Having Trouble with Your Diesel? We’ve Got Answers

Check out some of our the most common problems and solutions with Diesel Engines.

Need help troubleshooting your turbocharger? Click Here

Engine speed surges at low or high idle

-Air in Fuel System
-Injection Pump malfunctioning
-Delivery Valves in Injection Pump malfunctioning
-Injectors worn or malfunctioning
-Fuel Leak….Repair fuel leak
-Throttle linkage out of adjustment or damaged
-Idle setting

Note: If this is a generator application, additional adjustments need to be made to the injection pump once installed. Contact Diesel Pro for Service Bulletin

Engine Difficult to Start

-Injection Pump timing
-Cylinders aren’t getting fuel
-Engine is out of time
-Injector(s) are worn or malfunctioning
-Injection pump is malfunctioning
-Engine has low compression
-Air intake or exhaust system is restricted
-Air in fuel system
-Engine cranks too slow. Minimum cranking speed is 150RPM

Engine has low power

-Fuel injection pump is malfunctioning
-Engine overloaded
-Low Compression
-Fuel control lever mis-adjusted
-Mechanical shutoff lever partially engaged
-High pressure fuel leak
-Fuel supply pressure too low
-Air in the fuel system
-Fuel transfer pump malfunctioning
-Malfunctioning fuel return overflow valve
-Intake air restriction
-Boost Leak
-Intake air restriction
-Exhaust restriction
-Exhaust Leak pre-turbo
-Fuel injection pump timing is incorrect
-Turbocharger worn or failed
-Valves out of adjustment
-Injectors worn or failed

Fuel in engine oil

-Engine valve train malfunction
-Injectors are worn or malfunctioning
-Injection pump seals are leaking
-Failed supply pump

White Exhaust Smoke

-Turbocharger worn or malfunctioning
-Injection pump worn or malfunctioning
-Injectors worn or malfunctioning
-Head gasket failure, coolant in combustion chamber
-Low compression
-Engine timing
-Poor fuel quality

Black Exhaust Smoke

-Injection pump malfunctioning
-injectors are worn or malfunctioning
-Turbocharger is worn or malfunctioning
-Restricted Air Intake
-Restricted exhaust
-Boost Leak
-Exhaust leak