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Very long shifts in all gears. Over 1 sec "delay"

H

hewta

New member
Just started today, 99GTP started taking a very long time to shift in all gears. When the car is ready to shift it disengages the current gear, theres a 1-2 second delay, then it goes into the next gear. It will shift smooth if I hold the throttle steady, but giving it any gas during this delay will cause it to shift hard into the next gear. Its completely free revving during this delay, giving it more or less throttle doesnt affect vehicle speed.

Did pan drop around 500 miles ago. Fluid was pretty dark, but didn't smell burned. Shifted perfectly smooth before today. Should mention I disconnected the battery today for a few hours, and it does have a tuned PCM, though I dont think this would affect it. I drove to the store after batt was reconnected and it drove fine. Doesn't slip during WOT runs in any gear. The problem started on the way home around 10 min later. Trans runs between 195 and 215* F. No codes.

Any suggestions would be great. The cars in a lit garage I can go outside to do any recommended tests or take pics.

Thanks
 


Grabbed some shift time numbers:



1-2 Shift- Shortest= .9s Longest= 1.4sec
2-3 Shift- Shortest= 1.1s Longest= 1.5sec
3-4 Shift- Shortest= .3s Longest= .5 sec

1-2 and 2-3 are extremely slow, feels even longer than 1.5 sec, but 3-4 looks right. Any ideas what could cause this?
 
Probably pressure or pressure soleniod related. Reason I say that is, unhooking it and making it relearn adaptive shifts reset it.
 
hewta said:
Grabbed some shift time numbers:



1-2 Shift- Shortest= .9s Longest= 1.4sec
2-3 Shift- Shortest= 1.1s Longest= 1.5sec
3-4 Shift- Shortest= .3s Longest= .5 sec

1-2 and 2-3 are extremely slow, feels even longer than 1.5 sec, but 3-4 looks right. Any ideas what could cause this?
Click to expand...

I kinda have the exact same problem with my 2002 Grand Prix GT.
What exactly is dropping the pan?
I'm cartarded... :/
 
Dropping the pan. By removing the bolts on the transmission pan, the pan will "drop". Its the only way to drain the fluid out of the transmission for a fluid change, because the original pan doesnt have a drain plug.
 


Ohh.. Okay I totally got it now.
I can change spark plugs and the oil.
Does flushing the transmission fluid take much skill?
Basically I'm asking, how bad can I mess up my car?
 
the one concensus is DO NOT FLUSH THE FLUID! Simple drain and fill ONLY.. doing a flush is usually at a shop where they use high pressure to "flush" and get all of the fluid. That will sometimes take whatever is inside the filter and blow it back into the trans, causing damage.

Super simple to do a drain and fill. Drop pan, wait, pull old filter out, put new one in, clean magnet in the bottom of the pan, and put pan back on. Toss in 7-8 quarts of tranny fluid and you're good.

There's a how-to for this process in the how-to section.. Just search for a trans filter change posted by bill boost. I think he also did a shift kit install.

If you can change spark plugs, a shift kit and trans fluid and filter change should be easy enough, no harm done.
 
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