Guardian Engine Misfire / Hunting Under Load

Generator runs rough, surges, or misfires under load; lights flicker and engine speed fluctuates.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Dirty carburetor or fuel mixer, Restricted fuel regulator, Worn spark plugs, Clogged air filter

Safety first: Place the controller in OFF and open the main breaker. Allow the engine to cool before servicing.

Replace air filter: Install a new Guardian air filter element if the old one is dirty.
Service spark plugs: Remove, inspect, and replace spark plugs if worn or fouled. Set correct gap.
Fuel system cleaning: Have a technician clean or rebuild the carburetor/fuel mixer and verify regulator pressure.
Load test: After service, run the generator under typical load and verify stable RPM and voltage.

Medium 3/5

Fuel Mixer / Carburetor

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