Excessive Fuel Consumption; Engine Noise When Warm - Toyota 3b Repair Manual

ENGINE MECHANICAL
-
Diesel Engine Diagnosis
EM-11
EXCESSIVE FUEL CONSUM PTION
HINT:
Check whether the clutch slips,
brakes grab, whether the tires are the
wrong
size or
the air
filter
is clogged.
(Possible Cause) (Check Procedure and Correction Method)
1.
FUEL LEAKAGE Refer
to item
3 of ROUGH
IDLE
WITH WARM
ENGINE.
After sufficiently warming up engine, check
that
idle
speed
is as
specified below.
(See
page EM-25)
ldle
speed:
M/T
600
-
7OO
rpm
A/T
77O
-
820
rpm
lf
not, adjust
with the
idle adjusting screw.
2.
IDLE SPEED TOO HIGH
Start engine, depress the accelerator pedal to the
floor and check that maximum speed is
as
specified
below.
(See
page EM-25)
Maximum
speed:
B,
38
4,050
-
4,2OO
rpm
118.
148
4,O5O
-
4,250 rpm
lf
not, adjust
with maximum
speed
adjusting screw.
3.
MAXIMUM
SPEED TOO HIGH
REfEr tO
itEM 9
Of
ENGINE
CRANKS NORMALLY BUT
WILL NOT START.
IMPROPER INJECTION
TIMING
Refer
to item 11 of
ENGINE
CRANKS NORMALLY
BUT
WILL
NOT START.
5.
FAULry INJECTION NOZZLE
:
IT
ENGINE NOISE WHEN WARM
(Cranking
Noise
with
Excessive
Vibration)
(Possible Cause)
(Gheck Procedure and Gorrection Method)
l
l
Check
coolant temperature
with water
temp.
gauge.
lf
not sufficiently warm, thermostat is
faulty
and
should be replaced.
1.
COOLANT TEMPERATURE
TOO LOW
Refer
to item 9 of
ENGINE
CRANKS NORMALLY BUT
WILL
NOT
START.
2.
IMPROPER INJECTION
TIMING
Refer
to item 11 of
ENGINE
CRANKS NORMALLY
BUT
WILL
NOT START.
3.
FAULW INJECTION
NOZZLE