Heavy Duty Equipment Technician Red Seal Exam Prep · Question
An articulated dump truck exhibits a persistent 'check engine' light and logged DTCs for multiple cylinder misfires (P030X codes). After confirming injector and spark/glow plug functionality, and performing a compression test that reveals low compression in multiple cylinders, what is the most likely and comprehensive repair decision?
Low compression in 'multiple' cylinders, especially after ruling out common ignition/fuel issues, strongly indicates internal engine wear such as worn piston ri
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Question: An articulated dump truck exhibits a persistent 'check engine' light and logged DTCs for multiple cylinder misfires (P030X codes). After confirming injector and spark/glow plug functionality, and performing a compression test that reveals low compression in multiple cylinders, what is the most likely and comprehensive repair decision?
Answer options: ✅ Perform an engine overhaul to address internal wear and rebuild the affected cylinders.
- Replace the engine control module (ECM) to resolve potential software glitches.
- Adjust the valve lash and re-torque the cylinder head bolts.
- Replace the engine's fuel filter and air filter.
Correct answer: Perform an engine overhaul to address internal wear and rebuild the affected cylinders.
Explanation: Low compression in 'multiple' cylinders, especially after ruling out common ignition/fuel issues, strongly indicates internal engine wear such as worn piston rings, cylinder liners, or valve train components, necessitating a comprehensive overhaul.
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