Galant L4-20L SOHC (1989) Throttle Body Specifications
Purge Port Vacuum Curve
2.
Start the engine and check to see that, after increasing the engine speed, vacuum remains fairly constant.
NOTE: If there is a problem with the changes in vacuum in either test, it is probable that the throttle body requires cleaning. Refer to COMPONENT
REPLACEMENT AND REPAIR PROCEDURES
For diagnosis and testing of the motor position sensor (MPS), idle switch, throttle position sensor (TPS) and the idle speed control (ISC) servo, refer to
COMPUTERIZED ENGINE CONTROLS.
