Condition |
Possible Sources |
Action |
|
- Damaged ignition
system.
- Damaged fuel
system.
- Damaged starting
system.
- Damaged charging
system/battery.
- Burnt valve.
- Worn piston.
- Worn piston rings.
- Damaged head
gasket
- Damaged cooling
system.
|
- Refer to the appropriate section
in Group 303 for the procedure.
REFER to the Powertrain
Control/Emissions Diagnosis
(PC/ED) manual.
- Refer to the appropriate section
in Group 303 for the procedure.
REFER to the Powertrain
Control/Emissions Diagnosis
(PC/ED) manual
- Refer to the appropriate section
in Group 303 for the procedure. REFER to the Powertrain
Control/Emissions Diagnosis
(PC/ED) manual
- INSTALL a new valve.
- INSTALL a new piston.
- INSTALL new piston rings.
- REPAIR or INSTALL a new
cylinder block
- INSTALL a new head gasket.
- Refer to the appropriate section
in Group 303 for the procedure.
REFER to the Powertrain
Control/Emissions Diagnosis
(PC/ED) manual.
|
|
- Vacuum leaks.
- Malfunctioning or
damaged ignition
system.
- Malfunctioning or
damaged fuel
system.
- Damaged valve
tappet or lash
adjuster.
- Damaged valve
tappet guide or lash
adjuster.
- Incorrect valve-tovalve
seat contact
- Damaged head
gasket
|
- Refer to the appropriate section
in Group 303 for the procedure.
REFER to the Powertrain
Control/Emissions Diagnosis
(PC/ED) manual.
- Refer to the appropriate section
in Group 303 for the procedure.
REFER to the Powertrain
Control/Emissions Diagnosis
(PC/ED) manual.
- Refer to the appropriate section
in Group 303 for the procedure.
REFER to the Powertrain
Control/Emissions Diagnosis
(PC/ED) manual
- INSTALL a new valve tappet or
lash adjuster
- INSTALL a new valve tappet
guide or valve tappet
- REPAIR or INSTALL a new
valve or valve seat.
- INSTALL a new head gasket.
|
|
- Malfunctioning or
damaged fuel
system.
- Malfunctioning or
damaged ignition
system.
- Malfunctioning or
damaged air intake
system.
- Damaged valve
tappet or lash
adjuster.
- Damaged valve
tappet guide or
valve tappet.
- Burnt or sticking
valve.
- Weak or broken
valve spring.
- Carbon
accumulation in
combustion
chamber
|
- Refer to the appropriate section
in Group 303 for the procedure.
REFER to the Powertrain
Control/Emissions Diagnosis
(PC/ED) manual.
- Refer to the appropriate section
in Group 303 for the procedure.
REFER to the Powertrain
Control/Emissions Diagnosis
(PC/ED) manual.
- Refer to the appropriate section
in Group 303 for the procedure.
REFER to the Powertrain
Control/Emissions Diagnosis (PC/ED) manual.
- INSTALL a new valve tappet or
lash adjuster.
- INSTALL a new valve tappet
guide or valve tappet.
- REPAIR or INSTALL a new
valve.
- INSTALL a new valve spring.
- ELIMINATE carbon buildup.
|
- Excessive oil
consumption
|
- Leaking oil.
- Malfunctioning PCV
system
- Worn valve stem
seal.
- Worn valve stem or
valve guide.
- Sticking piston
rings.
- Worn piston ring
groove.
- Worn piston or
cylinder
|
- REPAIR oil leakage.
- REPAIR or INSTALL new
necessary components
- INSTALL a new valve stem seal.
- INSTALL a new valve and valve
guide.
- REPAIR or INSTALL new piston
rings.
- INSTALL a new piston and
piston pin
- REPAIR or INSTALL a new
piston or cylinder block
|
|
- Leaking exhaust
system
- Incorrect drive belt
tension.
- Malfunctioning
generator bearing
- Malfunctioning
water pump
bearing.
- Malfunctioning or
damaged cooling
system.
- Malfunctioning or
damaged fuel
system.
- Loose timing
chain/belt (6268).
- Damaged timing
chain tensioner
(6L266).
- Excessive main
bearing clearance.
- Seized or heat
damaged
crankshaft main
bearing.
- Excessive
crankshaft end
play.
- Excessive
connecting rod
bearing clearance.
- Heat damaged
connecting rod
bearing (6211).
- Damaged
connecting rod
bushing (6207).
- Worn cylinder.
- Worn piston (6108)
or piston pin
(6135).
- Damaged piston
rings.
- Bent connecting
rod.
- Malfunctioning
valve tappet (6500)
or lash adjuster.
- Excessive valve
tappet or lash
adjuster clearance.
- Broken valve spring
(6513).
- Excessive valve
guide clearance.
|
|
|
- Malfunctioning or
damaged ignition
system.
- Malfunctioning or
damaged fuel
system.
- Malfunctioning or
damaged air intake
system.
- Damaged or
plugged exhaust
system.
- Incorrect tire size.
- Dragging brakes.
- Slipping
transmission.
- Malfunctioning
valve tappet or lash
adjuster.
- Damaged valve
tappet guide or
valve tappet.
- Compression
leakage at valve
seat.
- Seized valve stem.
- Weak or broken
valve spring
- Worn or damaged
camshaft.
- Damaged head
gasket (6051).
- Cracked or
distorted cylinder
head
- Damaged, worn or
sticking piston ring
(s).
- Worn or damaged
piston.
|
- Refer to the appropriate section
in Group 303 for the procedure.
REFER to the Powertrain
Control/Emissions Diagnosis
(PC/ED) manual
- Refer to the appropriate section
in Group 303 for the procedure.
REFER to the Powertrain
Control/Emissions Diagnosis
(PC/ED) manual.
- Refer to the appropriate section
in Group 303 for the procedure.
REFER to the Powertrain
Control/Emissions Diagnosis
(PC/ED) manual.
- INSPECT exhaust system.
- Refer to the appropriate section
in Group 307 for the procedure.
- INSTALL a new valve tappet or
lash adjuster
- INSTALL a new valve tappet
guide or valve tappet.
- REPAIR or INSTALL a new
valve, valve seat or cylinder
head (6049).
- INSTALL a new valve.
- INSTALL a new valve spring.
- INSTALL a new camshaft.
- INSTALL a new head gasket.
- INSTALL a new cylinder head.
- REPAIR or INSTALL a new
piston ring(s).
- INSTALL a new piston and
piston pin.
|
1. Verify the customer concern by operating the engine to duplicate the
condition.
2. Visually inspect for obvious signs of mechanical damage. Refer to the
following chart.
Visual Inspection Ch ...
Engine Oil Leaks
NOTE: When diagnosing engine oil leaks, the source and location of
the leak must be positively
identified prior to repair.
Prior to carrying out this procedure, clean all sealin ...
Other materials:
Transmission Fluid Cooler
CAUTION: Whenever a transmission has been disassembled to install
new parts, the
cooler bypass valve (CBV), all transmission fluid coolers (in tank and
auxiliary) and
transmission fluid cooler lines must be cleaned and backflushed. Use a
suitable the t ...
Removal
1. Disconnect the battery negative cable.
2. Drain the engine cooling system.
3. Remove the RH exhaust manifold. For additional information, refer to Exhaust
Manifold RH in
this section.
4. Remove the lower intake manifold. For additional information, re ...
Fittings - Vapor Tube
Disconnect
1. WARNING: The evaporative emission system contains fuel vapor and
condensed
fuel vapor. Although not present in large quantities, it still presents the
danger of
explosion or fire. Disconnect the battery ground cable from the battery to
minimiz ...