Introduction
This document provides information on monitoring exhaust gas temperature (EGT) in a Toyota Prado, including recommended temperature limits and factors that influence EGT. It’s crucial to monitor EGT to prevent engine damage, particularly in alloy head engines.
Problem
Excessive EGTs can lead to engine damage, including potential meltdown of pistons and terminal stress to the cylinder head. Determining safe EGT limits for a Prado is essential.
Solution
Install an EGT gauge with an alarm to monitor temperatures upstream of the turbo. It is recommended to set the alarm at 720°C. If the alarm sounds, reduce throttle input or shift to a lower gear to lower the EGT.
Relevant Considerations
- Alloy Head: Due to the alloy head construction, coolant temperatures should ideally be kept below 100°C.
- Factors Influencing EGT:
- Driving at full throttle towards redline.
- Driving uphill in 5th gear, especially with cruise control engaged, even with slight inclines.
- EGR Blanking: EGR blanking is unlikely to significantly affect EGT readings. It primarily stops blowby gases from being recirculated into the intake.
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