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post #1 of 5 Old 05-15-2019, 07:51 AM Thread Starter
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850i engine

own a 2016 850i with 100 hrs. yesterday motor started backfiring while spraying fencelines. By time I emptied tank, noticed a significant loss of power and backfiring much worse. Just changed oil and same fuel is being used in all mowers. Any ideas where to start?
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post #2 of 5 Old 05-15-2019, 08:20 AM
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Paging @jd772 thoughts?

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post #3 of 5 Old 05-15-2019, 10:15 PM
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Well not showing any codes , flashing wrench on dash. I would start with out listening to it see is it back firing out the exhaust. or intake, that will tell us what is happening. I would start double check you have clean good fuel. it is so easy to get water in fuel , the fuel now days picks up so much water with ethanol , even in the filter. will have a lot of water. Also make sure park brake is releasing or the brake switch ok may cause this. will start here !!!!
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post #4 of 5 Old 05-24-2019, 04:10 PM
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also check the spark arrestor. they were bad on stopping up on the earlier models when they werent ran very hard. had a gator that had lose of power. did a service and changed air filter still had no power turned out to be the spark arrestor was stopped up.

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post #5 of 5 Old 05-29-2019, 06:37 AM Thread Starter
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Thanks for all the suggestions to help. Finally tore enough of cage apart to change plugs, gas filter, and spark arrestor. Emptied old gas and replaced with new. Running much better but still less power than when new? Give it time.
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