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Home >> Mitsubishi >> 1997 >> Diamante 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. DO NOT  attempt to adjust ignition timing by rotating distributor.
  2. Start engine and warm engine until engine temperature coolant is 176-203°F (80-95°C). Turn engine off. Insert a paper clip in engine speed detection connector terminal No. 3. See Fig 1 . Connect a primary voltage detection-type tachometer to paper clip.
    Fig 1: Locating Engine Speed Detection Connector
    G97E07046Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  3. Install a timing light. Start engine and allow it to idle. Ensure engine curb idle speed is about 700 RPM. Turn engine off. Curb idle speed is automatically controlled by Idle Air Control (IAC) system. If curb idle speed is not as specified, see DTC P0505 in 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. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of dash, near steering column. Start engine and allow it to idle. Using scan tool, select MFI SYSTEM ACTUATOR TEST, then select item 30. Press "Y" and read basic ignition timing value. See IGNITION TIMING  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 DTC P0335 in TESTS W/CODES article.
  5. Read actual ignition timing value. If actual ignition timing is notwithin specification, cancel MFI system actuator test. See DTC P0335 in TESTS W/CODES article.
IGNITION TIMING (Degrees BTDC @ RPM)

Application (1) Basic (2)(3) Actual
3.5L 2-8 @ 600-800 (4) 15 @ 600-800
(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).
(4) Actual ignition timing is approximate and may fluctuate plus or minus 8 degrees.
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