Understanding Why Your 1999 Town Car Transmission Isn’t Coasting
The 1999 Lincoln Town Car is renowned for its luxurious ride and powerful V8 engine. However, some owners have reported an issue where the transmission does not coast, meaning the car continues to accelerate even when the gas pedal is released. This can lead to decreased fuel efficiency and make driving more difficult, especially on hills.
Causes of a Non-Coasting Transmission
There are several potential causes for a transmission that does not coast. Here are some of the most common:
Torque Converter Issues
The torque converter is a fluid coupling that connects the engine to the transmission. A worn or damaged torque converter can cause the transmission to engage even when the gas pedal is not being pressed. This will result in the car continuing to accelerate, even when you want it to coast.
Governor Pressure Sensor
The governor pressure sensor monitors the speed of the transmission and adjusts the hydraulic pressure accordingly. A faulty sensor can send incorrect signals to the transmission control module (TCM), which can lead to the transmission not coasting properly.
Speed Sensor
The speed sensor measures the speed of the vehicle. A faulty speed sensor can provide incorrect information to the TCM, which can cause the transmission to shift erratically or not coast at all.
Transmission Control Module (TCM)
The TCM is the brains of the transmission. It controls the shifting and operation of the transmission. A faulty TCM can cause a variety of transmission problems, including the transmission not coasting.
Diagnosing the Issue
To diagnose the cause of a non-coasting transmission, it is important to have the vehicle inspected by a qualified mechanic. The mechanic will perform a series of tests to determine the root of the problem. These tests may include:
– Fluid level and condition check
– Torque converter inspection
– Governor pressure sensor testing
– Speed sensor testing
– TCM diagnostics
Repair Options
Once the cause of the non-coasting transmission has been diagnosed, the mechanic will recommend the appropriate repairs. These repairs may include:
– Torque converter replacement
– Governor pressure sensor replacement
– Speed sensor replacement
– TCM replacement
– Transmission rebuild or replacement
Preventative Maintenance
To prevent future transmission problems, it is important to follow a regular maintenance schedule. This includes:
– Regular fluid changes and filter replacements
– Transmission fluid level checks
– Transmission filter cleaning
– Transmission pan inspection
– Torque converter inspection
Conclusion
A transmission that does not coast can be a frustrating and expensive problem. By understanding the potential causes and following a regular maintenance schedule, you can help prevent this issue from occurring. If you notice any problems with your transmission, it is important to have it inspected by a qualified mechanic as soon as possible.
