Operation Section
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Problem Probable Cause Corrective Action
Incorrect Idle speed control
Incorrect timing or spark control
See Advanced Diagnostics & See G643E
Engine Service Manual
Rough Idle
Engine Mechanical See Engine Service Manual
Incorrect Idle speed control
Throttle sticking
See Advanced Diagnostics & See G643E
Engine Service Manual
High Idle Speed
Foot pedal sticking or incorrect
pedal signal
Check pedal return spring travel for binding
z See Advanced Diagnostics
Clogged fuel filter Repair/replace as required
z See Maintenance section, Fuel Filter
replacement
Plugged fuel line Remove obstruction from the fuel line
z Close liquid fuel valve
z Using caution, disconnect the fuel line
(some propane may escape)
z Clear obstruction with compressed air
z Re-connect fuel line
z Slowly open liquid fuel valve & Leak
test
Air filter clogged Check air filter
z Clean/replace as required
Faulty vapor connection between
the pressure regulator/converter and
the mixer
Check connection
z Verify no holes in hose
z Clamps must be tight
z Look for kinked, pinched and/or
collapsed hose
Pressure regulator malfunction Test pressure regulator operation
z See G643E Engine Service Manual
Air/Fuel Mixer malfunction Check mixer
z See G643E Engine Service Manual
Restricted exhaust system Check exhaust system
z Measure exhaust back pressure
Incorrect ignition control
Incorrect air/fuel control
Poor High Speed
Performance
Incorrect throttle position
See Advanced Diagnostics & See G643E
Engine Service Manual
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