Lean condition on bank 1 and bank 2

Discussion in '1993 - 1997 Ford Ranger' started by Shaq, Jan 2, 2021.

  1. Shaq

    Shaq New Member

    Hey guys i bought a 4.0 l 97 ranger , but its giving me p0171 and p0174 on obs reader

    it shakes when idling (600-700rmp) after its hot

    when i remove the iac valve wiring it gets to really low rmps while shaking or dies down

    any help will be greatly appreciated
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  3. RangerAl

    RangerAl Member

    Seem like you have unaccounted air going into the intake. Check for any air leak from the filter to the throttle body. There is vacuum line from the vale cover to the intake, make sure it is on intake tube. Sometime, when replacing air filter these vacuum line will fall off.

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