Compression Pressure Check (Dohc) - Mitsubishi 1989-1993 GALANT Service Manual

<DOHC>
ENGINE
switch
(12) When there is no continuity, lower the engine speed when
COMPRESSION PRESSURE CHECK
(1) Before inspection, verify that the engine oil, starter motor
(2) Disconnect the spark plug cable.
(3) Remove all the spark plugs.
(4) Disconnect the connector of the crankshaft position sensor.
(5) Cover the spark plug holes with a cloth, etc., and crank the
(6) Set up the compression gauge in the spark plug mounting
(7) Fully open the throttle valve, and cranking the engine.
(8) Measure the compression pressure of each cylinder. and
position switch terminal and body.
NOTE
When there is continuity, a clearance will be created
between the throttle lever and dash pot rod when the dash
pot rod is pressed lightly.
the dash pot begins operation to within the standard value
tolerance. Make sure to create continuity between the
closed throttle position switch terminal and body.
and battery are normal. Then, perform the following.
l Engine coolant temperature: 80- 95°C (1 76- 205'F)
l
NOTE
This will prevent the engine control module from controll-
ing the ignition and fuel injection.
engine. Then verify that no foreign material sticks to the
cloth, etc.
Caution
1. During cranking, be especially careful of the spark plug
installing hole.
2. Very hot water, oil, fuel, etc., which may have entered
the cylinder somehow, will violently spout through the
spark plug hole if the compression is measured in the
entrapped state. This is vex/ dangerous.
hole.
measure the compression pressure.
Standard value:
<Non-Turbo>
Up to 1991: 1,350 kPa (192 psi) [250- 400 rpml
From 1992: 1,550 kPa (220 psi) [250-400
1 ,150 kPa (164 psi) [250- 400 rpml
<Turbo>
Limit:
<Non-Turbo>
960 kPa (137 psi) [250- 400
up to 1991:
From 1992: 1 ,120 kPa (159 psi) [250- 400 rpml
800 kPa (114 psi) [250- 400 rpml
verify that the pressure difference among the cylinders is
less than the limit value.
Limit: max. 100 kPa (14 psi)