Ignition Timing: Testing and Inspection

NOTE: Incorrect ignition timing can cause idle speed changes. Conversely, incorrect idle speed can affect the ignition timing. Ignition timing and idle speed should be adjusted concurrently.

1. Confirm initial inspection conditions:
a. Engine coolant temperature is 185 - 205°F.
b. Lights, cooling fan and all accessories are OFF.
c. Transaxle is in neutral or park.
d. Steering wheel is in straight-ahead position, (on vehicles with power steering).

2. Connect a strobe timing light to the #1 ignition cable (R.H.).

Tachometer Connection:

3. Connect the pick-up lead of a tachometer to the connector.
4. Start the engine and check the curb idle speed setting.

Curb Idle Speed: 750 ± 100 RPM

Grounding Ignition Timing Adjustment Connector:

5. Stop the engine and ground the terminal for ignition timing adjustment with a jumper wire.

Fig. 50 Checking Ignition Timing:

6. Start the engine and check the ignition timing at idle speed.

Base Ignition Timing: 5° BTDC

Adjusting Ignition Timing:

7. If not as specified, loosen the crank angle sensor hold down nut and rotate the unit until the timing marks align.

NOTE: Rotating the sensor clockwise advances timing.

8. Tighten the hold down nut and stop the engine.

Torque Spec: 10 - 12 Nm (7 - 9 Ft. lbs.)

9. Disconnect the jumper wire from the terminal for ignition timing adjustment.
10. Start the engine and check the idle advance timing at idle speed.

Idle Advance Timing: 10° BTDC

11. This timing specification is controlled by the engine control module and is NOT adjustable.
12. Disconnect and remove the tachometer and timing light from the engine.