Mazda Trucks 1972-1986 Repair Guide

Idle Speed

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GASOLINE PISTON ENGINES



  1. Thoroughly warm the engine to normal operating temperature. The water temperature gauge will tell you when normal operating temperature is reached.
  2.  
  3. Make sure that the choke valve is fully open. On 1978 and later models, run the engine at 2,000 rpm for 3 minutes. Disconnect the canister purge hose at the canister.
  4.  
  5. Connect a tachometer according to the manufacturer's instructions.
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  7. Adjust the idle speed screw to specifications.
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  9. Disconnect the tachometer. Connect the purge hose on 1978 and later models.
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ROTARY ENGINES



  1. Warm the engine to normal operating temperature.
  2.  
  3. Be sure that the secondary throttle valve is fully returned.
  4.  
  5. Set the parking brake and block the front wheel.
  6.  
  7. Connect a tachometer according to the manufacturer's instructions.
  8.  
  9. Adjust the idle speed to specifications. The idle speed should ONLY be adjusted with the idle air screw. Never use the idle fuel jet screw to adjust the idle. This screw is preset at the factory and should not be moved.
  10.  
  11. After idle speed adjustment, you should also have the mixture checked with a CO analyzer.
  12.  

 
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