Low miled 2002 Gmc Envoy XL SLE 4x4 few problems

Asked by Oct 17, 2019 at 02:44 AM about the 2002 GMC Envoy XL SLE 4WD

Question type: General

Hello all of a sudden it wasn't the same as I
bought. First had trouble in drive then was better in
d2. Then a day later worked better in drive?

Go over 45 & nothing until it catches the gear. A
week later we lost Reverse. Got in the next day & it
wouldn't move learned how to reset the computer
& by switching it from 4hi to 2wd accelerate take
foot off pedal & it begins to role.
Has to make the sound of changing into 4hi & back
before it works.
Also turning it 3/4 of the way putting it in P then to
d1 back to park then D1 & back turn on turns on.
.wondering if there's a way to reset the reverse like
I did to get it to go forward?

Now my exhaust makes such a loud sound then
goes away. 35mph to 40mph revs to 4000 rpm
before it'd rev to 4krpm but if do 60 4.5 to 5 to go
70. Now not even close 50 plus sometimes
reaches 5000 rpm.

Have a few ideas on what it could be. Any ideas
because it's only got 108k miles 2002 bought it off
the internet? Could it be the module?
Doesn't over heat. Check engine light stays on.
Had brand new new tires very clean.
Overdrive doesn't work. As you know. also Cruise
control comes on once a day.

Also when left idle for 30 minutes doesn't move till
I play with it.

Have you heard of an 02 needing a transmission
with 108k miles?
Maybe a way to reset the computer? Pump? 3&4th
gear for the trans?

Sorry for the confusion. Checked the fluid both oil
& transmison no leaks both are full.
A.c. doesn't cool but may need to recharge.

Any and all thoughts please let me know. My dad
would word this better having many years in the
automotive business. I apologize.
Thank you. 215 452 8745 have someone to update
as well with there's any and all help will not go
unnoticed. Thanks Berj Yepremian

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