Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 783
6A–12
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–13
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
Engine 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
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”
Trouble in cylinder head parts
Carbon deposits in combustion
chamber
Remove carbon
Carbon deposit on valve, valve seat
and valve guide
Remove carbon
6A–14
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
6A–15
ENGINE MECHANICAL (6VD1 3.2L)
Fuel Consumption Excessive
Condition
Possible cause
Correction
Trouble in fuel system
Mixture too rich or too lean due to
trouble in fuel injection system
Refer to “Abnormal Combustion”
Fuel cut function does not work
Refer to “Abnormal Combustion”
Trouble in ignition system
Misfiring or abnormal combustion
due to trouble in ignition system
Refer to “Hard Start” or “Abnormal
Combustion”
Others
Engine idle speed too high
Reset Idle Air Control Valve
Returning of accelerator control
sluggish
Correct
Fuel system leakage
Correct or replace
Clutch slipping
Correct
Brake drag
Correct
Selection of transmission gear
incorrect
Caution operator of incorrect gear
selection
Lubrication Problems
Condition
Possible cause
Correction
Oil pressure too low
Wrong oil in use
Replace with correct engine oil
Relief valve sticking
Replace
Oil pump not operating properly
Correct or replace
Oil pump strainer clogged
Clean or replace strainer
Oil pump worn
Replace
Oil pressure gauge defective
Correct or replace
Crankshaft bearing or connecting
rod bearing worn
Replace
Oil contamination
Wrong oil in use
Replace with correct engine oil
Oil filter clogged
Replace oil filter
Cylinder head gasket damage
Replace gasket
Burned gases leaking
Replace piston and piston rings or
cylinder body assembly
Oil not reaching valve system
Oil passage in cylinder head or
cylinder body clogged
Clean or correct
Engine Oil Pressure Check
1. Check for dirt, gasoline or water in the engine oil.
a. Check the viscosity of the oil.
b. Check the viscosity of the oil.
c. Change the oil if the viscosity is outside the
specified standard.
d. Refer to the “Maintenance and Lubrication” section
of this manual.
2. Check the engine oil level.
The level should fall somewhere between the “ADD”
and the “FULL” marks on the oil level dipstick.
If the oil level does not reach the “ADD” mark on the
oil level dipstick, engine oil must be added.
3. Remove the oil pressure unit.
4. Install an oil pressure gauge.
5. Start the engine and allow the engine to reach normal
operating temperature (About 80
°
C).
6. Measure the oil pressure.
Oil pressure should be:
392–550 kPa (56.9–80.4 psi) at 3000 rpm.
7. Stop the engine.
8. Remove the oil pressure gauge.
9. Install the oil pressure unit.
10. Start the engine and check for leaks.
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст