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An SI engine sometimes continues to run for a very small period even after the ignition is switched off. This phenomenon is called
  • a)
    Over burning
  • b)
    Pull up period
  • c)
    Dieseling
  • d)
    Throttle sticking
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
An SI engine sometimes continues to run for a very small period even a...
Dieseling is the phenomenon in which an SI engine sometimes continues to run for a very small period even after the ignition is switched off. Dieseling may take place due to following reasons:
  • Engine overheating
  • Too high spark plug heat range
  • High engine idling speed
  • Oil entry into the cylinder
  • Increase in compression ratio due to carbon deposits
  • Incorrect adjustment of idle fuel-air mixture
  • Sticking of throttle
  • Requirement of tune up of engine
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