Maintenance Section
-177-
Inspect Vacuum Lines and
Fittings (G424E/G430 Engine
Only)
1.
Visually inspect vacuum lines and fittings for
physical damage such as bittleness, cracks and
kinks. Repair/replace as required.
2.
Slovent or oil damage may cause vacuum lines
to become soft resulting in a collapsed line
while the engine is running.
3.
If abnormally soft lines are detected, replace as
necessary.
(1) Fuel Trim Valve(FTV)
(2) Vacuum lines
Fuel Trim Valve(FTV) Inspection
(G424E/G430E Engine Only)
1.
Visually inspect the Fuel trim valve for
abrasions or cracking. Replace as necessary.
2.
To ensure the valve is not leaking a blow-by
test can be performed.
3.
With the engine off, disconnect the electrical
connector to the FTV.
4.
Disconnect the vacuum lines form the FTV to
the pressure regulator/converter, at the
converter’s tee connection.
5.
Lightly blow through the vacuum line connected
to the FTV. Air should not pass through the FTV
when de-energized. If air leaks past the FTV
when de-energized replace replace the FTV.
Inspect Electrical System
(G424E/G430E Engine Only)
1.
Check for loose, dirty or damaged connectors
and wires on the harness including: Fuel
lock-off, TMAP sensor, O2 sensor, Electronic
throttle, Control Relays, Fuel Trim Valve, Foot
Pedal, and Distributor sensor.
2.
Repair and/or replace as necessary.
Inspect VR Sensor – Clean
(G424E engine only)
1.
Steer the tires fully so that VR sensor around
engine crankshaft pulley can be seen.
2.
Stop engine and disconnect battry cables.
3.
Inspect VR sensor and tooth wheel. If they are
soiled, clean them with air.
(1) VR sensor
(2) Tooth Wheel
2
1
2
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