Ignition Timing: Adjustments

- Start engine and warm it up to normal operating temperature.
- Stop engine once, keep ignition switch ON for 5 seconds and then start engine again.
- Run engine at 2,000 rpm for 5 minutes so that it is fully warmed and then keep it running at idle speed.
- Make sure that all electrical loads except ignition are switched off.
- Check to be sure that idle speed is within specification.
- Set timing light to No. 1 high tension cord.

"Fixing" Ignition Timing:

- Remove cap from monitor connector beside battery.
- Connect "C" and "D" terminals of monitor connector by using service wire so that ignition timing is fixed.

NOTE: CHECK ENGINE" light lights at this time. This does not mean anything faulty but that "D" terminal (test switch terminal) is grounded.
Using timing light, check to make sure that ignition timing doesn't change even when engine speed is increased. If it does, that indicates ungrounded "D" terminal which prevents accurate inspection and adjustment. Therefore, be sure to ground it securely.

Timing Marks:

- Using timing light, check that timing is within specification.

INITIAL IGNITION TIMING (TEST SWITCH GROUNDED)
8° ± 1° BTDC at 800 rpm

FIRING ORDER
1 - 3 - 4 - 2

Adjusting Ignition Timing:

- If ignition timing is out of specification, loosen flange bolts, adjust timing by turning distributor assembly while engine is running, and then tighten bolts.
- After tightening distributor flange bolts, recheck that ignition timing is within specification.
- After checking and/or adjusting, disconnect service wire from monitor connector.

CAUTION: Driving with test switch terminal grounded will cause damage to catalyst. Be sure to disconnect service wire after adjustment.

NOTE: In this state, ignition timing may vary more or less of 8° BTDC but it is nothing abnormal.

- Check that increasing engine speed advances ignition timing. If not, check TPS (idle switch), test switch terminal circuit, engine start signal circuit and ECM.