ENGINE TUNE-UP [L8, LF]

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Engine Tune-up Preparation

1. Verify the following:

  • AT: Selector lever is in P or N position.
  • MT: Shift lever is in neutral position.

2. Verify that no DTCs are available.

3. Warm up the engine (ECT is approx. 80 °C {176 °F} or more) as follows.

  (1) Start the engine.

  (2) Racing at the engine speed 2,500—3,000 rpm for 3 min.

4. Turn off the electrical loads.

5. Wait until the cooling fans stop.

6. Connect the M-MDS to the DLC-2.

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7. Verify that the idling speed (M-MDS: RPM PID) is within the specification using the M-MDS function.

  Standard

  AT: 700—800 rpm
  MT: 670—770 rpm

Ignition Timing Inspection

  Note
  • Ignition timing is not adjustable.
  • Ignition timing verification requires M-MDS.

1. Verify that the ignition timing (M-MDS: SPARKADV PID) is within the specification using M-MDS.

  Ignition timing

  Approx. BTDC 8 °

2. Verify that ignition timing advances when the engine speed increases gradually.

  • If there is malfunction, refer to “ENGINE SYMPTOM TROUBLESHOOTING”. (See ENGINE SYMPTOM TROUBLESHOOTING [L8, LF].)

Idle Speed Inspection

  Note
  • Idle speed is not adjustable.
  • Idle speed verification requires M-MDS.

1. Verify that the idle speed (M-MDS: RPM PID) is within the specification using M-MDS.

  • If there is malfunction, refer to “ENGINE SYMPTOM TROUBLESHOOTING”. (See ENGINE SYMPTOM TROUBLESHOOTING [L8, LF].)

  Idle speed

  No load: 670—770 rpm (MT), 700—800 rpm (AT)
  Electrical loads (38—48 A): 700—800 rpm
  Electrical loads (more than 48 A): 800—900 rpm
  P/S ON: 700—800 rpm (MT), 750—850 rpm (AT)
  A/C ON: 825—925 rpm (MT), 775—875 rpm (AT)

Idle Mixture Inspection

1. Verify that the idle speed and ignition timing are within the specification. (See Idle Speed Inspection.) (See Ignition Timing Inspection.)

2. Insert an exhaust gas analyzer to the tailpipe.

3. Verify that the CO and HC concentrations are within the regulation.

  • If there is malfunction, refer to “ENGINE SYMPTOM TROUBLESHOOTING”. (See ENGINE SYMPTOM TROUBLESHOOTING [L8, LF] ENGINE SYMPTOM TROUBLESHOOTING [L8, LF].)

  Idle mixture

  HC concentration: Within the regulation
  CO concentration: Within the regulation