Thermal Ignition Control

Thermal Ignition Control (TIC) is a device employed by Chrysler to manage the ignition timing in internal combustion engines. Here’s a breakdown of its operation:

1. Function: The primary function of the Thermal Ignition Control system is to regulate the ignition timing based on the engine’s coolant temperature.
2. Shift in Vacuum Advance Source: The TIC device accomplishes its task by shifting the source of vacuum advance from ported vacuum to manifold vacuum under specific conditions.
3. Coolant Temperature Threshold: When the engine’s coolant temperature exceeds a certain threshold, typically around 107°C (225°F), the TIC system triggers the shift in the vacuum advance source.
4. Manifold Vacuum: By utilizing manifold vacuum, the TIC system adjusts the ignition timing to a setting suitable for high-temperature operation. Manifold vacuum is generally more consistent and provides better control over ignition timing compared to ported vacuum.
5. Advantages: Shifting to manifold vacuum at elevated coolant temperatures allows for optimized ignition timing, which can help prevent issues such as engine knocking (pre-ignition) and overheating.
6. Implementation: The TIC system is typically integrated into the engine’s electronic control system or as a standalone component, depending on the vehicle’s design and model year.
7. Impact on Performance: Proper management of ignition timing through systems like TIC can improve engine performance, fuel efficiency, and overall reliability, especially during high-temperature operating conditions.

Overall, Thermal Ignition Control serves as a sophisticated mechanism for adjusting ignition timing in response to coolant temperature variations, contributing to the efficient and safe operation of the engine, particularly in challenging environmental conditions.