The rpm or tac seems to jump from high to low on my 1996 ford taurus. this only happens when car is at a stand still and seems to be worse in colder conditions. my first thought was the torque converter but i don't wont to fix anything without being sure. any idea what this could be?
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The low pressure switch is located near the rear. If you locate the accumulator assy, it is on that line that goes to the firewall to the evaporator, it has two wire to it, if you unplug it and jump the two terminals at the connector the a/c clutch should engage...you can do when car is running, if it does then either you lost your charge or the switch is no good, switches are very rare, if it does not engage, then you either have bad wiring to the a/c clutch or the coil inside the clutch assy is no good and must be replaced...jump the switch and let me know where you stand at that point and i can offer more support
Most likely Idle air control valve fault. Usually wont set a code unless it has a short or unplugged. There are some test that can be performed with a high end scanner but with out the data not much you can do.
Sounds like you have some trubble with your electronics. Probably need to hock it up to diagnose it. I would guess that the electronics in your car sends the wrong information to your gearbox, and therefor "lureing" it to downshift. It culd have something to do with the kickdown aswell, but since the gauges act the way they do, It seems more likely to be caused by the electronics.
1st thing to do is check the automatic trans fluid level, if it is full (check hot only!) then the trans clutches have fried and the trans will have to be replaced or torn down and repaired.
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