Thats a good point, I can't remember if it was really hot or not.

 

Well i let the tank go down to an 1/8th of a tank and filled her up. No issues. it was much cooler out, and the pump was going slower than the other stations. But during the drive, holding the pedal steady, the turbo was boosting a couple lbs all by itself then drop and then boost again a couple lbs. then i slowly stepped into WOT and boost wouldn't go past 5psi and fuel pressure would only go to 1100psi, i would let off and it would go away. very strange.

 

Is the car running in limp mode? When mine went into limp mode, 5psi was all the boost it could do. Acceleration was slow, but you could still drive at 80mph. You may have TMAP sensor problems. Try unplugging the upper TMAP while the engine is off and reconnecting it. Strange that you have no CEL or codes coming up. The lower TMAP is harder to see, but a small mirror or digital camera can show if something is going on down there like a dislodged sensor or abraded wiring near the A/C compressor contact area. I was having a weird problem and used my camera on the lower TMAP to find an issue. Dealer corrected mis-install and also replaced the crimp connections with soldered. Trouble free for 12+ months now. The symptom exhibited by the engine with the sensor like this was that it ran normal when driving normally, but when you got on it it screwed up because the charge pipe pressure was able to bypass the little o-ring while under boost and it messed up the sensor signal into the ECU and there was a loss of power. Why GM didn't orient the lower TMAP in line with the charge pipe and allowed the close spacing to the A/C compressor is a mystery.

 

Sidecardog1. Is that the Bosch t-map sensor with the GMTU kit? If so, looks like the tech didn't trim off the tab on the sensor.

 

5psi and slow acceleration is exactly what is happening. But no check engine light. I did run a Tech 2 on it and it had a P0106 code stored. I will try undoing the upper TMAP sensor and see what happens. Another thing happened today, my boost gauge would not register any boost. sounded like the turbo was spinning and the BOV was working, it wouldn't tell me on the screen though.

 

Sounds like bad map sensor or wiring

 

Yes, that is exactly what happened. I had a sensor go bad and the dealer ordered and installed a new one (yes, it is the GM power upgrade). Apparently when the new sensor came in it was without instructions, so the tech didn't pick up that the tab needed to be removed. As soon as I had the problem, I investigated and saw the condition in the picture that I took by holding my camera up under the bumper until I got the money shot. I brought the car back along with the instructions that I still had from the upgrade plus the photo. They fixed it quickly !

 

OK, 10RedSS, that is the symptom of what happens when either the upper TMAP sensor is F/U or the connector got nudged during an oil change. Unplug that upper TMAP and then plug it back in making sure it is fully engaged. Hopefully that will correct your problem. Go for it. With the motor shut off, simply disconnect the sensor plug and then reconnect it. All you are doing is making sure all the pins are making contact.

 

well i unplugged it and there was a little bit of oil in the sensor and a little bit on the male end that goes into the sensor. i wiped it off and plugged it back in. i haven't gone for a test run yet. should there be oil in there?

 

No, there is not supposed to be oil in there and that could very well be your problem if it indeed was oil and not dielectric grease. If it was oil, it may have been from an oil filling operation whoops, or from drips from a filter being lifted out. In any event, hope this works for you.