Re: Low boost problems -- at wits end -- HELP!

["Doyt W. Echelberger" <Doyt@nwonline.net>]

>In-Reply-To: <199907080155.VAA04933@euler.adams.com>
>
>On my 87 5kcstq, I found a severe leak in the very short 6 inch vacuum
hose between the wastegate housing and the intake manifold. This is _not_
one of the two easily visible hoses you mention in your posting. This short
hose is hidden until you remove the washer fluid bottle.
>
>My hose was fabric covered, and appeared good on visual inspection. I
pinched the hose between my fingers and thumb all along its length, and
discovered that the rubber walls under the fabric had hardened and
crumbled, and that the engine vacuum had sucked the crumbled rubber into
the engine, leaving nothing but the intact fabric cover.
>
>If you have not examined this hose, do so, for it is a potential cause of
your problem.
>
>Doyt Echelberger
>86 4kq
>87 5kcstq
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>.
>
>
>At 09:55 PM 7/7/1999 -0400, you wrote:
>>
>>Gurus:
>>
>>I recently purchased an '87 5KTQ ..........snip...........
 the car
>>suffers from low boost, which maxes out at 1.1 bar according to
>>in-dash pressure gauge.............snip....
>> 6) Vacuum/Boost leak in hoses?
>>
>>    Connected vacuum pump to two rubber hoses at rear of intake
>>    manifold distribution pipe.  Both hoses held 20 in Hg vacuum.
>>    Vacuum in one hose caused pressure gauge to read 0.2 bar.
>>    Ergo: No leak here.
>>
>> 7) Problem in Turbo or plumbing?
>>
>>    I removed turbo cold side intake and turbo exhaust hoses.  Hoses
>>    were solid and had no internal obstructions.  No play was
>>    noticable in turbo rotors on the axis.  A significant improvement
>>    in performance was observed when Michelin-man hose was replaced
>>    and boost comes up quicky.  Ergo:  All is well?
>>
>>
>>I would really appreciate any feedback.  What did I miss?  Where did
>>I over-interpret?  What next?
>>
>>Thanks in advance and thank you very much Scott Mockry!
>>
>>Gisli
>>
>>
>>
>>Gisli Ottarsson, PhD                     
>>Mechanical Dynamics Inc.            gisli@adams.com    
>>2301 Commonwealth Blvd.             Tel: 1-734-913-2550
>>Ann Arbor, Michigan 48105           Fax: 1-734-994-6418
>>
>>
>>
>>
>>