
-90-
-90-
Operation Section
Operation Section
Problem
Problem
Probable
Probable Cause
Cause
Corrective
Corrective Action
Action
Incorrect Idle speed control
Incorrect Idle speed control
Incorrect timing or spark control
Incorrect timing or spark control
See Advanced Diagnostics & See Engine
See Advanced Diagnostics & See Engine
Service Manual
Service Manual
Rough Idle
Rough Idle
Engine
Engine Mechanical
Mechanical
See
See Engine
Engine Service
Service Manual
Manual
Incorrect Idle speed control
Incorrect Idle speed control
Throttle sticking
Throttle sticking
See Advanced Diagnostics & See Engine
See Advanced Diagnostics & See Engine
Service Manual
Service Manual
High Idle Speed
High Idle Speed
Foot pedal sticking or incorrect
Foot pedal sticking or incorrect
pedal signal
pedal signal
Check pedal return spring travel for
Check pedal return spring travel for binding
binding
See Advanced Diagnostics
See Advanced Diagnostics
Clogged
Clogged fuel
fuel filter
filter
Repair/replace
Repair/replace as
as required
required
See Maintenance section, Fuel Filter
See Maintenance section, Fuel Filter
replacement
replacement
Plugged
Plugged fuel
fuel line
line
Remove
Remove obstruction
obstruction from
from the
the fuel
fuel line
line
Close liquid fuel valve
Close liquid fuel valve
Using caution, disconnect the fuel line
Using caution, disconnect the fuel line
(some propane may escape)
(some propane may escape)
Clear obstruction with compressed air
Clear obstruction with compressed air
Re-connect fuel line
Re-connect fuel line
Slowly open liquid fuel valve & Leak
Slowly open liquid fuel valve & Leak
test
test
Air
Air filter
filter clogged
clogged
Check
Check air
air filter
filter
Clean/replace as required
Clean/replace as required
Faulty vapor connection between
Faulty vapor connection between
the pressure regulator/converter
the pressure regulator/converter
and the mixer
and the mixer
Check connection
Check connection
Verify no holes in hose
Verify no holes in hose
Clamps must be tight
Clamps must be tight
Look for kinked, pinched and/or
Look for kinked, pinched and/or
collapsed hose
collapsed hose
Pressure
Pressure regulator
regulator malfunction
malfunction
Test
Test pressure
pressure regulator
regulator operation
operation
See Engine Service Manual
See Engine Service Manual
Air/Fuel
Air/Fuel Mixer
Mixer malfunction
malfunction
Check
Check mixer
mixer
See Engine Service Manual
See Engine Service Manual
Restricted
Restricted exhaust
exhaust system
system
Check
Check exhaust
exhaust system
system
Measure exhaust back pressure
Measure exhaust back pressure
Incorrect ignition control
Incorrect ignition control
Incorrect air/fuel control
Incorrect air/fuel control
Poor High Speed
Poor High Speed
Performance
Performance
Incorrect throttle position
Incorrect throttle position
See Advanced Diagnostics & See Engine
See Advanced Diagnostics & See Engine
Service Manual
Service Manual
Summary of Contents for G20E-5
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