1998 Pontiac transport mini van 3.4 V6.
Warning lights =
check engine light.
Codes P0187..P0122...P0420 PD
Replaced transmission vacuum modulator.
Question = Okay. I stopped to get gas at the
station. My car was running perfectly before then.
Started car again and car would not move in drive
even though the rpms were high. Placed car in
first gear and lightly stepped on gas pedal as car
slowly moved. After slowly moving i have to go
from first to second and lightly step on the gas.

If there is too much pressure on the pedal the
rpms will rev up high and the gear will not engage.
With light pressure the gear will engage and
accelerate as normal. Then i switch from second
to third and car will maintain same speed and will
increase with light pressure on gas pedal. If i place
too much force again rpms will rev high and gear
will seem as if it is not engaged. Placed car from
third into drive and current speed will remain the
same and increase with light gas pedal pressure.
Once again too much pedal force and it revs at
high rpms again and will not stay engaged(or feels
like it). Tranny fluid is at normal level requirements!

And red in color. Tranny fluid does not smell
burned. Reverse works fine with no problems.
Replaced PCV VALVE and checked vacuum line
hose for cracks or leaks. None found. The next
step i am considering is replacing tranny fluid and
filter. Then possibly testing tranny solenoids?
Well, just sounds like the
transmission slipping and needs to
come out and get repaired or replaced. Solenoids would not do
this except for the pressure control solenoid. Line pressure would
need to be checked to determine this.

Hitting the gas harder and it wont move means something
internally is slipping. You could remove the pan and change the
filter and fluid, but that will most likely not help, other than give you
an idea if there is debre in the bottom of the pan.

A failed forward sprag, clutch assembly, sunshell, or other hard
part is likely. Debre would be throughout and also in the valve
body, which may be some of the cause of your problems.
Pontiac Transport Transmission Codes And Slipping

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