NOTE: Verify that increasing engine speed advances ignition timing.

Warm engine to normal operating temperature. Turn engine off, but keep ignition on for 5 seconds. Restart engine and raise engine speed to 2000 RPM for 5 minutes. Return to idle. 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.
Connect timing light to No. 1 spark plug wire. Remove cap from duty check Data Link Connector (DLC), located near fusible link box, by battery. On TBI models, connect a jumper wire between terminals "C" (Black wire) and "D" (Blue/Red wire) of duty check DLC. See Fig 1 . On SFI models, connect a jumper wire between terminals No. 4 (Black wire) and No. 5 (Blue/Red wire) of duty check DLC. See Fig 2 .
On all models, check timing mark alignment on crankshaft pulley with timing marks on timing belt cover. Ignition timing must be within specification. See the IGNITION TIMING .
If ignition timing is not as specified, loosen distributor hold-down flange bolts and rotate distributor to obtain correct ignition timing. Tighten distributor hold-down flange bolts to 15 ft. lbs. (20 N.m). Recheck ignition timing.
Turn engine off. Remove jumper wire and install cap on duty check DLC. Remove test equipment.

IGNITION TIMING

Application

Man. Trans.

Auto. Trans.

SFI

⁽¹⁾ 4-6 @ 800

⁽¹⁾ 5 @ 800

TBI

⁽²⁾ 7-9 @ 800

⁽¹⁾	With jumper wire installed between 6-pin duty check data link connector terminals No. 4 (Black wire) and No. 5 (Blue/Red wire), located between right strut tower and battery.

⁽²⁾	With jumper wire installed between 4-pin duty check data link connector terminals "C" (Black wire) and "D" (Blue/Red wire), between right strut tower and battery.

Fig 1: Identifying Monitor Coupler Terminals (TBI)

Courtesy of SUZUKI OF AMERICA CORP.

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

Ignition Timing