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rob6539 wrote:I can hear a noise like a vacumm cleaner, but I assumed it was the air filter induction noise.
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To some extent that's normal induction sound on a turbo.
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rob6539 wrote:I've got a HKS blow off valve.I sprayed it with leak detector when I was inspecting all the joins on the inlet pipes and it spat some of the fluid out when I was moving the throttle cable.
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You would expect the BOV to release a little air when you come off the throttle, even when you're revving the engine in neutral.
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If you've got long enough arms, you could put your hand infront of the BOV to feel if there's air coming out on throttle or not.
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