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Date: Wed, 16 Sep 1998 13:31:57 GMT
From: <jvanabranopsamnet> wrote:

>Paul Aspinall wrote:
>> 
>> I have an 89 9000 Carlsson. I have had problems with Turbo boost for a few
>> months now. The car seems to imtermittently reduce itself to basic boost for
>> no reason (ie. the boost guage moves half-way into the yellow).
>> Occassionally I do get full boost (all the way into the yellow), but it is
>> quite rare.
>> 
>> I have changed plugs, air filter, cleaned injectors, tried new boost
>> solenoid - but no luck.
>> 
>> Has anyone had this problem, or can anyone help???
>> 
>> Thanks
>
>
>Did you try a new APC box?  That would be the next place to
>look.  Either than or a vacuum leak.
>
>The APC box is the *sole* controller for boost.  It interacts
>directly with the APC solenoid, so if you're getting basic
>boost, it's 'cause the APC box said so - given that the
>solenoid itself is good.
>
>Now, things that will normally cause basic boost are a
>failed apc box, a failed knock sensor (may give the
>*illusion* of basic boost) or the cruise control system
>being engaged or malfunctioning (check the pop-off valve
>near, the clutch & brake pressure switches, and the
>cruise control 'ecu' itself).  
>
>My money is on a bad APC box, though.
>
>-Justin

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