Possible Causes & Corrections

Check the following items:

• Restricted air intake. Remove restrictions.
• Plugged fuel filter. Remove restriction and/or replace filter.
• Faulty PCM operation. See appropriate SELF-DIAGNOSTICS article.
• Improper fuel return system. Check fuel return system.
• Restricted tank-to-pump fuel supply. Check fuel delivery system.
• Incorrect or contaminated fuel. Remove and replace fuel.
• Faulty EGR operation. Check EGR system.
• Worn camshaft or valves. Repair as necessary. Check compression and valve lift.
• Nozzle or glow plug compression leaks. Check fittings, and replace as required.
• Plugged nozzle. Remove restriction and/or replace nozzle.
• Worn or damaged turbocharger turbine wheel, shaft or compressor wheel (if equipped). Repair or replace turbocharger assembly.
• Faulty TCC or shift points. Check transmission operation.