Jeep Liberty KJ. Manual — part 936
MUFFLER
REMOVAL
1. Raise vehicle on hoist.
2. Remove exhaust pipe to muffler and tailpipe assembly retaining nuts (2).
3. Using a suitable pry bar, pry muffler and tailpipe assembly out of exhaust hanger.
4. Remove muffler and tailpipe assembly (3) from vehicle.
INSTALLATION
1. Install muffler and tailpipe assembly in vehicle and attach to exhaust hangers.
2. Install muffler and tailpipe assembly to exhaust pipe retaining nuts. Torque nuts to 32 N·m.
3. Lower vehicle from hoist.
11 - 10
EXHAUST SYSTEM
KJ
HEAT SHIELDS
DESCRIPTION
Heat shields (1) (3) are needed to protect both the
vehicle and the environment from the high tempera-
tures developed by the catalytic converter. The cata-
lytic
converter
releases
additional
heat
into
the
exhaust system. Under severe operating conditions,
the temperature increases in the area of the converter.
Such conditions can exist when the engine misfires or
otherwise does not operate at peak efficiency.
KJ
EXHAUST SYSTEM
11 - 11
TURBOCHARGER SYSTEM
DIAGNOSIS AND TESTING
TURBOCHARGER BOOST PRESSURE
Low turbocharger boost pressure can cause poor engine performance and driveability concerns. The following pro-
cedure will test the turbocharger boost pressure.
Causes of low boost pressure include the following:
•
Restricted air inlet system
•
Leak in charge air cooler system
•
Restricted/high pressure drop across charge air cooler
•
Damaged turbocharger compressor wheel housing
•
Turbocharger wastegate stuck open
•
Excessive exhaust restriction
Causes of excessively high boost pressure include:
•
Turbocharger wastegate stuck closed
•
Turbocharger wastegate signal line leaking or damaged
•
Damaged wastegate command valve O-rings
•
Wastegate command valve mechanically stuck in actuated position
Several Diagnostic Trouble Codes (DTCs) can be set that will indicate high or low system boost levels. There is a
DTC for circuit faults relating to the electronically controlled wastegate command valve.
(Refer to 11 - EXHAUST SYSTEM/TURBOCHARGER SYSTEM/CHARGE AIR COOLER AND PLUMBING - DIAG-
NOSIS AND TESTING) for diagnosing of low or high boost pressure due to leaks.
11 - 12
EXHAUST SYSTEM
KJ
CHARGE AIR COOLER AND PLUMBING
DIAGNOSIS AND TESTING
CHARGE AIR COOLER SYSTEM - LEAKS
Low turbocharger boost pressure and low engine per-
formance can be caused by leaks in the charge air
cooler or plumbing. Fuel staining on the exhaust man-
ifold can also be an indication that there are leaks in
the air system. The following procedure outlines how
to check for leaks in the charge air cooler system.
This procedure can also be used to check for leaks in
the wastegate signal line or the wastegate canister.
1. Loosen clamp (1) and remove air inlet hose (3)
from turbocharger.
2. Insert Special Tool 9022 Adapter into the turbo-
charger inlet. Tighten tool clamp to 8 N·m (72 in.
lbs.).
CAUTION: Do not apply more than 138 kPa (20
psi) air pressure to the charge air cooler system;
severe damage to the charge air cooler system
may occur.
3. Connect a regulated air supply to air fitting on Tool
9022 Adapter. Set air pressure to a maximum of
138 kPa (20 psi).
4. Using soapy water check the rubber sleeves, charge air cooler and intake manifold for leaks.
5. Using soapy water check for leaks at the wastegate signal line, wastegate canister and wastegate command
valve.
KJ
EXHAUST SYSTEM
11 - 13
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