Ignition Timing

CAUTION: Some tachometers may not be compatible with ignition system. Consult tachometer manufacturer before connecting tachometer to ignition system. To avoid possible damage to ignitor and/or coil, DO NOT allow tachometer terminal to become grounded.

Warm engine to normal operating temperature. Shut engine off. Connect timing light to spark plug wire on cylinder No. 1.
Remove fuse box cover and connect scan tester to data link connector No. 3. See Fig 1. Scan tester is used to read engine RPM.
Apply parking brake. Place transmission Neutral. Start engine and maintain engine at 2500 RPM for 90 seconds and then allow engine to idle. Ensure idle speed is 600-700 RPM.
Install Jumper Wire (SST 09843-18020) between terminals TE1 and E1 of data link connector No. 1. See Fig 2.
NOTE: Timing marks are located on front cover.
Ensure base timing is within specification at idle with transmission in Neutral, A/C and all accessories off. See the 6-CYLINDER IGNITION TIMING table.
If ignition timing is incorrect, loosen distributor hold-down bolt. Adjust ignition timing by rotating distributor. Tighten distributor hold-down bolt.
Remove jumper wire from data link connector No. 1. Ensure advance timing is within specification. See 6-CYLINDER IGNITION TIMING table. Remove timing light and scan tester.

6-CYLINDER IGNITION TIMING (Degrees BTDC @ Idle)

Application ⁽¹⁾

⁽²⁾ Base Timing

⁽³⁾ Advance Timing

Land Cruiser

2-13

⁽¹⁾	Check with engine at normal operating temperature, transmission in Neutral, parking brake applied, A/C and all accessories off.

⁽²⁾	With jumper wire installed between terminals TE1 and E1 on Data Link Connector No. 1.

⁽³⁾	With jumper wire removed from DLC No. 1.

Fig 1: Connecting Tachometer Or Scan Tester

Fig 2: Installing Jumper Wire Between DLC No. 1 Terminals