LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 1993 >> SC 400 >> Repair and Diagnosis >> Engine Performance >> Engine Controls - Adjustments >> Ignition Timing >> Es300, GS300 & SC300
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Es300, GS300 & SC300

  1. Ensure engine is at normal operating temperature. Connect timing light magnetic pick-up to spark plug wire for cylinder No. 1. Connect tachometer test lead to terminal IG- of DLC. See Figure. Connect jumper wire between terminals TE1 and E1 of DLC.
  2. Ensure idle speed is within specification. See IDLE SPEED SPECIFICATIONS table under IDLE SPEED & MIXTURE. Check base timing. If base timing is within specification, go to next step. See IGNITION TIMING table. If base timing is not within specification, adjust timing by rotating distributor, then go to next step.
  3. Disconnect jumper wire from DLC. Check controlled timing. Ensure controlled timing is within specification. See IGNITION TIMING table. If controlled timing is not within specification, problem exists in engine control system.
scientia non olet · About LEMON Manuals