and refreshed the whole engine, now I never drove the truck before I bought it so I don’t know if it was already like that so I asked the seller and he said trans was rebuilt February 2025 and still has warranty he also did a engine rebuilt but got locked up do to bad oil pump wich was reason for selling it, he said that furring the time he had it running it was also kicking and transmission shop said it was normal do to the tune that it has on 93, the issue I have is that it shift hard in very gear when I drive it normally and it pulls me back, put my autel and have pressure sensor codes, I asked around and they said that the transmission probably need to re Learn values, could the issue be the re learn or the new 2012 engine or the transmission itself self I need help