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HELP! I have no boost!

Discussion in 'A3/S3 Forum (8L Chassis)' started by Grant, Apr 3, 2005.

  1. Grant
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    Grant Well-Known Member VCDS Map User

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    [Apr 3, 2005]
    Was driving yesterday afternoon and went to overtake a car. I dropped a gear, pulled out and floored it and what happened next can open be described as hitting a brick wall!

    I immediately pulled over to the side of the road and tried pulling away again, but the car would not boost at all. Also, the idling was very lumpy.

    Plugged in VAG-COM and an error message of MAF sensor signal to high - Intermittent (or something like that) was recorded.

    On idle the engine seems like it wants to die. When I disconnect the MAF sensor it idles fine. I tried driving with the MAF disconnected but I'm still getting no boost. So off to Audi tomorrow to get a new MAF sensor, but I have no idea why I'm not getting any boost. Any ideas?

    Thanks
    Grant
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  2. PaulRS3
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    PaulRS3 Well-Known Member

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    [Apr 3, 2005]
    sure you not got a hose blown off?

    if it has you should be hearing the whine from the turbo

    id be checking around the hoses, onto the ICs etc.
    #2
  3. Ess_Three
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    Ess_Three Active Member

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    [Apr 3, 2005]
    I have had similar twice...

    Once was some form of very nasty limp mode...no boost at all until reset by VAG Com...

    The other was an IC hose blown off.

    If the engine is rocking hard on it's mounts at idle..it's likely to be the latter.

    What hapens is the MAF sees air entering, which is not translated to air seen by the engine...and it doesn't play ball...no boost, no idle etc.
    To prove...unplug the MAF...if the idle steadies out, but there is still no boost / power..you most likely have a hose off / burst.

    Under the hose off condition, mine would idle perfectly, pull smoothly - but with no power...and there was no whoosh of air as to indicate a split hose as indicated by many 'experts'.

    It's worth a go unplugging the MAF sensor to see if you can get any more info.

    BTW, the only error I had was a MAF related DTC too!

    The problem was found when the man from Audi fitted a new MAF and the problem remained.

    Best check, before you buy a new MAF!!
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  4. Ess_Three
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    Ess_Three Active Member

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    [Apr 3, 2005]
    [ QUOTE ]
    sure you not got a hose blown off?

    if it has you should be hearing the whine from the turbo


    [/ QUOTE ]

    I had no such noise on mine...absolutely nothing to indicate a hose off.

    Everyone said you will be able to hear the leak...but I couldn't.

    But, a hose off it was...drivers side IC outlet hose...
    #4
  5. PaulRS3
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    PaulRS3 Well-Known Member

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    [Apr 3, 2005]
    same here. both ends. fixed top one and fixed it so tight the other end blew off.

    doh.

    anyway swapped them out for Samcos and never had an issue since.

    noise was like an asmatic wheeeze which raised with revs. quite audible.
    #5
  6. Grant
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    Grant Well-Known Member VCDS Map User

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    [Apr 3, 2005]
    Thanks for the responses guys!

    I reset everything using VAG-COM and disconnected the MAF - car idles like it should but still no boost.

    I had an FMIC fitted a few weeks ago so I'll go have a closer look to see what I can see.

    I'll keep you posted!

    /ubbthreads/images/graemlins/beerchug.gif
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  7. Ess_Three
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    Ess_Three Active Member

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    [Apr 3, 2005]
    [ QUOTE ]

    I reset everything using VAG-COM and disconnected the MAF - car idles like it should but still no boost.


    [/ QUOTE ]

    Sounds familiar...


    [ QUOTE ]

    I had an FMIC fitted a few weeks ago so I'll go have a closer look to see what I can see.


    [/ QUOTE ]

    Check the hose where the air enters the FMIC...that's where mine went.

    Who's FMIC are you using?

    Star P's?

    If so, I'll bet that's where the hose has popped off...

    I would cancel the visit to Audi though...save yourself the time / money....I bet your MAF is fine.
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  8. Grant
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    Grant Well-Known Member VCDS Map User

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    [Apr 3, 2005]
    FMIC fitted at Star.

    I think I'll need to get some of those hi-strength jubilee clips you had Glen! Where did you get those from?
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  9. Grant
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    Grant Well-Known Member VCDS Map User

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    [Apr 3, 2005]
    Just had a look...

    The pipe for the FMIC has come loose... the pipe after the FMIC.

    Looks like a bumper off job for me tomorrow!

    Thanks again for your help!

    Grant
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  10. Grant
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    Grant Well-Known Member VCDS Map User

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    [Apr 5, 2005]
    *** UPDATE ***

    I took the bumper off last night and found the problem!

    The 45 degree elbow from the SMIC that connects to the 90 degree elbow into the FMIC had seperated.

    This is hardly surprising considering the company who fitted it, didn't even bother to replace the original jubilee clip which was all rusted! Disappointing!

    I took photos, so I'll get them posted soon!
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  11. dickys3
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    dickys3 Moderator Staff Member Moderator

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    [Apr 5, 2005]
    Glad you got it sorted mate! /ubbthreads/images/graemlins/beerchug.gif
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  12. marctwo
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    marctwo Member

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    [Nov 27, 2006]
    Had the same issue. No boost at all, although the car drove perfectly.

    Turned out that an air leek caused the turbo to overboost which eventually triggered some kind of limp mode and no boost at all. Symptoms where noticable increase in power (and air/turbo noise) followed by complete (and instantaneous) loss of boost several weeks later but no warnings on the dash.
    #12
  13. markyp2002
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    markyp2002 Member

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    [Nov 28, 2006]
    also, look at the pipes on the dump valve (situated top right hand corner just above the turbo). i replaced my OE dump valve today as the casing was split and causing me problems, and when i put the pipes back on, one of them came loose whilst i was driving, and "limp" isnt a strong enough word for what it felt like, more towards "held back by a jet engine".
    #13
  14. Defratos
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    Defratos You’re Dethpicable!!

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    [Nov 28, 2006]

    :jump::sign_pics: :jump::jump:ohh pics, I like pics, and pics of a FMIC ohh I love that, could I pwease pwease pwease see a pic of your FMIC with pipe work? I'm in the process of sorting mine out.
    #14
  15. rraghvani
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    rraghvani Whoever does not try, does not learn.

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    [Nov 29, 2006]
    I’m having similar problems too with no boost. Revo found out I had problems with my MAF which they reset. I’ve now got the engine management light on! I need to get my car diagnosed to find out what the exact problem is, would Audi charge for this?
    #15
  16. rickparmar
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    rickparmar va va voom

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    [Nov 29, 2006]
    april 2005 this thread started wow
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  17. markyp2002
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    markyp2002 Member

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    [Nov 29, 2006]
    read back to what i said previously in my post on this thread, i mentioned about the dump valve having hairline cracked on the casing was giving false readings between the MAF and the sensor that follows the dump valve.

    check the pipes, fittings and the dump valve (best way to check it, take it off and blow into the holes - if u hear air coming out its broken)
    #17
  18. Defratos
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    Defratos You’re Dethpicable!!

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    [Nov 29, 2006]
    well spotted :hubbahubba:
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  19. rraghvani
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    rraghvani Whoever does not try, does not learn.

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    [Nov 30, 2006]
    I'll check all pipes, valves and stuff
    #19
  20. rraghvani
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    rraghvani Whoever does not try, does not learn.

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    [Dec 11, 2006]
    Since the weather change, my turbo now seems to work all the time! Could this be due the MAF being dirty / clogged up?
    #20

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