speedo cable?
Trottle sensor...
Output speed sensor is bad. Changed already
Does the speedometer work? Sounds like the electrical connector from the transmission to the PCM is either not plugged in correctly or at all.
The speedometer signal comes from the rear axle abs sensor. The PCM has nothing to do with it. You need to check the wiring from the rear axle to the abs computer.
It will need to be recalibrated at a shop that specializes in speedometer repair.
First, make sure the vehicle has the right size tires. Look on the door plate or in the glove box to find the size recommendations. If the tires are sized correctly, the speedometer cable gear can be changed to affect the speedometer displayed speed. Remove the cable where it enters the transmission tailshaft, count the number of teeth and get a different size gear depending on whether you want the speedometer to display faster or slower. If the speedometer is showing slower than you are actually travelling, get fewer teeth on a replacment gear. If the speedometer is showing faster than you are actually travelling get a gear with MORE teeth on the replacment gear.
No.
On a 1989, the speedometer signal comes from the sensor in the housing where the passenger side axle shaft goes in the transmission.
The 2001 Cavalier has the regulator built into the alternator. As this is an integrated component the alternator and regulator are changed as a single unit.
When it quits working and the cable isn't broken.
If it's overheating, it cold be thermostat, radiator or possibly other problems. If it's not overheating it could be the coolant level sensor.
check or replace thermostat