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I have 1991 buick century
A couple of possibilities come to mind.
I'm not sure how your filter installs, but if it connects above the fluid level, it could draw air if not sealed correctly. This would reduce the pressure needed to shift.
The second possibility is that the transmission range sensor is out of adjustment such that the transmission is in low 2 when you want it in drive.
on Nov 10, 2017
Transmission , idle, check engine
My 1st suggestion would be to get a scan done for the check engine light. I'm not talking about a simple 'code reader' but an actual scan tool so all of the different sensors and perimeters can be read. You will need to get one or find someone with a scan tool which can do OBD I vehicles.
If the engine isn't running correctly this could cause the transmission not wanting to shift. 2 vehicles that come to mind where I've seen this happen.
One was a Pontiac and it wouldn't shift into overdrive. Problem was the thermostat which was stuck open and it wouldn't allow the engine to get up to proper temperature which kept the transmission from shifting.
The other was a Ford Explorer that the lady thought for sure the transmission was bad. After a test drive and investigation it was found the catalytic converter was mostly plugged which wouldn't allow the engine to achieve the proper torque and RPMs to get the transmission to shift.
Now granted neither of these examples are an exact duplicate of the problems you are having. They are simply to illustrate that engine performance (or the lack of) CAN affect the way the transmission shifts.
Hope this helps.
on Oct 05, 2017
1991 Buick Century Limited 3.3L, 94,300 miles; stalls under load.
There should be a purple wire with white tracer from ignition module to computer. That wire carries rpm signal to computer, w/o that signal, the computer won't ground the fuel injectors. With the engine cranking, you look for a dc pulse on that wire. If you have a digital multimeter that has a tach--duty cycle or dwell setting, it should react to a dc pulse.
My info on your model year, isn't that great.
on Apr 27, 2017
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