[pault_99]

Sounds like you have the Z16XER or Z18XER.

You MUST use 5w/30 DEXOS2, and you must have the engine ECU iVVT adaptions cleared at every oil change. As an owner on here just found out yesterday. Now his car is running 100x better. A GM TECH2 is required.

 

[pault_99]

OpCom does not do the iVVT reset. For this you need TECH2.
Its under Engine, Programming, Reset Learned Values, and iVVT Reset.

 

[pault_99]

Actually Ive found it. It was general reset learned values on OPCOM as valer said. After that, car needed 12 seconds to start the first time, like some calibration.

All it did was reset the Idle adaption. It has been proven on here before that OpCom does not reset the iVVT.
Just had a member on here visit me this weekend to have this done. He is now shocked at the difference. Especially low rpm driving.