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Poor Performance Or Black Smoke

Poor Performance Or Black Smoke

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


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