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.

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.

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 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].)