Question about 2003 Ford Explorer Sport

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1998 FORD EXPLORER SPORT 4X2 4.0 OHV

I KEEP GETTING CODES PO171 AND PO174, BANK 1 AND BANK 2 LEAN. SO FAR I HAVE SPRAYED CARB. CEANER ALL OVER ENGINE AND INTAKE TO CHECK FOR VACUUM LEAKS, RAN SEA FOAM THROUGH FUEL, OIL, AND INTAKE, REPLACED O2 SENSORS, SPARK PLUGS, MASS AIR FLOW SENSOR, FUEL FILTER, AND THE IDLE AIR CONTROL VALVE. AFTER RESETING THE CODES I GET ABOUT 50 - 60 MILES AND THEY ARE BACK. PLEASE HELP.

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  • finley79 Dec 27, 2008

    I have replaced the o2 sensors and the mass air flow as well. I cant see a vacuum leak. I read something about the o rings on the intake. Looks like a big job. I keep getting the engine light after resetting the sensor. Any help?

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I have 98 explorer im getting same codes ive worked on cars all my life I havent replaced anything but my fuel filter so far on the explorer and that wasnt it.I know people tell you to replace all that other stuff,but if you know cars and how the stuff works thats on a car then you can fix anything with out people telling you;you need to buy this and then this and there just fishing when the dont know there as* and whole in the ground.Im going to replace my lower and upper intake seals like he says above.At least theres one more smart one out there and not someone that thinks they know it all like people that work in the parts places and some dealers.

Posted on Jan 23, 2009

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Unless you monitor the fuel trims while spraying the intake there is no way to see if there is leaking seals. these seal leaks are common especially in cold weather. I would recommend replacing them if they were never changed especially with high mileage

Posted on Dec 14, 2008

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From Twitter by @carpartslocator.

@car_problems oxegen sensor oar the airflowmeter.but i do not know what kind of car you have i am gessing ford....??

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1998 FORD EXPLORER 4X2 SPORT 4.0 OHV


Check for engine vacuum leaks, use a can of carburetor spray and spray around the top of the engine, pay close attention to the intake manifold, if there is a leak the engine will speed up a little, also the MAF may be defective, cleaning it does not always fix the issue, which is the heated sensor wire no sending the correct signal. My knowledge base? Ford certified Master electronics technician.

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