Stays in open loop (?)
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Northstar Engines and System Technical Discussion Discussion, Stays in open loop (?) in Cadillac Engine Technical Discussion; Why would my 97 N* stay in open loop when idling? Scanner says one bank is lean and indicates a ...
  1. #1
    tolooka is offline Cadillac Owners Member
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    Stays in open loop (?)

    Why would my 97 N* stay in open loop when idling? Scanner says one bank
    is lean and indicates a misfire, as high as -24 to -26 fuel trim on one cylinder (not all read the same), at higher rpms it is still lean, but much less, -4 to -8 and an intermitant misfire. I really need help, any ideas? Thanks.

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  3. #2
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Stays in open loop (?)

    I am not sure if the FPR will cause this but it is an easy check if you haven't done so already.

  4. #3
    mastertech is offline Cadillac Owners Fanatic
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    Re: Stays in open loop (?)

    Check your o2 sensor operations....sounds like you have a lazy one.

  5. #4
    tolooka is offline Cadillac Owners Member
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    Re: Stays in open loop (?)

    Thanks, FPR checked and I put in 2 new Delco O2 sensors, didn't do the trick, so I'm thinking O2 ground circuit, does this make sense?

  6. #5
    mcowden is offline Cadillac Owners Connoisseur
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    Re: Stays in open loop (?)

    Quote Originally Posted by tolooka
    Thanks, FPR checked and I put in 2 new Delco O2 sensors, didn't do the trick, so I'm thinking O2 ground circuit, does this make sense?
    How are your plugs and wires? Had the fuel rail recall work done recently? Did the FPR hold a vacuum?
    Mike

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