California Only

Checking And Adjusting Idle Speed And CO %, (Calif. only)

Preconditions:

Engine oil temperature min. 60°C (140°F)
Intake air sensor must be 20°C (68°F)
All electrical equipment must be OFF
Hose for charcoal filter must be disconnected and blocked at air filter

Note: To check engine rpm on vehicles with oxygen sensor and electronic ignition (Calif. vehicles), resistor adaptor must be used in conjunction with commercial tach/dwell meter

Work Sequence





- Assemble and connect adapter according to illustration
- Check idle speed (with idle stabilizer connected)
850 - 950 rpm





- Disconnect plugs on idle stabilizer and connect together (arrow)
- Check ignition timing and if necessary adjust
5° ATDC at idle and vacuum hoses connected
- Check idle speed and if necessary, adjust
850 - 950 rpm (at adjusting screw)
- Reconnect idle stabilizer
- Start engine and while watching the ignition timing, slowly increase engine speed to at least 900 rpm
- Release throttle
Idle must now be: 850 - 950 rpm
- If timing setting does not change with changes in rpm, replace idle stabilizer

Note: Before checking or adjusting CO, idle speed and ignition timing must be within specifications

- Connect CO meter according to manufacturer's instructions
- Connect CO probe ahead of catalytic converter at probe receptacle





- Disconnect oxygen sensor (arrow)
- Check CO; if necessary adjust at CO adjusting screw
0.7 ±0.4%

Note: If CO cannot be adjusted following components may be defective:
Injectors
Spark plugs
Vacuum leak between cylinder head and intake air sensor

- Reconnect oxygen sensor
CO must be within specifications

- Secure CO adjusting screw with blue cap