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Home >> Mitsubishi >> 1997 >> Galant LS >> Repair and Diagnosis >> Engine Performance >> Engine Controls - Adjustments >> Ignition Timing

Ignition Timing

NOTE: Perform all checks with engine at normal operating temperature, cooling fan and accessories off, transmission in Park or Neutral, and front wheels in straight-ahead position.
  1. Ignition timing is controlled by Powertrain Control Module (PCM) and is not adjustable. Manufacturer provides procedure for checking timing. On models with distributor, DO NOT attempt to adjust ignition timing by rotating distributor.
  2. Connect scan tool to Data Link Connector (DLC). DLC is located below dash, near steering column. Install a timing light. Start engine and allow it to idle.
  3. Using scan tool, read curb idle speed (RPM). Ensure curb idle speed is about 750 RPM. Turn engine off. Curb i speed is automatically controlled by Idle Air Control (IAC) system. If curb idle speed is not as specified, see DTC P0505 in appropriate TESTS W/CODES article.
    CAUTION: MFI system actuator test must be cancelled or test will continue to run for 27 minutes. Driving vehicle under this condition may damage engine.
  4. Using scan tool, select MFI SYSTEM ACTUATOR TEST, then select item 17. Read basic ignition timing value. See IGNITION TIMING SPECIFICATIONS table. If basic ignition timing is within specification, go to next step. If basic ignition timing is not within specification, cancel MFI system actuator test. See DTCS P0100, P0105, P0115 and P0335 in appropriate TESTS W/CODES article.
  5. Read actual ignition timing value. If actual ignition timing is not within specification, cancel MFI system actuator test. See DTCS P0100, P0105, P0115 and P0335 in appropriate TESTS W/CODES article.
IGNITION TIMING (Degrees BTDC @ RPM)

Application (1) Basic (2)(3) Actual
2.4L 2-8 @ 650-850 10 @ 650-850
(1) With ignition timing adjustment connector grounded or vacuum hose (farthest from distributor) disconnected.
(2) With ignition timing adjustment connector ungrounded or vacuum hose (farthest from distributor) connected. Actual ignition timing is approximate and may fluctuate.
(3) If vehicle altitude is more than 2300 feet above sea level, actualtiming may be advanced (5 degrees).
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