Isuzu A-4BG1T - Excessive Fuel Consumption

I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I II II I I I I I II II II II II I I I I I I I I I
12-12 TROUBLESHOOTING
EXCESSIVE FUEL CONSUMPTION
Checkpoint
Trouble Cause
Remedy
fuel system
NG
Fuel leakage
NG
Repair or replace the fuel system
related parts
OK
I
t
Air cleaner
NG
Clogged air cleaner element
NG Clean or replace the air cleaner
element
OK
r
low idling speed
NG
Poorly adjusted low idle speed
NG
r -
- Adjust the low idle speed
i
I
t
b
J
OK t
_ -
-- -
f
Injection nozzle
NG
Injection nozzle injection’ starting
pressure too low
Improper spray condition
NG
Adjust or replace the injection
nozzle
l
.
I
I
. ..-
h
OK
f ue1 injection timing
I
OK 1
t
1
t
1
NG
Fuel injection timing improperly
NG
adjusted
Adjust the fuel injection timing
hjection pump
NG
Defective delivery valve result-
ing fuel drippage after fuel
NG
-
Replace the delivery valve
injection
1
I
b
OK 1
i
I
I
:
r
Turbocharger
NG
Air leakage from the turbocharger
NG Repair the turbocharger intake
intake side
side
L
I
Continued on the next page