Changed both upstream O2 sensors as per the code reader....no change. Replaced the air idle control sensor....no change. It won't stay running unless you keep pumping the gas..at which time it runs rough and backfires..and has no sense of power. checked for vacuum leaks..couldn't find any. Before it quit running it would idle very fast ( screaming )..without touching the gas pedal.
All code readers will retrieve information stored while in the on position --doesnt need to be running ---when you rehook up scanner either resubmit or edit request with codes
SOURCE: 1998 FORD EXPLORER SPORT 4X2 4.0 OHV
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.
SOURCE: location of O2 sensor in bank 2, 99 5.4 expedition, running lean
I have a ford 2003 windstar that was running very rough when cold and almost stalling. engine light came on. went to autozone and they read the codes for free and told me it was running lean on Bank 2 also. i came home searched for the O2 front sensors online using the info autozone gave me. there are 2 front sensors on my car that need to be replaced at the same time. look for ones that have a direct plug in and don't need wire splicing. the ones without the wiring harness are cheaper but more of a pain, i think.
they were fairly easy to replace. getting access with the wrench was the worst. reset the light by disconnecting the battery for a few minutes. seems fine now and the light hasn't come back on.
SOURCE: 97 Ford Ranger 4.0L V6 Idles rough only when cold
Orand
Ther is a air Idle control valve located on the side of the throttle body. unplug it remove it spray it and clean it with carb cleaner replace it plug it back in and you will be a Happy person again.
Lugnut61
SOURCE: TOO LEAN CODES
yes very very common code for these motors i get them all the time. now the first thing i do is listen to the pcv valve for noise if it is rattling this is the problem and is the most common of all. another thing is the intakes leak from cracks in them but the only way to find it is with a smoke machine. now the one other thing i have seen before is debre like a leaf in the mass air flow sensor but you have replaced it so most likely no that.
do your self a favor and change the pcv valve it only cost under 5 dollars. if this is not it you will need to find the leak in and around the intake or a vacuum hose.
because you have two lean banks this mean if it is a leak then it has to be in common with both banks and that is the vacuum line system intake etc...
let mew know if you have any more question. good luck man
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