Author Topic: No vacuum?  (Read 2055 times)

ross_jsy

  • 170BHP Member
  • ***
  • Posts: 61
    • View Profile
No vacuum?
« on: 17:46, Mon 26 May 2008 »
was trying to find out why the bov wasnt.....erm boving.

after inspecting diaphram all was ok so got a friend to bring a boost guage round that measures pos and neg boost. first we hooked it up to where previous owner had installed a guage using a T piece off the hose which drives standard guage. was reading positive fine but no neg. we then ran it directly where the bovs vacuum hose plugs into and again, no negative. we tried it on 2 guages but had same result.

so any idea's why i have no vacuum?

cheers

5teve L

  • Global Moderator
  • 200BHP Senior Member
  • *****
  • Posts: 3540
    • View Profile
(No subject)
« Reply #1 on: 18:11, Mon 26 May 2008 »
The line from the carb top will only see + pressure.
The line that goes from the carb base/inlet manifold to the AEI (or as some call ecu) reads + & - pressure, is it t'd into this ??

ross_jsy

  • 170BHP Member
  • ***
  • Posts: 61
    • View Profile
(No subject)
« Reply #2 on: 18:16, Mon 26 May 2008 »
its T'ed to one of the lines going to the actuator, which goes to base of the carb so should be reading -ve

5teve L

  • Global Moderator
  • 200BHP Senior Member
  • *****
  • Posts: 3540
    • View Profile
(No subject)
« Reply #3 on: 23:01, Mon 26 May 2008 »
It won't read neg from that line ;) + only, it needs to T into the line from right at the bottom of the carb/inlet manifold, it goes off to the black box (AEI) either above the turbo (ph 1-1.5) or in the scuttle area on the pass side (ph 2)

Boost gauge & D/V .

Steve

ross_jsy

  • 170BHP Member
  • ***
  • Posts: 61
    • View Profile
(No subject)
« Reply #4 on: 23:45, Mon 26 May 2008 »
aha! this wil solve everything then! wonder why was plumbed in this way in the first place then :?

will give it a whirl tomorrow!

cheers

5teve L

  • Global Moderator
  • 200BHP Senior Member
  • *****
  • Posts: 3540
    • View Profile
(No subject)
« Reply #5 on: 09:27, Tue 27 May 2008 »
Because some people forget what hoses go where :)

ross_jsy

  • 170BHP Member
  • ***
  • Posts: 61
    • View Profile
(No subject)
« Reply #6 on: 17:34, Tue 27 May 2008 »
brilliant! she is now sucking and sneezing like a hooker with a cold

5teve L

  • Global Moderator
  • 200BHP Senior Member
  • *****
  • Posts: 3540
    • View Profile
(No subject)
« Reply #7 on: 18:04, Tue 27 May 2008 »
Glad you sorted it :)

Steve

Ash-Lee

  • Global Moderator
  • 200BHP Senior Member
  • *****
  • Posts: 4208
    • View Profile
(No subject)
« Reply #8 on: 00:36, Wed 28 May 2008 »
Quote from: "ross_jsy"
brilliant! she is now sucking and sneezing like a hooker with a cold


HAHA!  :lol:  :lol: