Camry Sedan 2WD V6-2507cc 2.5L DOHC (2VZ-FE) (1990)
Idle Up Control Valve: Testing and Inspection
1. Start engine and warm-up to normal operating temperature.
2. Check idle speed.
Idle Speed:
650 ± 50 rpm
3. Disconnect vacuum hose from throttle opener and plug hose end.
Checking Throttle Opener Adjustment
4. Maintain engine rpm at 2,500 rpm with throttle valve.
5. Release throttle valve suddenly and check throttle opener setting speed.
Setting Speed:
1,300 - 1,500 rpm
NOTE: With Cooling Fan OFF
6. If not within specifications, adjust to proper speed by lengthening or shortening the plunger rod.
Adjusting Throttle Opener
7. Reconnect the vacuum hose and ensure that the throttle opener plunger is pulled back, allowing the idle to return to normal.
Reconnecting Vacuum Hose To Throttle Opener
8. If diaphragm does not retract, use a handheld vacuum pump to check for a ruptured diaphragm.
9. If a problem is found, replace the throttle opener.
10. If diaphragm is OK, check vacuum hose or throttle body for a blockage.
11. If a blockage is indicated, refer to THROTTLE BODY for proper cleaning procedure.