Wow! I learned a lesson today. This may not be news to most of you, but it
was certainly enlightening to me. Apparently they use that "S" bolt on the
K&N filter for a reason. I had broken that bolt when I first installed my
FIPK a couple of years ago and instead of getting a new one, I just went to
Home Depot and bought a 1/2" longer bolt for my factory bracket. Today I
found some information on the KRC website that led me to believe maybe I
needed that "S" bolt after all. To get to the point, I made one out of
all-thread and installed it today. Voila, that horrible hissing, sucking
sound is all but gone. I wouldn't have thought that factory bracket could
have caused that much restriction in air flow, but I guess it does. I'll
file that one under "D" in the "DUH" folder. I may still look into that F&B
though ;-)
>
> <jon@dakota-truck.net> wrote in message
> news:bh3alt$euv$1@bent.twistedbits.net...
> >
> > "BlackDak93" <stephen.barnett@worldnet.att.net> wrote:
> >
> > : I know that the Idle Air Control Motor provides air for the engine at
> idle,
> > : but can someone explain to me why it opens up during acceleration? I
> don't
> > : know if it is worse with a high flow air filter or if you just hear it
> more,
> > : but it sound like sh**t. It sounds like it is sucking it's last dying
> gasp
> > : of breath. Is the stock TB not allowing enough air in or what? I have
> had
> > : this happen on two different engines, 3.9 and 5.2, and have replaced
the
> > : IACM even though it wasn't bad. I'm sure others have experienced this.
> I'm
> > : about ready to pitch my K&N just because I can't stand the noise. Is
> there
> > : any remedy for this?
> >
> >
> > It opens in anticipation of the throttle blades being shut after
> > the accelleration event is over. (Having the max available amount of
> > air flowing through the TB during WOT might be a factor too, but I'm
> > not sure about that.) Generally, after you are done accellerating, you
> > will let off on the gas, and could potentially let off on the gas all
> > the way, completely closing the throttle body bores. However, the
engine
> > is still at a high RPM, needs some time to wind back down, and is still
> > pumping air during that time. Having the IAC open guarantees that
> > there is an available source of air should the throttle blades be
> > suddenly shut.
> >
> > An F&B Billet TB might reduce the whistle since it is a different
> > design than stock (you'd have to check with Bruce on that
> > http://www.fbthrottlebodies.com/), or you could revert to a K&N drop-in
> > with the stock intake system. I've never really noticed it on my
> > trucks, or if I have, its not a sound that has registered as being
> > "bad". Maybe turn up the radio or get a louder exhaust? ;-)
> >
> >
> > --
> >
> > -Jon-
> >
> > .---- Jon Steiger ------ jon@dakota-truck.net or
> jon@jonsteiger.com ------.
> > | I'm the: AOPA, DoD, EAA, NMA, NRA, SPA, USUA. Rec & UL Pilot -
SEL
> |
> > | 70 Cuda, 90 Dak 'vert, 92 Ram 4x4, 96 Dak, 96 Intruder 1400, 96
FireFly
> |
> > `------------------------------------------
> http://www.jonsteiger.com ----'
>
>
>""BlackDak93"" <stephen.barnett@worldnet.att.net> wrote in message
news:bh3l5b$t5p$1@bent.twistedbits.net...
> Thanks Jon for that info. That makes sense, I guess. Actually I did try
the
> drop in K&N. That wasn't really want I wanted either. I also did go to a
> louder exhaust, although not for that reason. I put on a Flowmaster 50 and
> now in addition to the annoying sucking sound during acceleration, I have
an
> even more annoying rumbling and stumbling and backfiring during
> deceleration, but that's another story.
>
>
This archive was generated by hypermail 2b29 : Fri Feb 06 2004 - 11:46:46 EST