Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 535

6 – 14 TROUBLESHOOTING

Checkpoint

Trouble

Cause

Countermeasure

Valve clearance

Valve clearance improperly

adjusted

Adjust the valve clearance

Valve spring weak or broken

Replace the valve spring

Exhaust pipe clogged

Clean the exhaust pipe

Open and improperly set

adjusting screw seal

Adjust and reseal the adjusting

screw

NG

NG

NG

NG

Continued from the previous page

Exhaust system

OK

Full load adjusting screw seal

OK

Valve spring

OK

OK

TROUBLESHOOTING 6 – 15

1504

EXCESSIVE FUEL CONSUMPTION

Checkpoint

Trouble

Cause

Countermeasure

Fuel system

Fuel leakage

Repair or replace the fuel

system related parts

Clogged air cleaner element

Clean or replace the air cleaner

element

Air cleaner

Poorly adjusted idling speed

Adjust the idling speed

Idling speed

Injection nozzle injection

starting pressure too low

Improper spray condition

Adjust or replace the injection

nozzle

Injection nozzle

Fuel injection timing improperly

adjusted

Adjust the fuel injection timing

Defective delivery valve

resulting in fuel drippage after

fuel injection

Replace the delivery valve

Turbocharger

Air leakage from the

turbocharger intake side

Repair the turbocharger intake

side

OK

OK

OK

OK

NG

NG

NG

NG

NG

NG

NG

Continued on the next page

Fuel injection timing

OK

Injection pump

OK

6 – 16 TROUBLESHOOTING

Checkpoint

Trouble

Cause

Countermeasure

Turbocharger

Defective turbocharger

assembly

Replace the turbocharger

assembly

Valve clearance improperly

adjusted

Adjust the valve clearance

Blown out cylinder head gasket

Worn cylinder liner

Piston ring sticking or broken

Improper seating between the

valve and the valve seat

Replace the related parts

Valve spring weak or broken

Replace the valve spring

NG

NG

NG

NG

Continued from the previous page

Compression pressure

OK

Valve spring

OK

Valve clearance

OK

TROUBLESHOOTING 6 – 17

1505

EXCESSIVE OIL CONSUMPTION

Checkpoint

Trouble

Cause

Countermeasure

Engine oil

Engine oil unsuitable

Too much engine oil

Replace the engine oil

Correct the engine oil volume

Oil leakage from the oil seal

and/or the gasket

Replace the oil seal and/or the

gasket

Oil seal and gasket

Clogged air breather

Clean the air breather

Air breather

Worn valve stems and valve

guides

Replace the intake and exhaust

valves and the valve guides

Intake and exhaust valves

OK

OK

OK

NG

NG

NG

NG