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Locate the service check connector and, if applicable, remove the cap. On 1988-91 Preludes, the cap is yellow and the connector is located next to the vacuum control box in the engine compartment. On 1992-95 Preludes, the service connector is located under the middle of the dash. On 1990-93 Accords, the connector is blue and is located behind the right front kick panel, under the dashboard. On 1994-95 Accords, the service connector is located behind the glove box. Use a jumper wire to connect the two terminals of the service connector.
- Following the manufacturers instructions, connect a timing light to the engine. The positive and negative leads connect to their corresponding battery terminals and the spark plug lead to No. 1 spark plug wire.
- Make sure that all wires are clear of the cooling fan and hot exhaust manifolds.
- Set the parking brake and block the front wheels. Start the engine. Check that the idle speed is set to specifications.
- Point the timing light at the timing marks. On all models except 1994-95 Accords, the marks are on the flywheel. On the 1994-95 Accords, the timing marks are on the crankshaft pulley. When the engine is idling, the red mark must align with the pointer. Some timing marks are indicated by 3 lines; the center one must be aligned with the pointer.
- If necessary to adjust the timing, loosen the distributor hold-down bolt(s) and/or nut and slowly rotate the distributor in the required direction while observing the timing marks.
- To complete the adjustment operation, tighten the hold-down bolt, taking care not to disturb the adjustment.
- Switch the engine OFF . Reinstall the rubber plug in the timing window and remove the timing light. Remove the jumper wire.
Fig. Fig. 4: Service connector on 1988-91 Preludes
Fig. Fig. 5: Service connector on 1992-95 Preludes
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