Results 1 to 14 of 14
  1. #1
    Join Date
    Aug 2006
    Location
    Buenos Aires, Argentina.
    Posts
    85
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Rides
    0

    Default Help with absolute pressure sensor connection

    Hello guys,

    First of all, hope you all have enjoyed X-mas and started 2012 at the top!
    After almost 5 years, since I bought my loved Q4, I decided to make some "surgery" because there was a fuel leak at the more undesired place, the hose under the air mainifold (yes that one that goes to the fuel pressure regulator), then I had to unmount the manifold and other stuff.
    Everything was fine until I faced with the absolute pressure sensor hose, I can't find the place where it should be connected from the manifold side.
    The manual is not clear just says "disconnect the hose" and the drawing is not complete.
    Sorry for this "newbbie" question but, I'm an IT security specialist, playing with "macchine Italiane" and I don't know too much!
    Thanks for the help.

    -Dario.
    Nobody tell me to stop...

  2. #2
    mpampis_'s Avatar
    mpampis_ is offline Running smoothly
    OP of the best thread of the year 2012
    Best Modified car of the year 2012
    Join Date
    Jan 2010
    Location
    greece
    Posts
    487
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Rides
    0

    Default

    The hose of the map sensor is going in the middle, under the inlet manifold

  3. #3
    mpampis_'s Avatar
    mpampis_ is offline Running smoothly
    OP of the best thread of the year 2012
    Best Modified car of the year 2012
    Join Date
    Jan 2010
    Location
    greece
    Posts
    487
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Rides
    0

    Default

    As you see in my signature photo it beside the 2 bolts of the manifold, under these

  4. #4
    Join Date
    Aug 2006
    Location
    Buenos Aires, Argentina.
    Posts
    85
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Rides
    0

    Default

    Quote Originally Posted by mpampis_ View Post
    As you see in my signature photo it beside the 2 bolts of the manifold, under these
    Yes, I found it this morning.
    When I've unmounted the manifold, I've disconnected the hose from the intake manifold instead of sensor side and forgot the right place.
    Thanks mpampis for your help!

    -Dario.
    Nobody tell me to stop...

  5. #5
    Join Date
    Jun 2006
    Location
    London
    Posts
    2,677
    Mentioned
    9 Post(s)
    Tagged
    0 Thread(s)
    Rides
    1

    Default

    Difficult one to locate.
    A garage once left it disconnected on mine and led to an interesting drive home after they had closed for the night!

  6. #6
    Join Date
    Apr 2006
    Location
    Bournemouth UK
    Posts
    4,782
    Mentioned
    2 Post(s)
    Tagged
    1 Thread(s)
    Rides
    1

    Default

    Didn't have time to stick these up this morning, but better late than never. Hopefully they will help anyone else who needs to know where it is connected.

    As you can see, its a real bitch of a place to get to if you need to reconnect it with the inlet manifold in place.



    1994 Alfa Romeo 155 Q4: Dozeing in the garage.
    2009 Audi A4 tdi: Everyday drive.
    1994 Alfa Romeo 155 , 1995cc Std Standard Black

  7. #7
    Join Date
    Aug 2006
    Location
    Buenos Aires, Argentina.
    Posts
    85
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Rides
    0

    Default

    Quote Originally Posted by AlfaJack View Post
    Difficult one to locate.
    A garage once left it disconnected on mine and led to an interesting drive home after they had closed for the night!
    Ooops! and what was the car behavior with the hose disconnected?
    Just to keep in mind.
    Nobody tell me to stop...

  8. #8
    Join Date
    Aug 2006
    Location
    Buenos Aires, Argentina.
    Posts
    85
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Rides
    0

    Default

    Quote Originally Posted by Steve Webb View Post
    Didn't have time to stick these up this morning, but better late than never. Hopefully they will help anyone else who needs to know where it is connected.

    As you can see, its a real bitch of a place to get to if you need to reconnect it with the inlet manifold in place.



    Steve,

    Thanks for the pictures.
    Next time I'll remove the hose from sensor side!

    -Dario.
    Nobody tell me to stop...

  9. #9
    Join Date
    Jun 2006
    Location
    London
    Posts
    2,677
    Mentioned
    9 Post(s)
    Tagged
    0 Thread(s)
    Rides
    1

    Default

    Quote Originally Posted by alfista_AR View Post
    Ooops! and what was the car behavior with the hose disconnected?
    Just to keep in mind.
    It hugely over fuels!

  10. #10
    Join Date
    Apr 2006
    Location
    Bournemouth UK
    Posts
    4,782
    Mentioned
    2 Post(s)
    Tagged
    1 Thread(s)
    Rides
    1

    Default

    Quote Originally Posted by AlfaJack View Post
    It hugely over fuels!
    Are you sure thats right? Surely if the car is making any boost at all the MAP sensor is only going to see atmospheric pressure (as if the car wasn't making boost) and not add enough fuel.
    But then again the MAP sensor is not going to see any vacuum either, so I guess the car is going to be both over and under fuelling depending on what your right foot is doing.

    I had the hose to the MAP sensor come adrift once, the car seemed to run fine on very light throttle, but under boost it coughed like a 60 a day smoker.
    1994 Alfa Romeo 155 Q4: Dozeing in the garage.
    2009 Audi A4 tdi: Everyday drive.
    1994 Alfa Romeo 155 , 1995cc Std Standard Black

  11. #11
    Join Date
    Jun 2006
    Location
    London
    Posts
    2,677
    Mentioned
    9 Post(s)
    Tagged
    0 Thread(s)
    Rides
    1

    Default

    I thought it was. Had a sooty exhaust pipe IIRC...ran like a dog when giving it a bit of poke..

  12. #12
    Join Date
    Apr 2006
    Location
    Bournemouth UK
    Posts
    4,782
    Mentioned
    2 Post(s)
    Tagged
    1 Thread(s)
    Rides
    1

    Default

    Were you driving back through London when it happened? (i.e. crawling along) if so I guess it wasn't registering the vacuum so over fueling. I had to come back along the M11, which was interesting!
    1994 Alfa Romeo 155 Q4: Dozeing in the garage.
    2009 Audi A4 tdi: Everyday drive.
    1994 Alfa Romeo 155 , 1995cc Std Standard Black

  13. #13
    Join Date
    Jun 2006
    Location
    London
    Posts
    2,677
    Mentioned
    9 Post(s)
    Tagged
    0 Thread(s)
    Rides
    1

    Default

    Quote Originally Posted by Steve Webb View Post
    Were you driving back through London when it happened? (i.e. crawling along) if so I guess it wasn't registering the vacuum so over fueling. I had to come back along the M11, which was interesting!
    Yes back from the guy that took over the Evo Eng' garage...

  14. #14
    Join Date
    Apr 2006
    Location
    Bournemouth UK
    Posts
    4,782
    Mentioned
    2 Post(s)
    Tagged
    1 Thread(s)
    Rides
    1

    Default

    I remember that trip,getting through Catford used to take ages!
    1994 Alfa Romeo 155 Q4: Dozeing in the garage.
    2009 Audi A4 tdi: Everyday drive.
    1994 Alfa Romeo 155 , 1995cc Std Standard Black

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •