What critical engine condition can be determined by monitoring the rise in EGT after starting?

Monitoring the rise in Exhaust Gas Temperature (EGT) immediately after starting an engine is a vital indicator of successful ignition. When an engine is started, the EGT should increase as the fuel-air mixture ignites in the combustion chamber. A rapid rise in EGT confirms that the combustion process has successfully initiated, indicating that the ignition and subsequent combustion are functioning as intended.

If ignition does not occur or is delayed, the EGT will not rise appropriately, signaling a potential issue with the ignition system or fuel delivery. This immediate feedback is essential for early detection of ignition failures, making it a crucial parameter to monitor during the engine start-up sequence. Successful ignition is therefore a critical engine condition that can be directly assessed through EGT behavior right after starting.