So I installed a GM cold air intake about a month ago and had the dealer load the tune. Since the “tune” was loaded the truck’s fuel mileage dropped 2-3 mpg and the check engine light keeps coming on. Each time the light comes on my Onstar states an emission related issue. The first issue was a vacuum leak at the MAF, then the next was an O2 sensor that needed to be replaced and who knows what it is now. Is it possible the dealer did not load the correct tune into the ECM when the CAI was installed? I would be interested to hear everyone’s thoughts on this issue.
I have the Pedal Commander on my 19 AT4 6.2. I also had one on my 16 AT 6.2. Definitely worth the money. I bought 420 hp and I want to feel 420 hp, none of this pedal lag crap! Go buy one and put a smile on your face every time you accelerate!
Pulled the trigger on a new satin steel AT4 this morning. MSRP was $64,995 price paid $55032 less trade for my 2016 Sierra 4x4 AT $36,712. I walked out paying $18,500. Pics will be coming next week.
Can any T1 non NHT owners confirm that the 9.76” rear end is installed on their truck if equipped with the 6.2L? It is stamped on the rear end by the yoke. My dealer has no idea? ? My 2016 AT 6.2L has the 9.76” but before I pull the trigger on a new AT4 I want to confirm the 6.2L still gets the 9.76” rear end. Thanks!