Idle Mixture Inspection

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

Verify that the idle speed and ignition timing are within the specification. (See IDLE SPEED INSPECTION .) (See Ignition Timing Inspection .)
Insert an exhaust gas analyzer into the tailpipe.
Verify that the CO and HC concentrations are within regulation.
- If there is a malfunction, refer to "ENGINE SYMPTOM TROUBLESHOOTING". (See SYMPTOM DIAGNOSTIC INDEX .)
  - If no malfunction is detected, replace the catalytic converter. (See EXHAUST SYSTEM REMOVAL/INSTALLATION .)
  CO concentration
  
  Within the regulation
  
  HC concentration
  
  Within the regulation