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HELP Miss firing/loss of powere/rough A4 1.8t 190 Bex engine

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by dlhudson39, Aug 12, 2013.

  1. dlhudson39
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    dlhudson39 New Member

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    Hi Please Help
    Lets start with the simple stuff.
    I have a UK Audi A4 (190 6speed Manual) 1.8t B6 year 2004 BEX engine.
    I had the engine light come on with the code for lean bank 1. The only code that has come up on my laptop reader. I consider my self good at fault finding, but this is starting to wind me up now.

    So i went through the following to iron out that fault.
    1. Oil (Audi equiv) & Filter change.
    2: New Bosch super4 spark plugs x4.
    3: New set of Coil Packs x 4.
    4: Replaced the PCV Valvle & attached 3 way hose for good messure.
    5: Ran tank dry and filled up and used Redex fuel system cleaner.
    6: Cleaned Air mass housing and grill. Replaced Air flow Mass meter. (OEM Equiv)

    Cleared the code yet still runs miss firing and top end speed very poor.
    Using alot of fuel due to running rough too.

    So i replace the spark plugs with Bosch again.
    Checked they all were firing, which they were.
    All coils firing and in firmly.
    Put old air flow meter back in & it ran very rough, so knew the new one
    was ok. So put back in. Reset all codes & went off again.

    It still is very rough yet no engine light yet.
    Any help please?????!!!!!!
    Cheers
    Danny
    Kent UK
    #1
  2. mikeygulley
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    mikeygulley Member

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    I'm more used to working on Pugs but what about the Lambda? try unplugging it and see if it runs any better.
    #2
  3. Slinepete
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    Slinepete Member

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    Wouldn't cause a misfire but have you changed the crankase breather valve are the plugs gapped correctly long shot but you never know I have the same engine when I had similar probs I changed coil packs and breather valve
    #3
  4. Andie0
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    Andie0 Member

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    Are all your injectors clipped in correctly to the connectors, i had a misfire and was one of the injector harness wasnt clicked in correctly!
    #4
  5. dlhudson39
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    dlhudson39 New Member

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    cheers guys :)
    i will check injectors clipped in, but feel they are clipped in.
    2 stes of bosch super 4s put in and same problem.
    replaced the pcv valve as was leakinh & hissing.
    Is the crankcase breather valve the same as pcv at rear of engine?
    more helpplease
    Danny
    #5
  6. Slinepete
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    Slinepete Member

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    https://www.google.co.uk/search?q=c...AA&biw=1024&bih=672#biv=i|1;d|k2TfbPI4OAyHPM: not sure if that'll work it's the small thing with little plastic disc inside that's the bit that will be broken,the whole thing sits inside a big t piece under the manifold a bit further down I got to it by removing washer bottle and could just get my arm in best bet is to do a search I found some pics that were helpful when I did it
    #6
  7. Slinepete
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    Slinepete Member

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    Intact that link has the guide on it
    #7
  8. madmike01uk
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    madmike01uk Member

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    have you checked the coil pack wiring, this wiring can often split causing a missfire.
    #8
  9. Innocence80
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    Innocence80 Member

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    My first thought was a dud injector, I had this on an old saab convertible, not code came up for it, changed coil packs, spark plugs and was still running rough with a mis fire. Did some playing about with the injectors and bingo faulty injector.
    #9
  10. dlhudson39
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    dlhudson39 New Member

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    Thanks guys
    followed all the breather pipes with LED torch.
    Culprit was a big slit 3way hose under manifold.
    Have order part as i could still read the part number :)
    Also just need part numbers for either side to replace for good measure.
    Saved myself alot of money, just time to fix it.
    Any step by step guides to follow out there.
    Thanks again all, great forrum & great help
    Danny
    PS all injectors sitting nicely with all clips tight :)
    Last edited: Aug 13, 2013
    #10
  11. Andie0
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    Andie0 Member

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    Good the guys on here are a good lot and always happy to help
    #11
  12. Slinepete
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    Slinepete Member

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    Follow the link I posted earlier for the breather valve it sits inside that 3 way pipe your talking about that should show you glad you've found it matey
    #12
  13. dlhudson39
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    dlhudson39 New Member

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    Hi Guys

    Right i thought i solved it.
    I replaced the faulty split Vac 3way hose and the broken valve inside.
    Then replaced the down Vac pipe to the engine block. Which was amazingly tricky to remove.
    As like everyone says, it breaks off.

    2.5hrs later all nice new pipes fixed in & re-clipped in.
    Reset engine management code.
    Engine hissing is considerable less. I thought....yes get all that smooth turbo power back.

    But now driving is still terrible, the loss of power is quite significant.
    Top end speed is massivly less & struggles to accelerate on the hills.

    Before all this & the engine light coming on, the cars performance was awesome.
    But after finding the split vac hose, replacing 2x faulty breather valve, replacing all coil packs, 2 lots of bosch super4 spark
    plugs tried, oil & filter change. Im pulling my hair out.
    It isnt jumping or jerking, just real loss of power or even turbo boost.

    Questions & support please all.
    1: Could it be faulty coil pack leads, yet no engine management light yet.
    2: How can i check if its the turbo, would that come up on engine fault light.
    3: What are my other options to check & iron out please.

    Cheers
    Danny
    #13

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