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Thread: Unsure of whats causing an issue (Hyundai)

  1. #11
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    Well the big issue is with it not showing any codes its not giving any clues to what the issue could be and I bought a code reader as when I got the car the check engine light was on and it needed an air flow meter and post cat lambda.

    As I suspected its probably ignition leads/coil pack or fuel filter, they are the only logical things it could be. Was hoping for a more informed opinion as there are some very experienced and good mechanical types on here (which I do feel I've got) feel free to throw some suggestions.

    One other thought I had was coolant temp sensor, the car gets to the halfway hot mark in less than a mile and is diabolical on fuel but this seems common from what I've read (only costs about £30-35 to fill up at 99.9p p/l so has a tiny tank) doesn't help that it has 113K miles on it, but hey its Korean and just a temporary run about, albeit an expensive one ffs

  2. #12
    Senior User mowgli's Avatar
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    Injectors need cleaning?

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    Thats the problem with reading codes to determine a fault.
    if the pre cat lambda was faulty the mixture would be false and therefore make the post cat lambda read out of range until it wrongly highlighted it was at fault. chances are it was probably ok and something else was influencing the mixture such as the MAF or the pre cat sensor, pin hole leak in the exhaust etc...

  4. #14
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    Sticking egr valve maybe

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    I think the filter is inside the tank, on the pump if I'm not mistaken.

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    Injectors is possible with it having over 113K miles on it. Meritlover I get what you're saying, after changing the AFM and post cat lambda (and clearing codes) it felt great but occasionally this weird thing would happen and its really starting to bug me what it could be

    Never thought about EGR, would it cause this kind of symptom? Shawn yeah guessing it must be in tank, been meaning to check it for ages

  7. #17
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    Egr will give similar symptoms
    not sure how difficult it is to remove on Hyundai s
    remove an soak it over night

  8. #18
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    Bigger issue at the moment, brake pedal hit the floor last night turns out the pipe that runs from the reservoir and through the suspension turret has cracked. Wonder if its anything to do with it running through the turret.

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