Isuzu N 2008 Series Workshop Manual page 330

Checks
Exhaust System Checks
Engine Mechanical Checks
Electrical System Checks
Inspect the exhaust system for a possible restriction. Refer to Exhaust System in
Section 1G Engine Exhaust.
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.
Inspect the engine electrical for the following conditions. Refer to Section 1E Engine
Electrical.
• Glow plug control system operation. Refer to Glow Control System Check in this
section.
• Slow cranking speed.
• Weakened batteries.
Engine Control System (4JJ1)
Action
1A-327