Question about 2002 Ford Ranger Regular Cab

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Terrible fuel milage

I have a 2002 ford ranger with a 4.0 v-6 that will only get around 15 miles to the gallon and on the original window sticker it say it should be around 23-24 i have done a full tune up and the truck only has 70,000 miles does anyone have any suggestions of how i might improve my milage

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  • Anonymous Jul 26, 2008

    I have larger tires, so maybe that is problem. Haven't checked catalytic yet...



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Check your intake system thoroughly to make sure every connection is tight and there are no possibilities for vacuum leaks. Any extra air after the air flow sensor will get adjusted for by the on-board computer and extra fuel given to compensate for the extra air. Too much air will sure get detected and a trouble code will be stored. I bought a used 2002 Ford Ranger and a tube from intake to pcv valve was leaking enough to send a code.

Posted on Aug 07, 2008

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I agree that even though manufacturers lie a lot, that spread between the stated economy and what you are seeing is too big.
Be cautious however, of the thousands of wild claims out there; neither the EPA nor Consumers Union found any device or additive that really did any good.
Another point; if you have non-factory wheels and tires, they may have a much greater outside diameter which can give you false readings of mileage driven and the engine could be operating less efficiently because of the torque demand of the larger wheels.

One suggestion; have someone in the truck while you listen at the tailpipe.
Starting at an idle, try to determine if the exhaust has 'thumping' sounds that come from the engine firing, this would be normal.
Have them very gradually raise the idle speed and note whether the sound changes in character; that is, does it go from a normal sound of a muffled firing engine or does it become more of a constricted hissing sound.

If you notice that it is hissing, you could have an early failure of the catalytic convertor.
If these disintegrate internally, they can lose material enough to start clogging the muffler which will introduce too much backpressure for the engine to overcome.

When this happens, it also generally causes the engine to run at a higher temperature, maybe not 'in the red' but higher.
Once the clog reaches a certain level, the engine will become hard to start when hot.
If cold, the material from the catalytic convertor can shrink and loosen, temporarily freeing the muffler so that the system is not as restricted and the car will function OK for a few minutes.

Posted on Jul 08, 2008


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Posted on Jan 02, 2017

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