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Fitted new standard DV now car unhappy

Discussion in 'A3/S3 Forum (8L Chassis)' started by lol4fun, Feb 12, 2014.

  1. lol4fun
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    lol4fun Member

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    [Feb 12, 2014]
    Hi, I got a standard DV from my local vw garage today and promptly replaced my leaky forge split r but on the drive back the car seems to be surging or if you let off a little it jolts, the car was quite smooth with the forge on but not so much. I've changed the dog bone mount so its not that.
    It also pops when you blip the throttle and the engine almost dies when you pull up to a stop or rev it then let the revs settle.

    Help :( lol
    #1
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  3. <tuffty/>
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    <tuffty/> Badger 5 Edition Staff Member Moderator

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    [Feb 12, 2014]
    Got a big leak somewhere I suspect...

    <tuffty/>
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  4. lol4fun
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    lol4fun Member

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    [Feb 12, 2014]
    Chance the brand new dv could be faulty?

    Attached pic so people know the part number.
    [​IMG]
    #3
  5. s3joe
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    s3joe Member

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    [Feb 12, 2014]
    Might be a stupid one but have you put it on the rite way
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  6. lol4fun
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    lol4fun Member

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    [Feb 12, 2014]
    I think so, high pressure side going into the side of the valve and vacuum pipe on top
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  7. <tuffty/>
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    <tuffty/> Badger 5 Edition Staff Member Moderator

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    [Feb 12, 2014]
    The other thing it could be is the split-r had a big enough leak that the adaptions are out of whack... the ecu takes a little while to re-adjust... if you have VCDS you could check for fault codes just in cas, copy them to notepad then reset them... it will reset the fuel trims and may fix the issue

    <tuffty/>
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  8. s3joe
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    s3joe Member

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    [Feb 12, 2014]
    Turn it around than and see what happens
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  9. <tuffty/>
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    <tuffty/> Badger 5 Edition Staff Member Moderator

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    [Feb 12, 2014]
    The OE DV doesn't fit the same way the split-r does... bottom (opposite of the small vacuum inlet) goes into the TIP and boost goes into the side

    <tuffty/>
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  10. lol4fun
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    lol4fun Member

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    [Feb 12, 2014]
    I thought that and did wonder if the car made compensations for leaks etc, any way to reset this without a vcds? I bought a cheap one off eBay but it didn't work surprise surprise. Probably the first time in years the car has had no vacuum leaks as I've replaced all the small vacuum pipes with silicone ones because they just crumbled when touched
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  11. lol4fun
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    lol4fun Member

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    [Feb 20, 2014]
    Car is now happier but not perfect, still almost dies and revs up and down after a battering or coming up to a roundabout
    #10
  12. russwuss
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    russwuss Active Member

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    [Feb 20, 2014]
    you have anyone local that would lend you a MAF sensor? could give that a try...
    #11

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