Ok, heres the story. I'm coming home, and everytime I go WOT, the car will shift at 4500 rpms in first? This just started happening after I replaced my stock alternator with a 200 amp alternator. I replaced the charge wire with 4 gauge wire. I also replaced the serpentine belt tensioner because the belt was making noise, but that didn't fix the squeaking belt.

Other info: I just had my transmission replaced with a new rebuilt transmission in April. It has been working fine, up until I replaced the alternator.

What would cause this? I have not upgraded the ground wires to 4 gauge, could that cause this? Can a worn serpentine belt cause this? Any help would be appreciated.

 

Can you confirm that pedal to floor = WOT on the TB? Maybe when installing all that you damaged, or affected in some way, the TPS. Maybe the PCM only thinks your at 3/4 throttle. Just a thought

 

I'll have to check tomorrow, but I highly doubt it could be the sensor because its at the throttle body right? I only replaced the tensioner, which is on the far left of the engine, and the alternator, which is underneath.

I've been thinking about this all night, and thinking back, when the belt was squeaking bad, I sprayed a little bit of SLP Belt Dressing on the ribs of the belt, could the belt dressing be causing the belt to slip under heavy acceleration??