Mitsubishi 4G1 Service Manual page 323

DISASSEMBLY SERVICE POINTS
PEDAL POSITION SENSOR AND IDLE AIR CONTROL
MOTOR REMOVAL
(2) Do not clean the sensor and motor by dipping them into the
solvent. Clean them with shop towel.
(1) Do not remove the throttle valve.
(2) Check if the vacuum port or passage is clogged. Use
compressed air to clean the vacuum passage.
INSPECTION
DASH POT - DOHC TURBO
Up to 1992 models
(1) Push the rod of the dash pot all the way in and close the
nipple with the fingers,
(2) If the rod does not protrude after releasing it, the dash pot is
functioning normally.
(3) If the rod protrudes, a broken diaphragm is suspected.
Therefore, replace the dash pot.
From 1993 models
(1) Push the dash pot rod in lightly and confirm the resistance.
NOTE
2. If the rod can be pushed in with no resistance, either
the diaphragm or check valve is faulty.
(2) Release finger and confirm that the rod returns to its
original position quickly.
NOTE
If the rod returns slowly, the check valve is faulty.
TSB Revision