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Diesel Ad Rollngo Caddy
Engine speed surges at low or high idle

Cause

Correction

Fuel level low

Check/fill the tank

The condition occurs at idle, the idle speed is set too low for accessories

Adjust the idle

Throttle linkage mis-adjusted or damaged

Adjust or repair the linkage

High Pressure fuel leak

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

Air in the fuel system

Bleed the fuel system and check for suction leaks and check for malfunctioning supply pump

Injectors worn or malfunctioning

Check the injectors and replace any malfunctioning injectors.

Fuel injection pump malfunctioning/delivery valves malfunctioning

Remove the fuel injection pump and repair or replace as necessary