Isuzu N 2008 Series Workshop Manual page 347

1A-344 Engine Control System (4JJ1)
Checks
Engine Mechanical Checks
Electrical System Checks
Inspect the engine mechanical for the following conditions. Refer to Section 1B Engine
Mechanical.
• Poor cylinder compression.
• Improper mechanical timing (timing gear and timing chain).
• Improper valve gap.
• Broken or weak valve springs.
• Worn camshaft lobes.
• Thermostat working (open stuck).
• Any excessive oil entering combustion chamber.
• Glow plug control (preheating) system operation. Refer to Glow Control System
Check in this section.
Action