I wanted to update this for people that search similar issues. I checked all grounds etc and for any cracked wires etc, I purchased a ls3 90mm TB and it fixed this issue so far. I've done 10 or so WOT runs and no problems since. Wierd

 

Thanks for the Update.

I have seen this happen a few times now were replacing the Throttle Body with a brand new one fixes the issue.

It seems either the motor's weaken over time or the gears wear. Either way the problem usually show up more often on Forced induction set ups rather then NA.


Glad you got the issue resolved!

 

I wonder if it could be related to current draw, and there is no code for that. I recall that the datasheet for the motor driver in the TAC module says it is rated for either 5 or 6 amps. It and/or the TAC module, will shut down if that is exceeded. I know that if I set the current limit on my twin throttle controller to 5 amps, it will shut down at WOT on a 90mm TB, engine off. So it draws that much just to fight the spring. The wider it opens, the greater the current draw. Could be drawing a little more trying to maintain throttle position when there is a lot of airflow.

 

Any thing is possible. Would you have time to test your theory if some one sent you a known bad TB??? Unfortunately everyone I knows just trows them in the trash since there know good.

I sure would like to know.

 

If the TB is not setting any sensor codes, I guess someone could compare the current draw on the ETC circuit to that for a known good TB to see if the bad one is higher.