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boosting but no power

Discussion in 'A4/S4 forum(B5 Chassis)' started by ALPINE, Oct 6, 2008.

  1. ALPINE

    ALPINE Yes its diesel, now cry u lost

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    AAAHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH CARS DOING MY HEAD IN NOW!!!!! got boost but car aint pulling! WHAT NOW????

    im gonna get the petrol and lighter out now!
     
  2. aragorn

    aragorn "Stick a V8 in it!"
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    when you say its boosting where are you measuring this? VAGCOM or some independant guage positioned somewhere?

    Could be a boost leak causing the engine to run very rich, that would produce boost but run like **** (and probably produce black smoke too)
     
  3. ALPINE

    ALPINE Yes its diesel, now cry u lost

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    boost gauge mate.. i can hear its boosting as it shwooshes through filter. i replaced the DV today and found a melted hose from n75 to turbo. (was to close to turbo) so replaced that also, cat see it being a boost leak as it would not boost up would it?? plus i have got good replacment hoses on the car now.
     
  4. aragorn

    aragorn "Stick a V8 in it!"
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    are you registering normal boost on the guage?

    if there was a boost leak you'd hear the turbo ssssssswwwhhhhhhhh'ing away and would register very little boost and it would be very down on power

    Isnt it a bit of a coincidence that just after messing with some boost hoses you now have no go?

    Best hoses in the world aint gonna work if they're not attached tightly...

    failing that i'd be looking at the pipework to and from the N75 seen as you say you've disturbed that today too...
     
  5. ALPINE

    ALPINE Yes its diesel, now cry u lost

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    checked all pipe work... its all on.. as is the n75. boost is reading normal. seriously.. im thinking of selling this fooking car now. time for that jap turbo i think!
     
  6. aragorn

    aragorn "Stick a V8 in it!"
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    whats vagcom saying?
     
  7. ALPINE

    ALPINE Yes its diesel, now cry u lost

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    no error codes mate


    edit... used my other vag com lead.. and got this...

    VAG-COM Version: Release 311.2-N
    Control Module Part Number: 8D0 907 557
    Component and/or Version: 1,8l R4/5VT MOTR HS D05
    Software Coding: 04001
    Work Shop Code: WSC 00000
    3 Faults Found:
    16500 - Engine Coolant Temp. Sensor (G62): Implausible Signal
    P0116 - 35-10 - - - Intermittent
    01262 - Solenoid Valve for Boost Pressure Control (N75)
    26-10 - Output Open - Intermittent
    16486 - Mass Air Flow Sensor (G70): Signal too Low
    P0102 - 35-10 - - - Intermittent


    all of which i have replaced appart from maf! :(
     
  8. Siena

    Siena Active Member

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    Alpine, you had power before though.

    When did you notice the drop in performance?

    Was it after you replaced the diverter valve?
    Was it pulling strongly with the melted N75 hose?

    Did the power loss come gradually?

    Just trying to work backwards from all the items you touched today.
     
  9. ALPINE

    ALPINE Yes its diesel, now cry u lost

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    Are these any good??

    http://cgi.ebay.co.uk/BRAND-NEW-AUDI-A4-1-8T-MASS-AIR-FLOW-MAF-SENSOR-95-ON_W0QQitemZ140273065743QQcmdZViewItem?hash=item140273065743&_trkparms=72%3A1348%7C39%3A2%7C66%3A2%7C65%3A12%7C240%3A1318&_trksid=p3286.c0.m14


    http://cgi.ebay.co.uk/BRAND-NEW-AUD...39:2|66:2|65:12|240:1318&_trksid=p3286.c0.m14

    Siena: power loss has been gradual since trip home from marks saturday, car went very jerky under boost when I hit M25 but I put it down to the little split boost pipe that comes from bottom of turbo, replaced that today when fitting new dump valve, power returned briefly before pretty much dissappearing altogether. It was heavily raining all the way home from marks, do u think that could have hurt the MAF?
     
  10. Oranoco

    Oranoco Well-Known Member

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    Mine was doing something very similar a while back. I got some electrical contact spray popped the filter off and soaked the MAF before leaving it to dry fully. Once back together the annoying boost but no power was gone and it hasn't returned.

    Stick with it mate, without the downs you can't appreciate the ups. And my mate found out the Jap stuff isn't without issues. £7k on Scoob and then £8k in repairs :(
     
  11. Andy.B

    Andy.B Member

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    As steve said Japs can be more grief the MR2 i had had a ceramic turbo shaft,and you cant have compressor stall in that at all or it snaps the shaft clean in two...

    I had loads of issues with my A4 since the ol turbo melted last year, since then i replaced almost everything and only now its boosting at 14psi. Perserver with it mate and it will get sorted these are like 10 year old cars now so things do brake and need fixing.

    Where about are you? I could plug my diagnostic handheld in and see whats up.. Worth a second opinion
     
  12. aragorn

    aragorn "Stick a V8 in it!"
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    i suggest you clear the fault codes and take it for a drive then see which return

    They could easily have been left over from a previous fault and are throwing you off the track...

    If those however are still there then they need fixing, it doesnt make up faults!
     
  13. docurley

    docurley Moderator
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    Alpine I don't have a spare as of yet but if you like I can hook up with you tomorrow if you want to try mine thats if it will fit.

    Take a look at your spark plugs just to see the state of them.
     

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