96 explorer lean bank 1 code

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Nov 6, 2009 | 09:25 AM

alans77crew

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From: Idaho

96 explorer lean bank 1 code

I'll give you some history first, on 4-16-08 I replaced clyinder heads with updated heads,no problems then a short while after that imagine this if you will those crappy cork gaskets started leaking 6.00 a quart oil all over the place so I replaced them with metal rubber gaskets! problem solved. Then not a week later it started throwing this lean bank 1 code, of course you have to take the plenum off to change the valve cover gaskets and yes I replaced those gaskets also with new one's! I have checked for vacume leak's and can not seem to find one ,but all indication lead me back to thinking there is one. when I start it it idle's high and of course I'm getting this lean code! could it be a o2 sensor or does that show a different code???? any help would be appreciated! thanks Alan

Nov 6, 2009 | 08:15 PM

steve(ill)

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you need the specific code, but basically its 49% chance its the manifold gasket, 49% chance it is a dry rotted or burnt vacuum line, and 2% chance its the O2 sensor.

Nov 6, 2009 | 08:17 PM

steve(ill)

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that being said, i did have a bank 2 code on our 2002 that the specific code lead me to believe it was the O2 sensor and not a vacuum line. I pulled the electrical connector and it had a spot of contamination on 1 of the 4 pin terminals. cleaned it and o.k.

Nov 7, 2009 | 09:33 AM

alans77crew

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From: Idaho

Thanks for the response Steve! Well I've check every vacuum line I could find and could not find anything so I guess I'll replace them all if need be (not that many). I'll get the specific code today and let you know! there is one area of concern,there seems to be a heat riser of sorts at the front of the plenum right behind the the throttle body where it goes into the plenum I could not get a factory gasket for it so I found an o ring that fit it, but does not seem to be leaking there no increase in rpm's when I put the propane bottle up to it,also I'll check the connectors

Nov 7, 2009 | 09:36 AM

alans77crew

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From: Idaho

also replaced plenum gaskets when i replaced valve cover gaskets the intake was also new when i replaced heads problem didn't start till valve cover gaskets were replaced!

Nov 7, 2009 | 01:09 PM

steve(ill)

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off hand, i would be looking for a vacuum hose that is swelled, hard, or cracked. i have had problems specifically on those connected to the EGR and high heat areas close to exhaust manifold, or stainless riser tubes.

Nov 17, 2009 | 07:14 PM

alans77crew

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From: Idaho

well sorry it took so long got sick! the code is a po171, I also did some research on line and found a sight that clean the maf which I did and while I was doing that noticed a cracked vacume line repaired that cleared the code and so far no re appearance of the code yet !!!!! Wish me luck