• The site migration is complete! Hopefully everything transferred properly from the multiple decades old software we were using before. If you notice any issues please let me know, thanks! Also, I'm still working on things like chatbox, etc so hopefully those will be working in the next week or two.

Downshift???

T

TheNoob23

New member
I have an 04 GP GT and when I'm driving and go WOT it will get to 90mph and then just sit there while its at like 6k-7k RPMs. To go over 90 I have to release the gas and then slowly push it past 90 but right when I go WOT when I'm over 90 it downshifts and gets stuck at 90. I'm pretty sure this isn't normal but does anyone have any ideas what is causing this? :confused:
 


Please confirm that 6-7K rpm. If so, your pcm has something changed in it. This may explain the lack of a shift into the next gear.
 
Well I don't think its the new pcm because it would do the same thing before when I had the stock one except it did it when I hit 90 instead of at 100
 
So... Just to be clear, this happened with your stock pcm and the DHP?

If so its probably a trans issue. I would say trans pressure???

Edit: Ninja'd you answered the first part.
 


I would take it to a tranny shop if you don't know transmissions. It could be as simple as a hole in a line or something as complicated as a gear being ground down, but I'd let a pro figure it out.
 
Ok thanks. Also I had the transmission fluid flushed when I first got the car and it had 134k on it. Could they have messed up or something?
 


No...that won't do anything but make the differential stronger.

It's in the tune...are you sure the PCM was year specific? I bet your car is doing the same thing mine did...mine is an '03 and had to have a year specific PCM since the transmissions are different internally.

Then again...just to be on the extreme end...what are the mods done to the car? Just a PCM? Other thing might be some CRAZY knock levels.
 
Well I bought the DHP pcm for the 2004 gp. and I dont think it would be the pcm since it did the same thing with the stock pcm but then again I am a noob
 
You must log in or register to reply here.
Back
Top