[V8] Engine Still Not Running Smoothly ...

[D Morralee]

maybe I'm off track but is the air filter and V8 cover on the engine when you hear this sound ? I know when I have the airfilter and cover off it sounds like a GM 350 4 carb engine :-) superdave 
 
> From: urq at pacbell.net
> To: v8 at audifans.com
> Date: Sun, 8 Nov 2009 12:09:51 -0800
> Subject: Re: [V8] Engine Still Not Running Smoothly ...
> 
> 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
> 
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