ENGINE TUNE-UP [F2]

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Engine Tune-up Preparation

Using the M-MDS

1. Warm up the engine to normal operating temperature.

2. Shift the transmission into neutral.

3. Turn off all electrical loads.

• A/C switch

4. Verify that the steering wheel is at straight ahead position.

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

Not using the M-MDS

1. Warm up the engine to normal operating temperature.

2. Shift the transmission into neutral.

3. Turn off all electrical loads.

• A/C switch

4. Verify that the steering wheel is at straight ahead position.

Caution

• Connecting the wrong DLC terminals may possibly cause a malfunction. Carefully connect the specified terminals only.

5. Connect a dwell tachometer to the DLC terminal IG-.

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Ignition Timing Adjustment

Using the M-MDS

Caution

• Connecting the wrong DLC terminals may possibly cause a malfunction. Carefully connect the specified terminals only.

1. Perform “ENGINE TUNE-UP PREPARATION”. (See Engine Tune-up Preparation.)

2. Use a jumper wire to short terminal TEN of the DLC to body ground.

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3. Verify that the RPM PID is within the specification.

• If not as specified, adjust the idle speed. (See Idle Speed Adjustment.)

Specification

730—770 rpm

4. Connect the timing light to the high-tension lead of the No.1 cylinder.

5. Verify that the timing mark on the crankshaft pulley is within the specification.

• If not as specified, loosen the distributor lock bolts and turn the distributor to make the adjustment.

Ignition timing

BTDC 5°—7° [730—770 rpm]

6. Tighten the distributor lock bolts to the specified torque.

Tightening torque

19—25 N·m {1.9—2.6 kgf·m, 14—18 ft·lbf}

7. Disconnect a jumper wire.

8. Verify that the timing mark on the crankshaft pulley is within the specification.

Specification

BTDC 1°—30°

Not using the M-MDS

Caution

• Connecting the wrong DLC terminals may possibly cause a malfunction. Carefully connect the specified terminals only.

1. Perform “ENGINE TUNE-UP PREPARATION”. (See Engine Tune-up Preparation.)

2. Use a jumper wire to short terminal TEN of the DLC to body ground.

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3. Verify that the idle speed is within the specification.

• If not as specified, adjust the idle speed. (See Idle Speed Adjustment.)

Specification

730—770 rpm

4. Connect the timing light to the high-tension lead of the No.1 cylinder.

5. Verify that the timing mark on the crankshaft pulley is within the specification.

• If not as specified, loosen the distributor lock bolts and turn the distributor to make the adjustment.

Ignition timing

BTDC 5°—7° [730—770 rpm]

6. Tighten the distributor lock bolts to the specified torque.

Tightening torque

19—25 N·m {1.9—2.6 kgf·m, 14—18 ft·lbf}

7. Disconnect a jumper wire.

8. Verify that the timing mark on the crankshaft pulley is within the specification.

Specification

BTDC 1°—30°

Idle Speed Adjustment

Using the M-MDS

Caution

• Connecting the wrong DLC terminals may possibly cause a malfunction. Carefully connect the specified terminals only.

1. Perform “ENGINE TUNE-UP PREPARATION”. (See Engine Tune-up Preparation.)

2. Use a jumper wire to short terminal TEN of the DLC to body ground.

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3. Verify that the RPM PID is within the specification.

• If not as specified, verify that the ignition timing is within specification according to the “IGNITION TIMNG ADJSTMENT”, then adjust the idle speed by turning the AAS.

Specification

730—770 rpm

Caution

• The TAS is set at the factory and must not be adjusted. Any adjustment will negatively affect the engine performance.

4. Disconnect a jumper wire.

Not using the M-MDS

Caution

• Connecting the wrong DLC terminals may possibly cause a malfunction. Carefully connect the specified terminals only.

1. Perform “ENGINE TUNE-UP PREPARATION”. (See Engine Tune-up Preparation.)

2. Use a jumper wire to short terminal TEN of the DLC to body ground.

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3. Verify that the idle speed is within the specification using the dwell tachometer.

• If not as specified, verify that the ignition timing is within specification according to the “IGNITION TIMNG ADJSTMENT”, then adjust the idle speed by turning the AAS.

Specification

730—770 rpm

Caution

• The TAS is set at the factory and must not be adjusted. Any adjustment will negatively affect the engine performance.

4. Disconnect a jumper wire.

5. Disconnect the dwell tachometer.

Idle-up Speed Inspection

Using the M-MDS

1. Perform “ENGINE TUNE-UP PREPARATION” (See Engine Tune-up Preparation.)

2. Verify that the idle speed is normal. (See Idle Speed Adjustment.)

3. Verify that the RPM PID is within the specification.

• If not as specified with all load conditions, inspect the IAC valve.

• If not as specified with all load conditions, inspect the related input switches, harnesses, and connectors.

Idle speed

Load condition	Idle-up speed (rpm)^*1
P/S ON^*2	700—800
A/C ON^*3	780—880

*1 :Excludes temporary idle speed drop just after the electrical loads (E/L) are turned on.

*2 :Steering wheel is fully turned.

*3 :A/C switch and fan switch are on.

Not using the M-MDS

1. Perform “ENGNE TUNE-UP PREPARATION”. (See Engine Tune-up Preparation.)

2. Verify that the idle speed is normal. (See Idle Speed Adjustment.)

3. Verify that the idle-up speed is within the specification.

• If not as specified with all load conditions, inspect the IAC valve.

• If not as specified with some load conditions, inspect the related input switches, harnesses, and connectors.

Idle speed

Load condition	Idle-up speed (rpm)^*1
P/S ON^*2	700—800
A/C ON^*3	780—880

*1 :Excludes temporary idle speed drop just after the electrical loads (E/L) are turned on.

*2 :Steering wheel is fully turned.

*3 :A/C switch and fan switch are on.

Idle Mixture Inspection

1. Perform “ENGNE TUNE-UP PREPARATION”. (See Idle Speed Adjustment.)

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

3. Turn the test mode off.

4. Warm up the engine by holding the engine speed at 2,500—3,000 rpm for approx. 3 min.

5. Insert an exhaust gas analyzer to the tailpipe.

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

• If there is malfunction, refer to "ENGINE SYMPTOM TROUBLESHOOTING". (See ENGINE SYMPTOM TROUBLESHOOTING [F2].)

Idle mixture

HC concentration: Within the regulation

CO concentration: Within the regulation