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I have repaired SAI issues on three different cars.
-One had a plugged check valve on the line that provides the vacuum source (part #7 in the diagram luv2box posted, but in my case, it was located down near part #6)
-Another had broken vacuum tubing. It was all brittle, so I replaced it completely.
-The other had a bad change-over valve. (part #3 in that diagram) To replace it, I removed the alternator. It is located directly behind the alternator and can not be reached from the top unless you remove the intake manifold -much easier to take the alternator out.
I'd suggest checking for broken vacuum hoses first.
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I am not an attorney, mechanic, or member of the clergy. Following any advice given in my posts is done at your own peril.
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