Would A bad MAF cause this.....???? - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 03-19-2007
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Would A bad MAF cause this.....????

In my 98 Ranger my check engine light is on. I had it scanned and it was saying that I had a MAF problem. I forgot the code..sorry. it was also telling me that I was running too lean and I had bad O2 sensors. So, I have yet to fix these problems and I can swear to you that I am getting AT BEST 10 miles to the gallon. I drive 30 miles to work one way and when I get home I would have used up a little over 1/4 tank. Are these problems causing my poor mileage? I love my truck....but this mileage is killing me and my wallet. HELP!!!
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Old 03-19-2007
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It would be more economical to fix the problems, than to keep paying 3 bucks a gallon and only getting 10 miles to it.

Yes, a bad MAF can cause very poor gas mileage.

Yes, a bad O2 sensor can cause very poor gas mileage.

However, fix the MAF first, before trying the O2. It's possible the MAF is causing a lean/rich condition which is tripping the O2 sensor problem.

Remove the negative lead from your battery.
Get a can of Electronic Parts cleaner at the auto parts store. Remove your MAF from the intake tube and air box lid.
Spray the tiny electrical contacts lightly with cleaner, and let it drip-dry.
Re-install and reconnect the battery making sure all electrical connections are secure. If you still get the same message, you'll need to replace the MAF.
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Old 03-19-2007
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Thank you so much for that...I plan on taking care of my MAf on my next day off.
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Old 03-19-2007
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Depending on the mileage of the truck, I don't think O2 sensors are that expensive and changing them should be considered normal maintenance. They are also not that difficult to change out. Usually a bad MAF sensor will cause the truck to run very poorly. Mine would barely run when it went bad.
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Old 03-19-2007
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My 02 sensors were $29.99 each, which I consider much more expensive than a bottle of electrical cleaner for $5.
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Old 03-20-2007
04 EDGE
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your O2 sensors are not bad! there setting a lean code cause there reading full lean from the exhaust, when this happens the PCM trys to compensate buy dumping more fuel into the motor so you dont burn it up. .

auto zone maks a killing selling O2 sensors from there "free check engine light" scam!


you need to check for a VACUUM leak first. fords are known for there PCV tubes and hoses to go bad causing this sort of code. if you got P171 and P174 (lean bank one and two) then chances are you have a vacuum leak somewhere.
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Old 03-20-2007
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i second "04 edge" responce

the computer reads the amout of air entering the engine via the MAF if you have a vacuume leak between the MAF and the Pistons then your getting "false air" the computer interprits this as a faulty MAF because it thinks the MAf is reading incorrectly BUT its just not reading all of the air entering the engine..

so start your vehicle make sure its in park and go open the hood...
listen for a sucking sound and try to narrow down the area its comming from, once you narrow it down to within a few inch radiu you can use a piece of hose and put it up to your ear and listen with it to eliminate outside noise so you can pinpoint the leak .. if that doeant work you can use a small.. SMALL amount of brake cleaner when you hit the leak the enigne will change idle speed and or sound different and might even missfire...

good luck JOSH
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Old 03-20-2007
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my old 98 ran the exact same thing... i changed the MAF and it fixed it for about a month, then the check engine light came back on. i ignored for a few days and changed the spark plugs cuz they just needed to be changed. the light went away and never came back
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Old 03-21-2007
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So Johnny...did ya clean the MAF?
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