Hey guys.
I'm still having issues after my last dyno tune. I installed 42.5lb injectors, 3" exhaust and 1.9 RRs so that I could drop to a 3.0" pulley (I have all other supporting mods) - 2006 Grand Prix GT
Basically what happens is when I'm on the highway the car will go into "reduced engine power" as soon as it gets under load from a cruise (cruising at 55-60mph and then try to pass a slower car). It throws a P0068 code as well. You basically only have to get into the throttle 5-10% for it to trigger the issue. It's getting VERY irritating and gives a pretty unsafe feeling driving on the highway.
I've tried a different MAF, cleaned the throttle body, tried a different throttle position sensor, replaced the vac lines from MAP sensor to boost solenoid and tried just about everything before calling the tuner back (it's a pain to get the car to him)
I'm just wondering if with the mods I'm running if I'm maxing out the MAF table and causing the power loss issue. I have an LQ4 MAF that I can throw in but obviously there's a little work and a retune there.
Any ideas would be greatly appreciated. I'm done banging my head against the wall here and just wanna know if it's actually in the tune or not.
Thanks guys