RE: High boost problems on '91 200QW (3B)-advice?

[Phil Rose <pjrose@servtech.com>]

>Date: Wed, 19 May 1999 12:14:33 -0700 (PDT)
>From: "James A. Desveaux" <desveaux@ucla.edu>
>Subject: RE: High boost problems on '91 200QW (3B)-advice?
>
>Over the past few days, I've encountered some boost problems.  I first
>noticed this on a steep grade in the Oakland hills last week.  I had the car
>in 3rd gear, above 2000rpm, and the car began to buck a bit.  Downshifting
>to 2nd helped.  Previous to this incident, the car would've pulled through
>the rpms just fine, especially since I changed the turbo bypass valve last
>fall.  On the way back to LA last night, I wanted to make sure there was a
>problem.  On the Ventura grade, I slowed to about 55mph in 5th, and then
>attempted to accelerate rapidly up the grade.  THe boost gauge went up to
>1.7 bar, and then 1.8 bar for an instant, but with difficulty.  THe car
>again started to buck, and I backed off, and downshifted.  I've done with
>grade, and the gauge has gone to 1.8 bar easily, and on a couple of
>occasions, 1.9bar.  It has a mild IA chip that the previous owner had
>installed a few years ago.

[snip]

> Today I checked the lower high pressure boost hose,
>and the upper one.  Both appear to be in very good condition, with no cracks
>or holes.

James,
Could be lots of things, including fuel, but do recheck all manifold (IM)
hose clamps! Recently I had a loose clamp (don't ask why!) at the hose
connecting the pressure pipe to throttle body, which produced similar
symptoms to what you described. There are many smaller hoses around the
throttle which could be losing pressure at high boost--including ISV hoses.



Phil Rose				Rochester, NY
'91 200q				mailto:pjrose@servtech.com
'89 100