Mazda MX-5 NA silhouetteMX-5 NA

ENGINE TUNE-UP PROCEDURE

B-9prose procedure
Continued from B-8

Inspection / Adjustment (continued)

  1. 3
    If the marks are not aligned, loosen the crank angle sensor lock bolt and adjust by turning the crank angle sensor.
    Engine view showing the crank angle sensor with lock bolt; used for adjusting ignition timing by rotating the crank angle sensor.
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  2. 4
    Tighten the crank angle sensor lock bolt.
  3. 5
    After adjusting the ignition timing, disconnect the SST or jumper wire from the diagnosis connector.
  4. 6
    Increase the engine speed and verify that the ignition timing advances.
    Crankshaft pulley close-up showing the timing marks used to verify ignition timing advance with engine speed increase.
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Tightening torque (crank angle sensor lock bolt)
19 - 25N·m

Idle Speed

Inspection / Adjustment

  1. 1
    Connect the SST or jumper wire to the diagnosis connector. (Refer to page B-8.)
    SST 49 B019 9A0 system selector connected to vehicle; inset shows the diagnosis connector with GND and TEN terminals identified and TEST SW. label visible.
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  2. 2
    Verify that the idle speed is within specification.
  3. 3
    If the idle speed is not within specification, remove the blind cap from the air adjusting screw and adjust it.
    Engine bay view showing the air adjusting screw on the throttle body area used to adjust idle speed.
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  4. 4
    After adjusting the idle speed, install the blind cap and disconnect the SST or jumper wire from the diagnosis connector.
Idle speedNeutral
850 ± 50 rpm
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