ENGINE BACKFIRING

Dear Bob

As an operator of Cessna 172S with engine , Lycoming  IO360-L2A.

fOLLOWING TROUBLE HAVE EXPERIENCE WHILE  START  RUNING THE ENGINE

"ENGINE BACKFIRING DURING START AND SHUT DOWN"

Could you please tell me the cause of this defect.

Thankk you

Regards

Zaven

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