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2002 Honda Civic Strangely Low Gas Mileage

Tiny
BUSUAN
  • MEMBER
  • 2002 HONDA CIVIC
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 51,000 MILES
My Civic 2002 coupe ran at usually 30+mil/gal. It started to deteriorate 2 years ago, down to 24mil/gal. Since 3 months ago, it has been 20+mil/gal only.
I have my car serviced regularly. But I suspect something has been neglected all the time, because it suddenly jumped back to 30+mil/gal after I had the oil changed about 3 weeks ago, shortly before it fell to 20+mil/gal again. I guess the guy touched something right but didn't really fix it.
I haven't noticed any fuel or engine oil leakage. And my driving habit haven't really changed either. My car passed SMOG test about 1 year ago.
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Thursday, November 20th, 2008 AT 3:34 PM

1 Reply

Tiny
MHPAUTOS
  • MECHANIC
  • 31,938 POSTS
HI there,

Start with a full tune, and have a scan done as well, make sure that the valve clearances are checked and replace the O2 sensor as they do deteriorate and when they do the send a signal to the ECU to run rich, start there.

Mark (mhpautos)
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Friday, November 21st, 2008 AT 5:02 AM

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