Date: Sun, 20 Sep 1998 20:30:56 GMT From: Ywan Mason <ymasonnopsamsouth.net> Subject: Re: 900T16S Intermittant Boost Problem
See http://www.townsendimports.com/turbo_folder/baseboostdia.htm A chattering APC solenoid is usually NOT indicative of a bad solenoid, the solenoid is only doing what it is told by the APC ECU from info from either the knock detector or the pressure transducer. The blue vacuum switch on the left fender has nothing to do with APC, it controls the upshift light on manual tranny 2.2 LH cars. A leak in it however, could lower boost levels. Never seen one leak however. The red capped switch there is a part of APC, it limits the boost to base levels when the cruise is engaged. Swapping the electrical connectors between the two switches will cause base boost only, but this would not be intermittent. Check the wiring to the APC solenoid. It is common for, it to loose its insulation and if the wires touch, the signal to the solenoid is lost. The solenoid needs power and ground to open to bleed boost from the compressor side of the turbo from the wastegate so the wastegate doesn't open and reduce boost.
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