Ignition Timing
- Start engine, and warm it to normal operating temperature. Turn engine and all accessories off. Connect timing light to No. 1 spark plug wire. Connect a fused jumper wire between terminals No. 1 (Orange/Yellow wire) and No. 3 (Black/Blue wire) of White 3-pin Data Link Connector (DLC), located behind right kick panel. See Fig 1
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- Start engine with accelerator depressed. Allow engine idle to stabilize. Check timing mark alignment on crankshaft pulley with timing marks on timing belt cover. Notch on crankshaft pulley should line up at 10 degrees BTDC on timing indicator at each flash of timing light.
- If adjustment is required, loosen distributor hold-down bolt, and rotate distributor until a 10-degree BTDC reading is obtained. Tighten distributor hold-down bolt to 15 ft. lbs. (20 N.m). Recheck ignition timing.
- Turn engine off. Remove jumper wire from DLC. Remove timing light.
Courtesy of GENERAL MOTORS CORP.