Operation Section
-101-
Problem
Probable Cause
Corrective Action
Throttle butterfly valve not opening
or sticking
Foot Pedal signal incorrect or
intermittent
Incorrect air/fuel or ignition control
See Advanced Diagnostics
Will Not
Accelerate/Hesita
tion During
Acceleration or
Engine Stalls
(Gas)
Engine Mechanical
See Engine Service Manual
Isolate the gasoline system by
running the lift truck on LPG
Verify LPG cylinder is full and valve is open.
If the problem does not exist in LPG mode
proceed with the corrective action steps
below.
If the problem also exists in LPG mode then
the root cause is most likely to be
something other than the fuel system
z
See Advanced Diagnostics &
G424E/G430E Dual Fuel Engine
Service Manual
Pressure regulator malfunction
Test pressure regulator operation
z
See G424E/G430E Dual Fuel
Engine Service Manual
Clogged fuel filter
Repair/replace as required
z
See Maintenance section, Primary
and Secondary Fuel Filter
replacement
Pressure regulator malfunction
Test pressure regulator operation
z
See G424E/G430E Dual Fuel
Engine Service Manual
Fuel Injector malfunction
Test Injector operation
z
See G424E/G430E Dual Fuel
Engine Service Manual
Rough Idle (Gas)
Vacuum leak
Check for vacuum leaks
z
Between mixer and throttle body
z
Between throttle body and intake
manifold
z
Between intake manifold and
cylinder head
