Ignition Timing

NOTE: Verify that increasing engine speed advances ignition timing.

Start engine and allow it to reach normal operating temperature. Ensure all accessories are off and idle speed is within specification. Adjust idle speed first if it is not within specification. See IDLE SPEED under IDLE SPEED & MIXTURE.
CAUTION: Driving with jumper wire installed in test connector will damage catalytic converter.
Connect terminals No. 4 (Black wire) and No. 5 (Blue/Red wire) of White test connector, located next to left strut tower. See Fig 1 . Aim timing light at timing cover timing marks. If ignition timing is not within specification, loosen Camshaft Position (CMP) sensor hold-down screws and rotate sensor to obtain correct ignition timing. See IGNITION TIMING table. Tighten CMP sensor hold-down screws and recheck ignition timing.

IGNITION TIMING (Degrees BTDC @ RPM) ⁽¹⁾

Application

Man. Trans.

Auto. Trans.

1.8L

⁽²⁾ 4-6 @ 750-850

⁽¹⁾	See Figure for timing mark location.

⁽²⁾	With jumper wire installed between terminals No. 4 (Black wire) and No. 5 (Blue/Red wire) of White test connector, located next to left strut tower. See Fig 1 .

Fig 1: Test Connector Terminals

Courtesy of GENERAL MOTORS CORP.