GM Metro/Sprint 1985-1993 Repair Guide

Timing

Imprimir

INSPECTION AND ADJUSTMENT



Sprint

See Figure 1



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Fig. Fig. 1: Timing mark location

  1. Start and run the engine until it reaches normal operating temperature. Stop the engine.
  2.  
  3. Connect a tachometer to the negative terminal of the ignition coil. Connect a timing light to the No. 1 spark plug wire. Refer to the underhood sticker.
  4.  
  5. Check and/or adjust the idle speed to specification.
  6.  
  7. Aim the timing light at the timing marks and check the timing.
  8.  
  9. To adjust the ignition timing, loosen the distributor hold-down bolt and rotate the distributor until the correct timing marks are aligned.
  10.  
  11. Tighten the distributor hold-down bolt to 11 ft. lbs. (15 Nm) and recheck the timing.
  12.  

Metro
CONVENTIONAL SPARK CONTROL IGNITION
  1. Start and run the engine until it reaches normal operating temperature. Stop the engine.
  2.  
  3. Connect a tachometer to the negative terminal of the ignition coil. Connect a timing light to the No. 1 spark plug wire. Refer to the underhood sticker.
  4.  
  5. Check and/or adjust the idle speed to specification.
  6.  
  7. Disconnect the vacuum line at the intake manifold gas filter and plug the gas filter.
  8.  
  9. Aim the timing light at the timing marks and check the timing.
  10.  
  11. To adjust the ignition timing, loosen the distributor hold-down bolt and rotate the distributor until the correct timing marks are aligned.
  12.  
  13. Tighten the distributor hold-down bolt to 11 ft. lbs. (15 Nm) and recheck the timing.
  14.  
  15. Reconnect the vacuum line at the gas filter. The timing should advance. If not, check for a vacuum leak or check the vacuum centrifugal advance mechanism for proper operation.
  16.  

ELECTRONIC SPARK CONTROL (ESC) IGNITION

See Figures 2 and 3

  1. Start and run the engine until it reaches normal operating temperature. Stop the engine.
  2.  



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Fig. Fig. 2: Four terminal check connector



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Fig. Fig. 3: Six terminal check connector

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