1998 Mitsubishi Eclipse GS-T, AutomaticFACTORY OEM SERVICE PROCEDURE

All Other Models

  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. See Figure. 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 idle 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 (BASIC IGNITION TIMING). 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 (except Mirage 1.5L), 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 (except Mirage 1.5L), P0105, P0115 and P0335 in appropriate TESTS W/CODES article.
Chapter Navigation
Return to Chapter: Ignition Timing
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.