Hunting Idle and Misfire
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Thread: Hunting Idle and Misfire

  1. #1
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    Default Hunting Idle and Misfire

    Hi,

    I have just bought chassis 194 and it has. hunting idle and misfire.

    The previous owner but 1 fitted an Accufab plenum and throttle body. Would this need mapping into the ECU? I have the original TB and plenum so can have that fitted to see if it solves the running issues

  2. #2
    #829 called 'Olive' David's Avatar
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    No ECU 'jiggling' would be needed (possible?).
    I suggested to the previous owner that he swapped the throttle body back to original, so he may already have tried that. Ask him.
    I know he had investigated the throttle-stop as causing a problem and that didn't help.

    There is masses of technical information here for full-members, which you cannot yet access.

    Best would be to 'upgrade' your registration to full membership now you own a 260.
    Send a PM to Tim asking for a questionnaire and giving him your email address for reply. Membership is free to those already members of the MGOC, otherwise you would have to apply to join at least. If for no other reason, opening up the "treasure chest" of 260 information here is worth the £50 for MGOC membership. Club shop is then open to you too.

    David

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    Thanks David. That is helpful and I will certainly email Tim. I am already an MGOC member

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    Registered User Pete's Avatar
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    Robert the first thing you need is a scan tool to check for codes and fuel trim data.
    I used to be indecisive but now I'm not so sure.
    When you have eliminated the impossible, whatever remains, however improbable, must be the truth

    2004 MG ZT 260SE Pearl Black
    1960 MGA Roadster Flame Red

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    Registered User SCP440's Avatar
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    If you scan the car it would also be usefull to get live data, poor fuel pressure and/or a faulty Lambda are more easily spotted with live data.

    Steve

  6. #6
    #829 called 'Olive' David's Avatar
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    As I said, if I were you, the first thing I would do is to ask the seller what he has already tried. Saves spinning wheels and going off in the wrong direction.

    David
    Last edited by David; 21-04-2022 at 07:52 PM.

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    Again all good advice - thanks all. Am swapping back to original TB and plenum and will plug in tomorrow.

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    Quote Originally Posted by robertbrook View Post
    Again all good advice - thanks all. Am swapping back to original TB and plenum and will plug in tomorrow.
    If you decide to run the car with the standard TB and the find the Accufab wants a new home…..

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    Assuming the previous owner hasn't checked this then chek all rubber and plastics in the intake side that can go brittle and develop a sneaky crack and air leak at our advancing years.

    Jez Marsh

    372 ZTT SE PBT
    M 260 MG

  10. #10
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    Again thanks for all the helpful info.

    I took the car to a local MG Rover specialist and it is indeed leaking air. Will hopefully be on the road soon and will then tackle the other bits starting with the alloys - not keen on the black!

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