Torque converter cotrol.
It could be an issue with the torque converter.
The catalytic converter on a 2004 Pontiac Grand Prix is located under the vehicle. To remove it the bolts which connect it to the exhaust manifold must be removed. The bolts which connect it to the other piping will need removal as well. After all mounting hardware is off the converter will come off.
TCC (Torque converter clutch) Soleniod in the transmission is likely bad. Hope for that because if not it's a bad torque converter.
It is attached to the valve body inside of the transmission.
The 2001 Pontiac Grand Prix 3.8 liter engine intake bolt torque specification is 45 pounds. The intake bolts should be torqued in 15 pound intervals.
Torque specs for a 1996 Pontiac Grand Prix 3.1 is 185lb-ft of torque at 4,000 RPM.
The head bolt torque specifications, for your 2002 Pontiac Grand Prix, is 160 pounds per square inch. The head bolts should be torqued in 40 pound intervals.
10 lb ft
first get new head bolts. they are torque to yield. torque them to 37 ft-lbs and then rotate an additional 120 degrees.
It my just be down shifting 2nd answer: torque converter lock-up is having a problem?
I'm not finding Torque converter sensor, are you sure you don't mean converter check valve or converter clutch solenoid? anyway, if you are looking for any of the shift Selenoid (1-2,3-4, or 2-3), or the TCC Selenoid, or the TWM Selenoid, or the Transmission Temp sensor, These are located inside the side cover on the transmission. On my 1999 grand Prix se this cover is located above the Transmission pan and drivers side....