2.5L horrble gas mileage!12mpg! - Ranger-Forums - The Ultimate Ford Ranger Resource


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  #1  
Old 10-04-2010
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2.5L horrble gas mileage!12mpg!

I have a 98 Power Ranger with a 2.5L in it.It's got around 217,000 miles on it.its been well maintained from the previous owner...which is some people i'm related to.Its a standard and i know how to drive it...so no,i dont dog it out or shift out of high rpm's.I recently replaced the fuel filter and changed the plugs and wires on it...except for the two under the intake manifold.i couldnt get to those two so im going to deal with that when necessary.It runs fairly well and idle's fine.It does drip water from the exhaust(I'm sure if that makes a differnce in anything or if that tells you about how the condition its in lol i know ive seen brand new cars do it).My question is i have been getting terrible gas mileage since ive got the truck and it is killing me.It take me 10 dollars to get to and from my swim meets which is 50 miles total.Gas is right around 2.50 a gallon so thats about 4 gallons it takes to get there and back.So thats like 12.5mpg...i realize it has high mileage but i dont think the motor is that worn out because an old lady has had it for a very long time.So what can be my problem??What things should i check out or clean or what?
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Old 10-04-2010
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Clean MAFS, IAC, change the air filter, at that mileage I would change the o2 sensors also. Any check engine lights?
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Old 10-04-2010
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the air filter is new.i dont have any lights on but tomorrow im going to see if any codes can be pulled though..whats the IAC stand for?
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Old 10-05-2010
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i tried to pull some codes today and everything was clear..
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Old 10-05-2010
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swap o2 sensors and clean the maf for sure. also check the exhaust for a leak before the sensors.
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  #6  
Old 10-05-2010
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i dont have any lights on,wouldnt the o2 sensors throw a code if they were bad?
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Old 10-05-2010
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Quote:
Originally Posted by auluva13 View Post
i dont have any lights on,wouldnt the o2 sensors throw a code if they were bad?
Not necessarily. They could be just getting 'lazy'
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  #8  
Old 10-05-2010
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ok,well is there anything else besides cleaning the maf and replacing the o2 sensors you can think of that could be the problem?also what is the IAC you were talkin about that i needed to clean?
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Old 10-06-2010
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Idle air control valve, however unless you were idling high I doubt this is causing the bad mileage. I'd run a bottle of injector cleaner in your next tank of gas.
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  #10  
Old 10-06-2010
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i put a can of seafoam in the tank and ran it through awhile back...and it doesnt idle high or anything it idles fine..
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Old 10-06-2010
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spark plugs and wires it changed mine so much i get like 18 now and i'm lifted
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Old 10-06-2010
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I already did that.and mines 2wd
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Old 10-07-2010
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How bout the ignition coil?
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Old 10-07-2010
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Also are your tires properly inflated?
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Old 10-07-2010
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the coil should be fine?it fires good.and the tires are fine.even if they werent it wouldnt cause that big of an mpg drop.
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Old 10-10-2010
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First off, finish doing the spark plugs and wires. Did you seafoam before or after changing the plugs? Most people recommend changing all the plugs after you use seafoam.

Check for vacuum leaks. It might not be throwing codes or acting funny, but you can still have leaks. A few of mine are starting to get cracked up, and two are darn near sand.

As mentioned, changing things like the sensors and EGR could find the problem.

You may want to pull the throttle body to clean that out and make sure it's operating properly. Might be a good idea to pull the upper and lower intakes to clear them out.

The "throttle cable mod" might help you get some more air into the mixture.

Did you see any contaminates or smell any diesel when you emptied out the fuel filter?
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  #17  
Old 10-11-2010
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i cleaned the maf and im getting alot better mpg guys!i really appreciate all the info you guys have given me and advice!
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  #18  
Old 10-11-2010
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Good to hear it man. Keep us up to date on anything else you find and how much it helps your mileage. It might be helpful to others when they notice their mpg numbers dip.
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  #19  
Old 10-12-2010
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im pretty sure im gettin around 8-12 better mpgs.im pretty sure it was never cleaned before and its been driven up and down a dirt road basically its whole life.
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  #20  
Old 10-21-2010
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i had the same problem on my 01 2.5, it turned out to be the entire egr system, i replaced 2 egr sensors and ended up having to replace the entire system, 400 bucks and it runs like a dream, went from about 16 mpg to 22
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  #21  
Old 10-25-2010
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1999 2.5l standard and the avg is 18-19, Highest I got is 22 lowest I got is 16.
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  #22  
Old 10-25-2010
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take out your air mass sensor and any other sensor on the intake tube. turn it on and leave it for a few min. while it running after few min... put all sensor back on and leave it for a few min. then take a drive.
work for my 1999 it improve mine about few mpg, it was usually 250-300 miles and now it 385 from the last time i check it
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  #23  
Old 11-30-2010
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Good for you auluva13. I'm sorry if I am late on giving advices. Next time you have a problem I will help you in time. :D
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  #24  
Old 11-30-2010
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Now that it is running better you should check the throttle cable for play and maybe pull the battery for a while to reset the ECU and make it re-learn the cleaner sensors. Or is the MAF one that does not need this?
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  #25  
Old 12-03-2010
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Speakeing of the Maf What should u clean the with? i belive i have seen Maf cleaner somwhere or at least heard about it
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