Intake whistle?????

camon

New Member
Sep 19, 2005
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Hey folks!

I have a 2001 GT With some mods (LT headers, CAI, Direct port Nitrous system and now added a Accufab plenum and 70mm throttlebody).

Well I installed the accufab combo today went pretty smooth with one little problem. I stripped the driverside rear plenum to intake insert. The good news is it only stripped the first 2 or so threads. What caused this was after I tightened them the first time and buttoned everything up and started the car I had a pretty load whistle sound coming from the intake,plenum,throttlebody area (couldn't pin point the exact location). So I put just a touch more torque on the plenum/intake screws and thats when I heard a pop and the brass insert stripped. The accufab plenums mounting area looked to be just slightly thicker then the ford stock plenum which is probably why the damn screw striped (it only caught like 2 threads in the insert!!

What don't make sense is the whistle was present prior to the brass insert stripping which means I must of had it tight enough from the beginning!
Anyway.....I noticed that the screws for the plenum/intake mounting don't seem very long (after they pass through the plenum and plenum spacer there is only like 2 or 3 threads showing). Is it just me or does this seem kind of igrorant on fords part not to use longer screws (hell the holes in the intake are deep enough to support longer screws).

Well I put the old plenum and throttlebody back on and found a old screw laying around my garage that was like 1 thread longer used it in the bad insert and it tighened up. So as of right now my I have my old plenum/throttleboby on and it isn't whistling.

I'm gonna go buy 4 longer screws monday and try it again!

Anyone have any thoughts on where this whistle is coming from? Is it the intake or could it be from the throttle body???? I noticed the old throttle body I removed had a small hole drilled in the throttle plate (butterfly)! THe new accufab has none (anyone know the purpose of this hole??????)

Thanks....look foward to hearing from you guys!