Ignition Timing W/Adjustments

Checks and adjustments are made in the following conditions:

- Headlamp switch: OFF
- Heater blower: OFF
- Air conditioning switch: OFF (if equipped)
- Steering: KEEP WHEELS STRAIGHT AHEAD (if equipped with power steering)

a. Disconnect distributor vacuum hose from distributor vacuum controller, and pug hose with proper plug.
b. Run engine at about 2,000 rpm for about 2 minutes under no-load. Then, run engine at - idle speed and ensure that engine speed is below 1 ,000 rpm.
c. Race engine two or three times under no. load. Then run engine at idle speed for one minute.






d. Check ignition timing with a timing light and adjust as necessary.
e. Connect distributor vacuum hose.
f. Race engine two or three times under no-load and run engine at idle speed.









g. Check idle speed and if necessary adjust to the specified rpm by turning the idle speed adjusting screw.

Check throttle valve switch adjustment. Refer to Throttle Valve Switch Test of E.C.C Electrical System Inspection.

Check idle CO%. The checking or adjustment of the idle CO% requires the use of a CO meter. It is essential that the meter be fully warmed up and calibrated before any adjustment is made.

1. Verify that engine is at operating temperature.






2. Disconnect vacuum hose from vacuum switch and plug hose with proper cap.
3. Run engine at 2,000 rpm for 2 minutes under no-load to stabilize its condition.
4. Race engine two or three times under no-load and run engine for one minute at idle speed.
5. Reset idle speed to the specified speed.






6. Check CO% as per Table, Column 1 and if necessary, adjust to the specified point as per Table, Column 2. The CO% adjustment is made by turning the idle mixture screw. Refer to Idle Mixture Adjusting.

7. Stop engine, and reconnect vacuum hose to vacuum switch.
8. Check idle speed. Readjust to the specified speed.