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    raceheavy's Avatar
    raceheavy Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Jun 18, 2008, 08:06 PM
    Engine backfiring
    I have a 3 year old Craftsmen lawn tractor. Up until Saturday all was well. Saturday when I started the tractor, it starts fine but now backfires. The idol is also not steady ( goes up and down ). It does this at full choke and with the choke closed. I have changed the oil, filter, air filter and spark plugs. The Gas filter looks OK, so I have not changed it. It still has the original battery. Could the battery be the problem?
    MOWERMAN2468's Avatar
    MOWERMAN2468 Posts: 3,214, Reputation: 243
    Ultra Member
    		  
    #2

    Jun 19, 2008, 05:29 AM
    No. Chek for fuel contamination; and valves
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