2010 Ford Fusion SE

Asked by GuruVN7D1 Aug 30, 2018 at 05:56 AM about the 2010 Ford Fusion SE

Question type: Maintenance & Repair

was getting 26mpg now just 21mpg changed sparkplug

2 Answers
10

Taylor answered 5 years ago

Were the new plugs properly gapped? If the gap's too narrow, it'll be dumping extra fuel into the cylinders to get it to adequately spark. Otherwise, air filter or O2 sensors are most likely culprits.

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