Ignition Timing

IGNITION TIMING (Degrees BTDC @ RPM) ⁽¹⁾

Application

Man. Trans.

Auto. Trans.

SFI

⁽²⁾ 4-6 @ 800

⁽²⁾ 5 @ 800

TBI

⁽³⁾ 7-9 @ 800

⁽¹⁾	See Fig 1 for timing mark location.

⁽²⁾	With jumper wire installed between 6-pin duty check data link connector terminals No. 4 (Black wire) and No. 5 (Blue/Red wire), between right strut tower and battery.

⁽³⁾	With jumper wire installed between 4-pin duty check data link connector terminals "C" (Black wire) and "D" (Blue/Red wire), located between right strut tower and battery.

NOTE: Ensure ignition timing advances as engine speed increases.

Fig 1: Locating Ignition Timing Mark

Courtesy of GENERAL MOTORS CORP.