Inspect timing mark indicator and timing mark notch. Clean marks if necessary. See Figure and Figure . Start and warm engine to normal operating temperature. Ensure idle speed is 700 RPM. See IDLE SPEED SPECIFICATIONS. Turn off engine and all accessories. Attach timing light to No. 1 spark plug wire.
Connect fused jumper wire between ALDL connector terminals No. 1 and 3, located under right side instrument panel or behind kick panel. See Fig 1 . Start engine and aim timing light at crankshaft pulley. Timing should be at 10 degrees BTDC.
If timing is not 10 degrees BTDC, loosen distributor flange hold-down bolts and rotate distributor to obtain correct ignition timing. Tighten distributor flange hold-down bolts to 15 ft. lbs. (20 N.m) and recheck timing.
Remove jumper wire from ALDL connector. Turn ignition off and remove timing light.

Fig 1: Locating ALDL Connector (Storm)

Courtesy of GENERAL MOTORS CORP.

IGNITION TIMING SPECIFICATIONS (Degrees BTDC @ RPM)

Application

Man. Trans.

⁽¹⁾ Auto. Trans.

Storm & Storm GSi

⁽²⁾ 10 @ 700

⁽¹⁾	With automatic transmission in Park or Neutral.

⁽²⁾	With jumper wire installed in ALDL connector located behind right side of instrument panel. See Fig 1 .

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Base Timing