First, let me say I am just getting into working on this car, I do simple stuff but I feel I am mechanically inclined and rather do my own work when I understand the problem. Please bear with my novice understanding of this vehicle.
I need help figuring out a problem with the 2000 GTP. For the last few weeks, there has been and increased whining noise. At first we thought it sounded like a fan rubbing against plastic, or a blower. We took the car the dealership when the check engine light came on, but it was off after we got there.
Those clowns took our $98 troubleshooting fee and said that the transmission was causing the noise.... never mind we told them it was something that got louder when increased throttle "in nuetral" and driving. So basically they told us the transmission is going out on the car.
Yesterday, I tried to figure out where the noise really was coming from, and had the wife start and stop the engine while listening. The best way I could describe the sound is: A wire brush rubbing against metal, or imagine a fan blade rubbing a plastic housing. so when the wife turned off the engine, the sound continued for a second and sounded like it was coming from the supercharger. like something was spinning down or the other thing that came to mind was something de-pressurizing.
I hope that is descriptive enough for some ideas.
So, I went ahead and replaced a tensioner pully that had started squealing and after doing we noticed the car started sputtering and died once when I came to a stop.
The MAF was replaced about 4 mos ago. And when unplugged it didn't seem to make a difference.
Drove the car last night and seemed ok, but I noticed when I entered the interstate and layed on the throttle, the boost indicator only went to the second level. So I went WOT a couple of times and it still only bounced between first and second level on indicator.
Then on the way home, while steady throttle on the interstate going 75mph, the car downshifted boost indicator jumped to 75% and stayed there for two miles until we exited. The car ran rough the last few miles to the house with the tach bouncing up and down and the car was bouncing between second and third gear. We thought it was going to die but we made it home.
I am wondering if it is a sensor that went out??
Please let me know your thoughts, and thank you in advance.
Regards,
Bill AKA Cartman68
