Ignition Timing

Ensure engine is at normal operating temperature. Connect timing light to either No. 1 or No. 4 cylinder. Loosen distributor clamping bolts and turn distributor in either direction until timing is within specifications. See Fig 1 and IGNITION TIMING table.

Fig 1: Isuzu Timing Mark Location

Courtesy of ISUZU MOTOR CO.

IGNITION TIMING (DEGREES BTDC @ RPM)

Application

Setting

I-Mark

Non-Turbo

Man. Trans.

⁽¹⁾ 15 @ 750

Auto. Trans.

⁽¹⁾ 10 @ 1000

Turbo

15 @ 950

Impulse

12 @ 900

Pickup

2.3L

6 @ 900

2.6L

12 @ 900

Trooper II

12 @ 900

⁽¹⁾	With vacuum hose connected. Ignition timing is 3 degrees BTDC with vacuum hose disconnected and plugged.