Isuzu Rodeo UE. Manual — part 275
6A–13
ENGINE MECHANICAL (6VD1 3.2L)
Troubleshooting Procedure
The slapping sound stops when spark plug on bad cylin-
der is shorted out.
Condition
Possible cause
Correction
Timing belt noise
Timing belt tension is incorrect
Replace pusher or adjust the tension
pulley or replace timing belt
Tensioner bearing defective
Replace
Timing belt defective
Replace
Timing pulley defective
Replace
Timing belt comes in contact with
timing cover
Replace timing belt and timing cover
Valve noise
Valve clearance incorrect
Replace adjusting shim
Valve and valve guide seized
Replace valve and valve guide
Valve spring broken or weakened
Replace
Valve seat off–positioned
Correct
Camshaft worn out
Replace
Crankshaft noise
Crankshaft end play excessive
(noise occurs when clutch is
engaged)
Replace thrust bearing
Engine knocking
Preignition due to use of spark plugs
of inadequate heat range
Install Spark Plugs of adequate heat
range
Carbon deposits in combustion
chambers
Clean
Fuel too low in octane rating
Replace fuel
Wide Open Throttle enrichment
system failure
Refer to Section 6E
Selection of transmission gear
incorrect
Caution operator of incorrect gear
selection
Engine overheating
Refer to “Engine Lacks Power”
Others
Water pump defective
Replace
Drive belt slipping
Replace auto tentioner or drive belt
6A–14
ENGINE MECHANICAL (6VD1 3.2L)
Abnormal Combustion
Condition
Possible cause
Correction
Trouble in fuel system
Fuel pressure control valve defective
Replace
Fuel filter clogged
Replace
Fuel pump clogged
Clean or replace
Fuel tank or fuel pipe clogged
Clean or replace
Fuel injector clogged
Clean or replace
Fuel pump relay defective
Replace
Power supply cable for fuel pump
broken or poor connections
Reconnect, correct or replace
Mass Airflow (MAF) Sensor circuit
open or defective
Correct or replace
MAF Sensor defective
Replace
Manifold Absolute Pressure Sensor
circuit open or shorted
Correct or replace
Manifold Absolute Pressure Sensor
defective
Replace
Engine Coolant Temperature (ECT)
Sensor circuit open or shorted
Correct or replace
ECT Sensor defective
Replace
Throttle Position Sensor adjustment
incorrect
Readjust
Throttle Position Sensor defective
Replace
Throttle Position Sensor connector
poor connections
Reconnect
Vehicle Speed Sensor cable poor
connections or defective
Correct or replace
Vehicle Speed Sensor loosely fixed
Fix tightly
Vehicle Speed Sensor in wrong
contact or defective
Replace
Powertrain Control Module cable
poor connections or defective
Correct or replace
Trouble in emission control system
Heated Oxygen Sensor circuit open
Correct or replace
Heated Oxygen Sensor defective
Replace
Signal vacuum hose loosely fitted or
defective
Correct or replace
EGR Valve circuit open or shorted
Correct or replace
Exhaust Gas Recirculation Valve
defective
Replace
ECT Sensor circuit open or shorted
Correct or replace
Canister Purge Valve circuit open or
shorted
Correct or replace
Canister Purge Valve defective
Replace
ECT Sensor defective
Replace
Positive Crankcase Ventilation
(PCV) valve and hose clogged
Correct or replace
Evaporator system
Refer to Section 6E
Trouble in ignition system
————
Refer to “Engine Lacks Power”
6A–15
ENGINE MECHANICAL (6VD1 3.2L)
Condition
Correction
Possible cause
Trouble in cylinder head parts
Carbon deposits in combustion
chamber
Remove carbon
Carbon deposit on valve, valve seat
and valve guide
Remove carbon
6A–16
ENGINE MECHANICAL (6VD1 3.2L)
Engine Oil Consumption Excessive
Condition
Possible cause
Correction
Oil leaking
Oil pan drain plug loose
Retighten or replace gasket
Crankcase fixing bolts loosened
Retighten
Oil pan setting bolts loosened
Retighten
Oil pan gasket broken
Replace gasket
Front cover retaining bolts loose or
gasket broken
Retighten or replace gasket
Head cover fixing bolts loose or
gasket broken
Retighten or replace gasket
Oil cooler adapter cracked
Replace
Oil cooler center bolt loose
Retighten
Oil cooler O–ring broken
Replace
Oil cooler piping loose or broken
Retighten or replace
Oil filter adapter cracked
Replace
Oil filter attachings bolt loose or
rubber gasket broken
Retighten or replace oil filter
Oil cooler broken
Replace
Crankshaft front or rear oil seal
defective
Replace oil seal
Oil pressure unit loose or broken
Retighten or replace
Blow–by gas hose broken
Replace hose
Positive Crankcase Ventilation Valve
clogged
Clean
Engine/Transmission coupling failed
Replace oil seal
Oil leaking into combustion
chambers due to poor seal in valve
Valve stem oil seal defective
Replace
chambers due to oor seal in valve
system
Valve stem or valve guide worn
Replace valve and valve guide
Oil leaking into combustion
chambers due to poor seal in cylinder
t
Cylinders and pistons worn
excessively
Replace cylinder body assembly and
pistons
parts
Piston ring gaps incorrectly
positioned
Correct
Piston rings set with wrong side up
Correct
Piston ring sticking
Replace cylinder body assembly and
pistons
Piston ring and ring groove worn
Replace pistons and others
Return ports in oil rings clogged
Clean piston and replace rings
Positive Crankcase Ventilation
System malfunctioning
Positive Crankcase Ventilation Valve
clogged
Clean
Others
Improper oil viscosity
Use oil of recommended S.A.E.
viscosity
Continuous high speed driving
and/or severe usage such as trailer
towing
Continuous high speed operation
and/or severe usage will normally
cause increased oil consumption
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