Before reading my story below I wanted to say Trifecta is a great tune the issues I had with my car are from operator error. I did not have the NLS feature in my tune.
I've owned 3 Solstice GXP's over the years. Two 2007 Solstice GXP Autos and one 2007 Solstice GXP 5spd. 1st 2007 Solstice GXP Auto I had GM tuned great car first owner but it was totaled in an accident unfortunately. Then I picked up another 07 Solstice GXP Auto a few years later and tuned it Trifecta. Both cars ran great never had issues with Trifecta on the Auto.
Then I traded in the auto 6 months ago for a 2007 Solstice GXP 5spd. Had it trifecta tuned it ran great but I missed the constant boost the Auto delivered even when shifting to the next gear. I learned about No Lift Shift on the forum but did not thoroughly research the feature. I got good at performing NLS but noticed it would throw a CEL sometimes while doing it.
Two months ago took the car for a spin warmed it up and did a series of NLS 1 - 2 - 3 then when I went into 4th CEL light starts blinking. Car stumbles, misfires like crazy and shows the reduced pwr light.
I change my Plugs still misfires and then all 4 coils still misfires. Trip to the dealer shows low compression on Cyl 1. A valve dropped and damaged Cyl 1.
I later read on Trifecta website not to use the NLS feature when running their tune (unless NLS is built in)
. I actually found out NLS should not be performed on any tuned Solstice GXP 5spd because the higher boost (unless boost pull-back is re-instated at high rpm).
Thought I would share my information and hopefully save a fellow GXP owner from damaging their car.
Good news my Solstice is up and running again after getting repaired at the dealer for the past 3 weeks.