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Diesel Ad Rollngo Caddy
Engine runs rough at idle



Engine is cold

Allow the engine to warm up to operating temperature. If engine will not reach operating temperature refer to manual

Idle speed is set too low for accessories

Check and adjust the low idle screw

Engine mounts are over tightened, damaged, or loose

Verify the condition of the mounts. Refer to the equipment mfger's service instructions.

High pressure fuel leaks

Inspect the high pressure lines, fittings, or delivery valve seals and repair if necessary

Air in the fuel System

Bleed the fuel system and check for suction leaks.

Malfunctioning fuel return overflow valve

Check/replace the return overflow valve

Fuel transfer pump malfunctioning

Check/replace the fuel transfer pump

Fuel supply restricted

Clean the pre-filters and screens and check the fuel line for restrictions.

Valves incorrectly adjusted (valves are not sealing)

Check and adjust the valves

Engine Compression is low

Perform the compression check to identify the malfunction

Injector needle valve sticking

Check the injectors and replace any malfunctioning injectors.

Fuel injection pump malfunction/delivery valves malfunctioning.

Remove the fuel injection pump and repair or replace as necessary