So last weekend I thoroughly cleaned by throttle body as it was pretty dirty and hadn't been cleaned in a really long time (since I owned the car). After I finished cleaning it I put it back on the car and reset the ECU and then did a pedal relearn, a throttle position relearn, and an idle air volume relearn. The car runs beautifully and idles exactly at 750rpm's.
I immediately noticed, however, when I am accelerating above 1500rpm's, I can hear (with the windows down) a loud hissing sound which gets louder the more I accelerate. The hissing sounds like a turbo spooling up.
I checked to make sure that there are no pinched hoses from the intake and everything was reinstalled perfectly. I have a K&N cold air kit on the car. I just thought this noise was normal and didn't really think too much about it, but I now worry a bit that something may be choking. Has anybody else experienced this? Does anybody have any suggestions as to what could be making this sound?
I have another un-related question for anybody who has the K&N cold air kit installed. On the bottom of the intake tube around the middle there are two hose outlet grommets. I only have one hose physically connected because I didn't have another to hook up. Is there supposed to be two hoses hooked up to it? What is the second (larger) hose for? Is this a hose used on other R50 models? I currently have the larger grommet plugged up.
Here are a couple of pics from the installation manual of what I'm talking about
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Thanks!
