Mitsubishi Eclipse 1990 Service Manual page 73

ENGINE
MANIFOLD VACUUM CHECK
1. Before inspection, set vehicles in the following condition:
2. Set up the tachometer or connect the scan tool to the
data link connector.
3. Attach a three-way joint to the vacuum hose connected
between the intake manifold plenum and the fuel pressure
solenoid valve and connect a vacuum gauge.
4. Start the engine, and check that the curb idle speed is
within the standard value range.
Standard value: 750
5. Check the manifold vacuum.
Limit: min. 60
LASH ADJUSTER CHECK
NOTE NOTE
If an abnormal noise (rattling noise) probably caused by the If an abnormal noise (rattling noise) probably caused by the
lash adjusters is heard and the noise does not lash adjusters is heard and the noise does not
as follows. as follows.
1. Check the engine oil, and if required, refuel or replace
it.
NOTE
If the air which has mixed in the oil due to the above
causes enters the high pressure chamber in the lash
adjusters, the air in the high pressure chamber will be
pressurized during opening of the valve, which causes
the lash adjusters to shrink excessively, and an abnormal
noise will be generated when the valve is closed. This
is the same phenomenon as the one when the valve
clearance has been excessively adjusted by mistake.
In this case, if the air which has entered the lash adjusters
is bled, things will be normalized.
TSB Revision
On-vehicle Service
Engine coolant temperature:
Lights, electric cooling fan, and accessories: OFF
Transaxle: Neutral (P range on vehicles with
100
(18
If the amount of the engine oil is insufficient, air will
be sucked in from the oil strainer and mix
passage.
If the amount of the engine oil is more than the speci-
fied amount, it will be stirred by the crankshaft to
make a lot of air in the
If the oil is deteriorated, it will not easily
from air and the amount of air' mixed in the oil will ,
increase.
11100270200
the oil