Idle Speed: Adjustments
PREPARATION1. Warm up the engine to the normal operating temperature.
2. Shift the transaxle into Neutral (Manual Transaxle [TX]) or P position (Automatic Transaxle [TX]).
3. Turn off all electrical loads.
- Headlight
- Blower motor
- Rear window defroster
- Power steering
4. Wait until the coolant fan stops.
5. Connect the SSTs (NGS tester) to the data link connector 2 and select the PID/DATA MONITOR AND RECORD function.
6. Select the "RPM" on the NGS tester display.
IGNITION TIMING
1. Perform "Preparation".
2. Verify that the idle speed is within the specification.
Specification:
MTX: 650 - 750 (700 ± 50) rpm
ATX: 700 - 800 (750 ± 50) rpm
3. If not as specified, adjust the idle speed.
4. Connect the SST (System Selector) data link connector.
5. Set switch A to position 1.
6. Set the test switch to SELF TEST.
7. Connect a timing light to the high-tension lead of the No.1 cylinder.
8. Verify that the timing mark (yellow) is within the specification.
Specification:
BTDC 9 - 11° (10 ± 1°)
9. If not as specified, loosen the distributor lock bolts and turn the distributor to make the adjustment.
10. Tighten the distributor lock bolts to the specified torque.
Tightening torque:
19 - 25 Nm (14 - 18 ft. lbs.)
11. Disconnect the SST (System Selector) to the data link connector.
12. Verify that the timing mark (yellow) is within the specification.
Specification:
BTDC 6 - 18°
IDLE SPEED
1. Perform "Preparation".
2. Connect the SST (System Selector) to the data link connector.
3. Set switch A to position 1.
4. Set the test switch to SELF TEST.
CAUTION:
- The throttle adjusting screw is set at the factory and must not be adjusted. Any adjustment will negatively effect the engine performance.
5. Adjust the idle speed by turning the air adjusting screw.
Specifications:
MTX: 650 - 750 (700 ± 50) rpm
ATX: 700 - 800 (750 ± 50) rpm
6. Disconnect the SST (System Selector).
IDLE UP SPEED
1. Perform "Preparation".
2. Verify that the idle speed is within the specification.
Specifications:
MIX: 650 - 750 (700 ± 50) rpm
ATX: 700 - 800 (750 ± 50) rpm
3. If not as specified, adjust the idle speed.
4. Verify the idle speed with the following load conditions.
NOTE:
- Excludes temporary idle speed drop just after the electrical loads are turned on.
5. If not as specified with all load condition, inspect the idle air control valve. If not as specified with some load condition, inspect related input switches, harnesses and connectors.
IDLE MIXTURE
1. Perform "Preparation".
2. Verify that the idle speed and ignition timing are within the specification.
3. Insert an exhaust gas analyzer to the tailpipe.
4. Verify that the CO and HO concentrations are within the regulation.
5. If not, inspect the following.
a. On-board diagnostic system
b. Heated oxygen sensor
c. System inspection
1) Intake manifold vacuum
2) Fuel line pressure
3) Ignition timing control
6. If the systems are normal, replace the three way catalytic converter and/or the warm up three way catalytic converter.