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.