Excessive Fuel Consumption - Isuzu A-4JA1 Workshop Manual

TROUBLESHOOTING
Checkpoint
Fuel system
OK
Air cleaner
OK
Idling speed
OK
Injection nozzle
OK
Fuel injection timing
OK
Injection pump
OK
Turbocharger
Continued on the next page
188
4.

EXCESSIVE FUEL CONSUMPTION

Trouble Cause
NG
NG
Clogged air cleaner element
NG
Poorly adjusted idling speed
Injection nozzle injection starting
NG
pressure too low
Improper spray condition
Fuel injection timing improperly
NG
adjusted
Defective delivery valve resulting
NG
is fuel drippage after fuel
injection
NG Air leakage from the turbocharger
intake side
Fuel leakage
Countermeasure
NG Repair or replace the fuel system
related parts
NG Clean or replace the air cleaner
element
NG
Adjust the idling speed
Adjust or replace the injection
NG
nozzle
NG
Adjust the fuel injection timing
NG
Replace the delivery valve
NG Repair the turbocharger intake
side