NTC-13B: Checking Engine Mechanical Systems

At this point in diagnostic test procedure, all engine control systems have been determined to be operating as designed and not causing a driveability problem. Following additional items should be checked as possible causes:

• Check fuel injection pump for malfunction, misadjustment or incorrect pump timing
• Check for air in fuel system
• Check for restricted or damaged injector nozzle
• Check for improper fuel
• Check for clogged fuel filter
• Check for blocked or restricted fuel injection lines
• Check for leaking or damaged fuel injection lines or loose connections
• Check for empty fuel tank or blocked fuel tank vent
• Check for clogged or restricted air filter
• Check for blocked or leaking intercooler
• Check for low or uneven engine compression
• Check for misadjusted low idle
• Check for throttle lever not reaching full throttle position.