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Maintenance Section
Maintenance Section
Inspect Vacuum Lines and
Inspect Vacuum Lines and Fittin
Fittings
gs
(G420F(E)/G
(G420F(E)/G424F(E) Engine
424F(E) Engine Only)
Only)
1.
1.
Visually inspect vacuum lines and fittings for
Visually inspect vacuum lines and fittings for
physical damage such as bittleness, cracks and
physical damage such as bittleness, cracks and
kinks. Repair/replace as required.
kinks. Repair/replace as required.
2.
2.
Slovent or oil damage may cause vacuum lines
Slovent or oil damage may cause vacuum lines
to become soft resulting in a collapsed line
to become soft resulting in a collapsed line
while the engine is running.
while the engine is running.
3.
3.
If abnormally soft lines are detected, replace as
If abnormally soft lines are detected, replace as
necessary.
necessary.
(1) Fuel Trim Valve(FTV)
(1) Fuel Trim Valve(FTV)
(2) Vacuum lines
(2) Vacuum lines
Fuel Trim Valve(FTV) Inspection
Fuel Trim Valve(FTV) Inspection
(G420F(E)/G
(G420F(E)/G424F(E) Engine
424F(E) Engine Only)
Only)
1.
1.
Visually inspect the Fuel trim valve for
Visually inspect the Fuel trim valve for
abrasions or cracking. Replace as necessary.
abrasions or cracking. Replace as necessary.
2.
2.
To ensure the valve is not leaking a blow-by
To ensure the valve is not leaking a blow-by
test can be performed.
test can be performed.
3.
3.
With the engine off, disconnect the electrical
With the engine off, disconnect the electrical
connector to the FTV.
connector to the FTV.
4.
4.
Disconnect the vacuum lines form the FTV to
Disconnect the vacuum lines form the FTV to
the pressure regulator/converter, at the
the pressure regulator/converter, at the
converter’s tee connection.
converter’s tee connection.
5.
5.
Lightly blow through the
Lightly blow through the vacuum line connected
vacuum line connected
to the FTV. Air should no
to the FTV. Air should not pass through the FTV
t pass through the FTV
when de-energized. If air leaks past the FTV
when de-energized. If air leaks past the FTV
when de-energized replace replace the
when de-energized replace replace the FTV.
FTV.
Inspect Electrical System
Inspect Electrical System
(G420F(E)/G
(G420F(E)/G424F(E) Engine
424F(E) Engine Only)
Only)
1.
1.
Check for loose, dirty or damaged connectors
Check for loose, dirty or damaged connectors
and wires on the harness including: Fuel
and wires on the harness including: Fuel
lock-off, TMAP sensor, O2 sensor, Electronic
lock-off, TMAP sensor, O2 sensor, Electronic
throttle, Control Relays, Fuel Trim Valve, Foot
throttle, Control Relays, Fuel Trim Valve, Foot
Pedal, and crank
Pedal, and crank sensor.
sensor.
2.
2.
Repair and/or replace as necessary.
Repair and/or replace as necessary.
2
2
1
1
Summary of Contents for G20E-5
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