Possible Cause

Possible Remedy

Air in fuel system

Bleed fuel system, eliminate air leaks

Injection lines blocked/restricted

Drill to nominal I.D. or replace

Pump-to-engine timing incorrect

Readjust timing

Injection nozzle defective

Repair or replace

Governor misadjusted or defective

Readjust or repair

Fuel injection pump defective or cannot be adjusted

Remove pump and service

Engine air filter blocked

Replace air filter element

Injection sequence does not correspond to firing order

Install fuel injection lines in the correct order

Timing device defective

Repair or replace timing device

Low or uneven engine compression

Repair as necessary