Isuzu N 2008 Series Workshop Manual page 345

1A-342 Engine Control System (4JJ1)
Checks
Engine Mechanical Checks
Additional Checks
Inspect the engine mechanical for the following conditions. Refer to Section 1B Engine
Mechanical.
• Inspect for poor cylinder compression.
• Improper mechanical timing (timing gear and timing chain).
• Improper valve gap.
• Broken or weak valve springs.
• Worn camshaft lobes.
• Any excessive oil entering combustion chamber.
• EGR system operating correctly. Refer to EGR Control System Check in this
section.
• Excessive blow-by gasses.
Action