Operation Section
-101-
Problem Probable Cause Corrective Action
Will Not
Accelerate/Hesita
tion During
Acceleration or
Engine Stalls
(Gas)
Throttle butterfly valve not opening
or sticking
See Advanced Diagnostics
Foot Pedal signal incorrect or
intermittent
Incorrect air/fuel or ignition control
Engine Mechanical See Engine Service Manual
Rough Idle (Gas)
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 & Service
Manual
Pressure regulator malfunction Test pressure regulator operation
z See Engine Service Manual
Clogged fuel filte
Repair/replace as required
z See Maintenance section, Primary and
Secondary Fuel Filter replacement
Pressure regulator malfunction Test pressure regulator operation
z See Engine Service Manual
Fuel Injector malfunction Test Injector operation
z See Engine Service Manual
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