Missing Boost, 90 200q

[Ameer Antar]

not sure about how the controller interfaces w/ the ECU, etc., but what 
about intake temp sensor? How does the ECU not cutoff fuel after you reach 
a cerrain level of boost?

-ameer


At 03:50 PM 12/10/2000 , you wrote:
>Thought I would give the collective wisdom one more try, my 200 is again
>back to 1.7bar max, and at high rpm that drops off to 1.5b, I'm sure it
>is caused by something silly since the condition comes and goes.
>When the boost is "controlled" it can be set for say 1.9b, gets there
>very quick and will stay there to 6000rpm.
>Now it only gets to 1.7b, even with the tube to the wg clamped off!
>There are no noises, no driveability problems, idle is fine etc.
>I wondered about the controlled purge cycle and tried clamping off the
>other hoses, but could not locate anything that effected the problem.
>Has happened 4 times or so now in last 3 months, ie it has returned to
>1.9bar without me knowingly doing anything.
>As  it is now there is still a noticeable rush in 2nd gear, but in third
>its seems quicker to upshift to 4th arond 4500.
>I expect the motor will last longer as it is now, but will happily trade
>that risk for the higher boost.
>A reminder, my boost controller is manual,WOT switches etc not involved,
>will go to 1.9bar at 1/4 throttle!
>Any ideas???
>         Trevor Topley