MPG dropping on 02' Expl.
Thread Starter
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Tuned
Joined: Nov 2003
Posts: 339
Likes: 1
MPG dropping on 02' Expl.
Seems my 02' Expl. MPG has dropped some.It has 140k on it and used to get close to 400 miles on a tank, now I'm down to 320 miles on a tank.I did replace plugs at 100k and still have original wires, but I don't think the wires would have that kind of effect.Engine seems to run pretty well.Any ideas?Also, has anyone dropped their gas tank and replaced the sending unit, mine is messed up.I tried some Chevron injector cleaner which was recommended on this site.thanks
Posting Guru
Joined: May 2002
Posts: 2,450
Likes: 2
From: Baltimore
You need a Ford fuel line removal tool (about $8). There are many posts on the replacement process. It is a bit of a pita the first time you do it.
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Laughing Gas
Joined: Jan 2005
Posts: 1,055
Likes: 3
From: Magnolia, TX
"MAF" = Mass Airflow Sensor.
Do a search in the Tech section. I believe there are some pics of it. It's a sensor that is on the air duct from the filter housing just downstream from said filter. 2-prong connector IIRC.
Remove connector, remove MAF. You'll see 2 very small wire elements THAT YOU DO NOT EVER TOUCH. If they have any fuzz or goop on them, use real honest to god "MAF Sensor Cleaner" spray from a good auto parts store. Spray, allow to air dry, re-install carefully.
If you did find crap on the MAF, after you re-install it, disconnect the NEG battery wire for several hours to allow the computer data tables to clear. The computer will re-learn the engine conditions with the newly cleaned MAF.
CMOS
Do a search in the Tech section. I believe there are some pics of it. It's a sensor that is on the air duct from the filter housing just downstream from said filter. 2-prong connector IIRC.
Remove connector, remove MAF. You'll see 2 very small wire elements THAT YOU DO NOT EVER TOUCH. If they have any fuzz or goop on them, use real honest to god "MAF Sensor Cleaner" spray from a good auto parts store. Spray, allow to air dry, re-install carefully.
If you did find crap on the MAF, after you re-install it, disconnect the NEG battery wire for several hours to allow the computer data tables to clear. The computer will re-learn the engine conditions with the newly cleaned MAF.
CMOS
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Laughing Gas
Joined: Jan 2005
Posts: 1,055
Likes: 3
From: Magnolia, TX
Originally Posted by twisted limb
Found the MAF, but seems it takes a special tool for the two screws that hold it on the air duct.Looks like a torx with some little nipple sticking up in the middle?
Correct.
You either:
1) get a "security torx" bit from AutoZone or
2) Use a Dremmel to make a slot in the head of the screws so that you can use a flat blade screwdriver.
I'd suggest you go get the security Torx.
CMOS
Thread Starter
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Tuned
Joined: Nov 2003
Posts: 339
Likes: 1
I was at Advance Auot Parts before I read your post and found the MAF cleaner.They do not have the bit so I did not get the cleaner yet.Also, why can't the sensor be cleaned still attatched to the plenum?I pulled the plenum off while putting in a new filter and could see the little wires in there and they did look clean.No debris that I could see on them.thanks
Laughing Gas
Joined: Jan 2005
Posts: 1,055
Likes: 3
From: Magnolia, TX
Originally Posted by twisted limb
I was at Advance Auot Parts before I read your post and found the MAF cleaner.They do not have the bit so I did not get the cleaner yet.Also, why can't the sensor be cleaned still attatched to the plenum?I pulled the plenum off while putting in a new filter and could see the little wires in there and they did look clean.No debris that I could see on them.thanks
You're going to get a much better view and cleaning if you take it off.
CMOS