Fuel mileage dropped quickly from 21 or 22 mpg down to 16 or 17 mpg

Tiny
JRPRO
  • MEMBER
  • 2001 TOYOTA TACOMA
  • 382,000 MILES
I am about to replace the spark plugs & air filter and I have heard that the oxygen sensor or temp sensor may improve my fuel mpg. So are there any sensors, etc. You would recommend to improve the fuel mpg I am getting. This truck has the 4 cyl. 2.7L and is a 5-speed 4X4 extra cab.
Sunday, August 18th, 2013 AT 10:23 PM

1 Reply

Tiny
DRCRANKNWRENCH
  • MECHANIC
  • 3,380 POSTS
If you have never replaced the oxygen sensors they could use changing especially with the mileage on your truck. Oxygen sensors give air/fuel ratio data to the truck's ECU which in turns regulates the amount of fuel the engine gets. So, the oxygen sensor, there is probably more than one, is the best sensor to change to improve gas mileage. The next thing to look at is your emissions system including your EGR valve, EVAP and even your PCV valve. To really get a good sense of what sensors and components are borderline, and I suggest this with the mileage of your truck, get the trouble codes pulled. Advance Auto or Auto Zone will do this for free.
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Sunday, August 18th, 2013 AT 10:54 PM

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