[V8] Engine Still Not Running Smoothly ...

[Ingo Rautenberg]

Hmm.  Both engines should sound the same with the engine covers and filters
left in or removed.  Maybe one is missing the honeycomb air stabilizer
insert at the air inlet opening? The hissing goes away when you open up the
throttle iirc. There's always an inherent hissing from the air intake at
high vacuum (idle).

On Sun, Nov 8, 2009 at 3:09 PM, urq <urq at pacbell.net> wrote:

> Thanks for the quick response Jason and Ingo,
>
> Sorry that I wasn't clear in my description, the "shhhhh" sound is clearly
> coming from the intake manifold.  It is a pronounced and sharp sound,
> sounding much like my recollections of an unfiltered multi-barrel carburetor
> idling back in the olden days.  I don't recall hearing this sort of a sound
> from a PT motor before ...
>
> I'm pretty sure the source of the sound is the ISV.
>
> Steve Buchholz
>
> -----Original Message-----
>
> As have I -- crack in the line (black hard plastic) underneath the
> passenger strut to mount. Hissing sound and cause of elevated idle.
>
> Ingo Rautenberg
>
> -----Original Message-----
> From: Jason Wilkerson
>
>
> When I first bought my v8 there is a frequency valve under the passenger
> front fender - it had a rip in the diaphram - made a hissing sound.  Also,
> I've seen the hose going to the FPR rip and do the same thing.  Worth a
> look.
>
> --- On Sat, 11/7/09, urq <urq at pacbell.net> wrote:
>
> > When I got the engine back together I
> > left the big cover that holds the air
> > filter in place off (the air filter was installed).�
> > The engine does seem to
> > run more smoothly � perhaps due to the fact I had to mess
> > with � of the
> > spark plug wires when I pulled the distributor.� I�m
> > still thinking the
> > engine is a bit down on power compared to the other car �
> > but perhaps this
> > is due to the cams from the automatic engine �
> >
> >
> >
> > As those who have pulled this cover know, the engine intake
> > sounds are much
> > more audible with the cover removed.� One thing I
> > noticed was that I could
> > hear a variable hissing at idle.� I�m thinking it is
> > the ISV, and perhaps a
> > sticky ISV � but it did seem to cause a bit of rough
> > running.� I
> > disconnected the ISV and kept the engine running by
> > cracking the throttle a
> > bit, no hissing.�
> >
> >
> >
> > I�m going to use the carb cleaner method to see if the
> > ISV is sticky, but if
> > any others out there have had to deal with similar issues
> > and have something
> > to share I�ll appreciate hearing from you!
> >
> >
> >
> > Steve Buchholz
>
> _______________________________________________
> Audifans V8 mailing list
> Send posts to: mailto:V8 at audifans.com
> Manage your list connection: http://www.audifans.com/mailman/listinfo/v8
>
> You can help keep the audifans site running by shopping at
> http://audifans.com/shop/
>
>