Operation Section
-81-
Problem Probable Cause Corrective Action
Air/Fuel Mixer malfunction Check mixer
z See Engine Service Manual
Air filter clogged Check air filter
z Clean/replace as required
Vacuum leak Check system vacuum hoses from regulator to
FTV and mixer
z Repair/replace as necessary
Pressure regulator malfunction/fuel
pressure too high
Test pressure regulator operation
z See Engine Service Manual
Faulty FTV
(G643E only)
Check FTV for housing cracks or obstructions
z See Advanced Diagnostics FTV operation
z Repair and/or replace as necessary
Weak ignition and/or spark control See Advanced Diagnostics
Incorrect air/fuel control See Advanced Diagnostics
Exhaust system leaks Repair exhaust system
Excessive Fuel
Consumption/LPG
Exhaust Smell
Oxygen sensor failure Replace as necessary
z See Advanced Diagnostics
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