Im so mad. after doing all this work to change the intake manifold gasket, i got my car back together and put coolant flushing stuff in and started it. it started ok, but there is a high pitched whistle. it isnt throwing a code, but i can tell its not running as smooth as it should be. i checked the vacuum line that goes around the supercharger, all the connections look good. what else could it be? could the fuel injectors not be in all the way? the fuel rail is bolted down good.
thanks

Take the oil filler cap off and see if the whistle stops. If so, you have a problem with the pcv valve. Did you replace it? If so, check the O-ring. Check the hose to the brake booster, also.

i agree 90% of whistling issues after Intake work turns out to be something with the PCV, like a missing o-ring, or a disconnected vacuum line

i just pulled the pcv valve out, its fine. ive checked the vacuum lines. i had to make a new tee that connects to the intake manifold, but its not leaking. the brakebooster vacuum line is fine. now my SES light is on. :? there was something weird i noticed. on the 3way vacuum "distributer" , the brake vacuum was connected, the boost regulator(thats what im assuming it was, on the side of the supercharger) was connected, and there was a third nipple pointing toward the firewall, with what i thought was the remnants of a cap. was there supposed to be a hose connected there? gawd, i hope i can find out wtf is goin on, ive been without a car for almost a week now.

When I got my 01 SSEi, there was a jury riggrd vac T that someone had plugged off with a screw. I told the dealer to fix it, and if I am not mistaken, it just needed a cap on it. It was in the same area you are describing. I would plug it off and see if your light goes out. (The code, I would think, should read lean.)

Let us know

On our cars, that 3rd nipple should just be capped off. That cap dries out, and cracks.

the 3 way vacuum port already has a cap on it. i dont remember taking a line off of it, so i think thats what was there before, it just fell apart. i think i will check all the lines again tomorrow and i might drive to auto zone to get it scanned. theres only one vac line going to the throttle body, right? im just guessing at this point. Im thinking its gotta be a vac/air leak. unless you guys can think of a mechanical problem that would cause a high pitched whistle.
:?

High pitched whislte is almost always a vacuum leak. Quickest way to find one is to get a can or two of throttle body/carb cleaner and as the motor is running, spray the heck out of all areas with vacuum lines. When the motor changes rpm or pitch, that'* where the leak should be located.

alright, ill try that after work. first, ill check all the tees/elbows on the line, then spray it.

i took off the vac line and visually inspected it. no cracks, tears or holes. i then put it back on and sprayed the crap outta it. no change. now im thinking of taking it apart again to find out what the f-bomb l i did wrong. any other suggestions?