Colt Vista 2WD L4-1795cc 1.8L SOHC (1992)
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. SEE THROTTLE
BODY CLEANING.
