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The HEGO is sensitive to silicone based
products and can become contaminated.
Avoid using silicone sealers/lubricants on
any fuel or exhaust related components.
10. Reconnect negative battery cable.
11. Turn key to ON.
12. Check for leaks. If leaks are detected, make
repairs.
XXV. LPG FUEL SYSTEM LEAK TEST
1. Use a commercially available liquid leak detec-
tor or an electronic leak detector and follow the
manufacturer’s instructions.
IMPORTANT
When using both methods, use the electronic leak
detector first to avoid contamination by the liquid
leak detector.
XXVI. RESTRICTED EXHAUST SYSTEM
DIAGNOSIS
PROCEDURE:
1. Stop Engine. Carefully remove the HEGO.
2. Install Exhaust Back Pressure Test Gauge
(J35314-A) in place of the HEGO.
3. With the engine idling at normal operating
temperature, observe the exhaust system
back pressure reading on the gauge. Reading
should not exceed 8.6 kPa (1.25 psi).
4. Increase engine speed to 2000 RPM and ob-
serve gauge. Reading should not exceed
20.7 kPa (3 psi).
5. If the back pressure at either speed exceeds
specification, a restricted exhaust system is
indicated.
6. Inspect the entire exhaust system for a col-
lapsed pipe, heat distress or possible internal
catalytic converter failure.
7. If there are no obvious reasons for the exces-
sive back pressure, the catalytic converter is
likely damaged and should be replaced.
8. Check for MIL. If a DTC code is found, refer
to the Electrical Section for further diagnosis.
1. Back Pressure Gauge
2. Heated Exhaust Gas Oxygen Sensor
(HEGO 1--Sensor between the engine and
catalytic converter).
3. Exhaust Pipe/Muffler
Exhaust Back Pressure Test
XXVII. CATALYTIC CONVERTER
REMOVAL PROCEDURE
1. Remove the Catalytic Converter using the
OEM end product processes
INSTALLATION PROCEDURE
IMPORTANT
The Catalytic Converter is specifically designed to
meet the emission control of the certified engine.
Use only the OEM specified part. Install the Cata-
lytic Converter using the OEM end product
processes.
1. Start engine
2. Check for any DTC codes and clear
3. Verify engine is in closed loop and no MIL
lights are present.
4. If a DTC code is found, refer to the Electrical
Section for further diagnosis.
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