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Engine 'judder' / hesitate on acceleration. help!

Discussion in 'Classic Audi Forum' started by sc_001, Jul 29, 2010.

  1. sc_001
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    sc_001 New Member

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    [Jul 29, 2010]
    Hello, I have a 1994 audi 80 sport, engine code ABK. & I have this problem.

    The engine hesitates/judders on acceleration, at high revs it has no power, at low revs it judders & hesitates intermtantly. It feels like a diesel vehicle in the winter when the fuel 'jelly's-up'.

    I recently changed the engine & that is when the fault started, so I'm pretty sure that its electrical. my new engine is exactly the same (ABK) but is from an L reg audi 100, my car is an M.

    I kept the injection manifold & airbox to comply with my cars wiring & plumbing.

    I have changed the temp* sensors & MAF sensor, the temp* guage does'nt work but it never did.

    The 'cat' rattles so does anyone know if a damaged catalyst would cause this problem.

    I am fairly certain that it is electrical becouse sometimes its fine.

    Any help or advice would be greatly appreciated.
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  3. Blackie_No1
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    Blackie_No1 New Member

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    [Aug 3, 2010]
    Im not too hot on the SPORT models, but do they have a dizzy? if so have you checked the cap and rotor arm? Have you checked the Hall effect module?
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  4. sc_001
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    sc_001 New Member

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    [Aug 4, 2010]
    No idea what the hall effect module is, but I'll soon find out. It has a new distributer cap & leads. Thanks for your response.
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  5. Blackie_No1
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    Blackie_No1 New Member

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    [Aug 4, 2010]
    the hall effect module is a little box at the side of the distributor, or atthe other end of the wiring loom from the distributor
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  6. sc_001
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    sc_001 New Member

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    [Aug 12, 2010]
    Thanks for that but the hall effect module is on the car & it was working fine with the old engine so its not the problem. I'm decating, changing the exaust boxed (they all rattle) & leaving the lambda probe disconnected. I suspect that the old leaky & rattle exaust may be confusing it, & if it is'nt it needed doing anyway.
    #5
  7. sc_001
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    sc_001 New Member

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    [Aug 29, 2010]
    Proplems sorted!

    I snipped the lambda probe wires, took off the cat & dug all the stuff out of it, & put it back on.

    I guess it was the lambda sensor all along.
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  8. elijah
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    elijah New Member

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    [Sep 21, 2010]
    It is also my first time hearing this "Hall Effect Module" but now I know what it is. My friend was asking me about this hall effect module because his car had a problem and his neighbor said that it is probably something to do with the hall effect module but I also don't know that time when my friend ask me. Now, I can tell him what and where it is. Thanks for sharing the info.
    #7

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