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Common problem
Posted by Robert Davis (more from Robert Davis) on Tue, 12 Dec 2000 09:55:06
In Reply to: Drop in boost on '97 Aero, Zip, Tue, 12 Dec 2000 09:34:25
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The culprit is likely the BPC solenoid, located on the fan shroud, which has one electrical and three vacuum ports on it. You'll likely need to replace it, and since they are $210 in the U.S. for a new one it might be a good idea to look around for a used unit.
Before doing that, though, try to find a known good unit to swap with your's for testing to make sure this is indeed the problem. When it is determined to be bad, before disgarding it try spraying some penetrant/lubricant in the ports, sling or blow out the excess, and replace. In some cases, but not all, this can revive the solenoid for years to come, as was the case with my '91 9KT. This didn't work for my '95 Aero, however.
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