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Thread: Engine Fault

  1. #1
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    Default Engine Fault

    My wife took the A4 1.8T 2000 for a drive last week to Wollongong to do some shopping. As she was leaving she called and said the car was shaking/shuddering during idle and then the car had no power above 60klms/hr.
    I eventually towed car home. Finally got time today to do a scan:


    Any help would be greatly appreciated.

    Cheers
    Senad


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  2. #2
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    Quote Originally Posted by WollongongA4B5 View Post
    My wife took the A4 1.8T 2000 for a drive last week to Wollongong to do some shopping. As she was leaving she called and said the car was shaking/shuddering during idle and then the car had no power above 60klms/hr.
    I eventually towed car home. Finally got time today to do a scan:


    Any help would be greatly appreciated.

    Cheers
    Senad


    Sent from my iPhone using Tapatalk
    Looks like 02 sensor is faulty (for air fuel ratio)


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  3. The Following User Says Thank You to jaydece For This Useful Post:

    WollongongA4B5 (December 6th, 2018)

  4. #3

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    I don't think O2 sensor. That's normally code 00525. More likely a vacuum leak messing with the MAF or failing MAF. Could also be fuel related dying fuel pump, blocked filter, something resulting in low fuel pressure. Need to check fuel pressure.

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    WollongongA4B5 (December 6th, 2018)

  6. #4
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    Quote Originally Posted by jsol View Post
    I don't think O2 sensor. That's normally code 00525. More likely a vacuum leak messing with the MAF or failing MAF. Could also be fuel related dying fuel pump, blocked filter, something resulting in low fuel pressure. Need to check fuel pressure.
    I did a service recently but didnít get to replacing fuel filter, Iíll replace fuel filter tomorrow and then see about checking fuel pressure.



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  7. #5

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    thats lean missfire.
    not enough fuel (o2 is working or it wouldnt know this).
    big vac leak on manifold will do this, - but will also cause rich at accel- heavy load cruise and not complete lack of power (so this rules out vac leak)
    maf reading poor- unplug and runs better will also point to maf (not always the case- as a bad air leak will run better with maf unplugged) but its not a (vac) leak as found out before

    so maf or poor fuel pressure it is- just like jsol says
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    WollongongA4B5 (December 7th, 2018)

  9. #6
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    Quote Originally Posted by rockersteady View Post
    thats lean missfire.
    not enough fuel (o2 is working or it wouldnt know this).
    big vac leak on manifold will do this, - but will also cause rich at accel- heavy load cruise and not complete lack of power (so this rules out vac leak)
    maf reading poor- unplug and runs better will also point to maf (not always the case- as a bad air leak will run better with maf unplugged) but its not a (vac) leak as found out before

    so maf or poor fuel pressure it is- just like jsol says
    Hi Ed,
    I replaced the maf with the one out of my 97 A4 today (cleaned it with maf cleaner first) and started her up and ran with no problems.
    Iíll take it for a drive tomorrow and see how it goes, as you and jsol have said it looks more likely a failed maf sensor.

    Thanks for the advice.


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  10. #7

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    Ed, you're a troubleshooting demon. I had it narrowed down but didn't consider the running rich on load to eliminate vac leak.

  11. #8

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    OP, glad you got it sorted.

  12. The Following User Says Thank You to jsol For This Useful Post:

    WollongongA4B5 (December 8th, 2018)

  13. #9
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    Fixed the faulty maf sensor. Now I have another problem thatís come up, I havenít scanned it as I donít know if a code will come up.
    When Iím driving with the air/con on and Iím coming to a stop with the clutch in the car wants to stall. Revs drop down then come back up again. I turn the air/con off and I have no problems.
    Could it maybe be a sensor ?


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  14. #10

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    I would physically check the aircon pulley/belt. If the bearings are shot the compressor it would be generating a lot of drag on the system. DBW cars utilize the ecu to step up the revs when the air con is switched on I think? Did you disturb the TB? It might need a clean or TBA.

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