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Old 08-22-2005, 12:11 AM   #11
wgknestrick
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Join Date: Jun 2005
Location: Allentown, PA
Member #542

My Ride:
04 STI with ITBs (yes it runs)

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First, all BOVs need to be broken in. It takes time for the plunger to wear into the cylinder.

2nd, It sounds like your BOV is sprung too tight.

Too tight = compressor surge on light lifts
Too loose = Idle stumbles.

Adjust your BOV by adding shims to tighten it up, removing them to loosen. If you have all shims out and it is still surging, cut a little off of the spring or get a shorter one.

Bill
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