The vehicle may lose vehicle speed signal, which can affect speedometer operation and transmission shift quality. Most often the Vehicle Speed Sensor is faulty, however, at times, the driven gear inside the transmission is at fault. Replace the Vehicle Speed sensor and inspect the driven gear upon sensor removal.
Resources for the Repair and Maintenance of your 1990 Mercury Topaz
1990 Mercury Topaz
1990 Mercury Topaz Problems
If the throttle lever is out of adjustment, or the grommets are missing / broken at the throttle or transmission, the automatic transmission can shift hard. Replace the grommets as needed and adjust the throttle lever.
Poor rubber material used in the motor mounts can cause them to fail, leading to a knocking noise or lifting sensation on acceleration. The motor mounts will need to be replaced with revised parts.
Fuel pump failure can cause the engine to crank but fail to start. Diagnosis will show insufficient, or no fuel pressure, and fuel pump in the fuel tank will need to be replaced.
Internal heater blower motor issues can cause a ticking noise from the heater blower when the fan is on. To correct this concern, replace the heater blower motor with a revised unit.
1990 Mercury Topaz Questions and Answers
how do i change my water pump
I have a 1989 Mercury Topaz and recently had to have the driver belt replaced A couple of days later the belt came off the person was not my regular mechanic and continued to make excuses about w...
It is leaking oil and over heating.
After traveling for 5 miles or more on highway the car will stall as you stop then has a bear of a time restarting. It happens only after traveling on highway, not in city. Can anyone help please...