Loss of gas milage

Tiny
PHOTOMAN407
  • MEMBER
  • 2014 HONDA CIVIC
  • 1.8L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 58,000 MILES
I to have tuned up our car, always checked the tires and air filter. Burn synthetic oil and gone from 31 to 21 miles per gallon.
Saturday, February 23rd, 2019 AT 1:57 PM

1 Reply

Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello,

This could be a spark plug gap problem. If the spark plugs didn't get properly gapped this could account for poor mileage. Is your Malfunction Indicator Lamp(MIL) a.K.A. "Check engine" light illuminated? I have included a troubleshooting guide for in the diagrams below. Get back to us with what you find out.

Thanks,
Alex
2CarPros
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Saturday, February 23rd, 2019 AT 6:09 PM

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