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Lean condition codes- both banks??

Discussion in 'Stock 1995 - 2001 Explorers' started by MatBirch, December 9, 2018.

^^Searches ExplorerForum.com^^

  1. MatBirch

    MatBirch New Member

    December 9, 2018
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    Year, Model & Trim Level:
    ‘96 Explorer Limited
    Hey gang, new to the forum here, although I’ve spent many hours here already searching and learning.

    My wife’s 96 limited with the OHV motor threw a CEL here about a month ago. Lean condition left... right... you know the drill, I’m sure. I’ve searched a ton and spent many hours under the hood, and online. Most info I find on this involves the sohc motors however. One consistent recommendation I find is the intake gaskets. I find it very hard to believe that BOTH gaskets would fail at the exact same time! No?
    Work I’ve done so far- in order of action
    1- Inspected all vacuum hoses, boots, and fittings I could find, with nothing found
    2- Cleaned IAC
    3- Disconnected IAC plug while running. Engine stumbled and nearly died which should indicate no vacuum problems(?)
    4- Replaced PCV and inspected hose.
    5- Replaced IAC as it was howling through the vent anyway...

    EGR has been recommended, however won’t that throw it’s own code?

    Symptoms are as follows-
    At idle, not always, but increasing in frequency, the truck will start to hunt and the rpms will drop in a rhythmic fashion. Kind of the opposite of a “surging”. Eventually it will stall. If you keep your foot in it, it runs great. Have not noticed a decrease in fuel economy.
    Cold start is usually fine, but once it drops off high idle, it will start acting up. My wife has difficulty getting it warmed up enough to clear windows, warm the interior, etc before leaving for work.
    I did notice the other night when backing her in to a trailer (truck was at operating temp) that the exhaust smelled like chlorine. Swimming pool. I really don’t believe I was mistaking it for an ammonia smell. I really thought swimming pool/ hot tub instantly.

    I purchased this truck from a friend who is the service writer at one of the top shops in town. It originally belonged to a former client of theirs. It has been meticulously maintained over it’s lifespan. Sadly, I can’t afford to just pay them shop rate to troubleshoot this.

    Thanks for the help!
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  3. SoHK_alumni

    SoHK_alumni Active Member

    July 29, 2014
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    City, State:
    Tampa, FL
    Year, Model & Trim Level:
    5.0 V8 2002 Ranger
    MAF, FPR or fuel pump are all suspects for both banks going lean at same time.

    Try cleaning the MAF 1st then check fuel pressure.
    • Like Like x 1
  4. lobo411

    lobo411 Active Member

    September 14, 2011
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    Year, Model & Trim Level:
    1996 Explorer 4.0 OHV
    How many miles? The lower intake manifold gaskets on the OHV are a common failure point. They generally start leaking coolant from the two coolant passages at the front and the rear of each side. They can also cause an air leak, which can result in a lean condition. I'd replace them on general principles in a 22 year old Explorer because the failure is so common.
  5. massacre

    massacre Elite Explorer

    January 24, 2018
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    1994 Explorer XLT
    ^^^ +1
    I had both banks lean code, cleaned MAF replaced fuel filter has not come back in 5 months

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