Badger5Monster Motorsport
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  1. #1
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    04 1.8T engine management light on! Advice please

    My girlfirend has a 1.8T 04 plate A4 cab. she started it the other day and the engine management light came on and it started to run lumpy, as in sounding like it was a cylinder down. I have checked the core/coil plugs and found that the number 1 cylinder wasnt working. i have replaced with a genuine VAG part and it has sorted the issue, as in all of the cylinders appear now to be working and when you remove all of the the core plugs you can see it sparking and hear them clicking etc. however it is still running very lumpy when idling. It appears to cure when you give it some revs partly. Any ideas?

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  3. #2
    AU01 A4's Avatar
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    Crank Brather vale there a lot of threads on here about it
    Audi A4 1.8T quattro S Line Avant

  4. #3
    AU01 A4's Avatar
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    here you go just get it scaned fist and post up the results
    Running Lean and bad Idle problems after remap
    Audi A4 1.8T quattro S Line Avant

  5. #4
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    cheers, gives me a place to start looking. I'll get it scanned.

  6. #5
    1st Gear

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    Poor idle can be from any of the following:

    MAF, Ignition Coil, Spark Plug, VAC Leak, O2 Sensor, Throttle Body or Temp sender.

    Cleaning the TB is a cheap an easy place to start.
    Unplugging the MAF tests if the MAF is faulty
    Temp sender / o2 sensor you'll need to do a scan.
    Vac leak, look for split hoses or data logging using vag com

    Not sure if the 3 older coil packs are weaker in any way and could make a difference?

  7. #6
    CHRIS555's Avatar
    DOPE with added OCD

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    Crankcase breather valve for sure - let ne kniw if you need the part numbers etc, its a 6 part and a DIY job

  8. #7
    itsmeagain's Avatar
    1.8T Sport Cabriolet

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    I had the same problem on my cab, I replaced the valve and it cured the problem. Easy job to do
    Audi A4 1.8t sport convertible, Full Grey Leather Interior, Ambient Light Pack, Polished Forge FMCL007P Diverter valve, Green Cotton Filter, 100mm Tail pipes, Rear RS4 ARB, Interior Xenon White LED's bulbs, Xenon White LED number plate bulbs and side lights, JBS Auto Designs stage 1 remap, RNS-E and OEM Bluetooth, Remote roof module, OEM Wind Deflector, B7 rear lights, HID lights.

 

 

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