See Figures 1, 2 and 3
All models utilize a crank angle sensor in the distributor. This sensor is used to provide engine position information to the Electronic Control Unit (ECU). The ECU regulates ignition timing electronically, therefore no vacuum or centrifugal advance is used. Also, because of the ECU control, no periodic service adjustments are necessary. However, if timing or idle speed problems are suspected a combined ignition timing and idle speed inspection procedure is provided.
The following procedure should only be used as part of the timing and idle speed inspection found on the flow charts at the end of the section. No periodic timing settings should be required by these vehicles. ALSO, always refer to the instructions or specifications found on the Vehicle Emission Control Information (VECI) label found underhood for additional or updated information which is applicable to your particular vehicle.
- Run the engine until it reaches normal operating temperature.
- Open the hood, and race the engine at 2000 rpm for about 2 minutes under no-load (all accessories must be OFF, including the air conditioner).
- Run the engine at idle speed.
- Race the engine two or three times under no-load, then run the engine for one minute at idle.
- Check the idle speed. If necessary, adjust the idle speed to specifications by turning the idle speed adjusting screw. For details please refer to the Tune-Up Specifications Chart.
- Connect a timing light according to the light manufacturer's instructions. Adjust the timing by loosening the distributor hold-down bolt(s) and turning the distributor clockwise to advance and counterclockwise to retard.
- Once the proper timing setting is reached, hold the distributor steady and tighten the hold-down bolt(s). After the distributor is secured, recheck the timing to verify it did not move while tightening the retainer(s).
- Once the inspection is finished, stop the engine, then remove the timing light and tachometer.