Mitsubishi 3000GT Service Manual page 81

ENGINE
(9) If there is a cylinder in which the compression pressure
or pressure difference is beyond the limit value, pour
in a small amount of engine oil through the spark plug
mounting hole, and repeat Steps (7) through (8).
1) If the small amount of oil poured in causes the com-
pression pressure to rise, then it is likely that either
the piston ring, cylinder wall surface or both are worn
or damaged.
2) If the small amount of oil poured in does not cause
the compression pressure to rise, then valve seizure,
poor valve contact, or leakage from the gasket is
suspected.
(11) Re-mount the spark plugs and spark plug cables.
or disconnect the negative (-) terminal of the battery,
leave it disconnected for more than 10 seconds, and
then re-connect it.
NOTE
This erases the trouble code due to the disconnection
of the crankshaft position sensor connector.
MANIFOLD VACUUM CHECK
(1) The vehicle should be repaired as follows before the
inspection.
Engine coolant temperature: 80-95°C (176-203°F)
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Lights, electric cooling fan, and accessories: OFF
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Transaxle: Neutral (P for A/T)
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(2) Connect a tachometer. (Refer to P.ll-9.)
(3) 1) <Non-Turbo>
Install a three-way joint to the vacuum hose connected
between the air intake plenum and the fuel pressure
regulator and connect a vacuum gauge to the joint.
2) <Turbo>
Install a three-way joint to the vacuum hose connected
between the air intake plenum and the fuel pressure
solenoid valve and connect a vacuum gauge.
(4) Start the engine and check that idle speed is within the
standard value range.
(5) Check the manifold vacuum.
Limit: 450 mmHg (18 in.Hg)
LASH ADJUSTER CHECK
NOTE
If the clanging noise due to the lash adjuster produced immedi-
ately after the engine has started or during operation persists,
perform the following checks.
(1) Check the engine oil, and add or replace if necessary.
NOTE
(1) If the engine oil level is low, the air drawn in from
the oil strainer will be trapped in the oil passage.