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900 APC
Posted by suthie99 - http://saabnet.com/tsn/forms/e.php3?em= (more from suthie99 - http://saabnet.com/tsn/forms/e.php3?em=) on Fri, 28 Mar 2003 16:44:38
In Reply to: , Kok Chen, Sat, 17 Dec 1988 12:00:00

I have an '87 900T that is only achieving base boost. I have tried many
diagnostic tests and have yet to find any faults. My latest effort has been
connecting a test circuit (bulb) in parallel to the solenoid to give me some
idea of what is happening while I'm driving. The bulb is flashing and fully
cutting out before it even reaches the early orange on the boost gauge. It
doesn't seem to be directly related to the revs - if revving in neutral it
will get to 4000 before the test bulb starts flashing. It seems to be worse
when the engine is under load, the APC will flash at 1800 rpm when
accelerating up hill. It has shown that the vacuum switch and brake signal
are doing what they should. They MAP sensor has been checked and an exchange
unit trialed. I have even tried an APC box out of a '87 9000T that is
performing normally with no improvement.

I guess I'm thinking along the lines of there being some genuine knock that
is showing up when the engine is under load. Does anyone have any comments or
suggestions? Thanks again in advance.

James
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