"Paul Singh" > wrote in message
news:u7zUd.43418$EL5.35643@trnddc05...
>
> "maxpower" > wrote in message
> ...
> > it could be a broken intake gasket, if it is a vacuum leak, take a
runner
> > hose to your ear and use it as a stethoscope to locate the leak, or at
> > lease
> > eliminate that possibility
> >>
> >
> >
> In between I have cleaned the throttle body, air plennum and fuel
> injectors( new O rings). All the gaskets were
> replaced with the new and the bolts were tightened to the FRM specified
> torques. Lot of black stuff I removed. The whistle was there before and
> still is. I cleaned the intake area because I have never cleaned it in
over
> 12 years. So I suspect that is not the cause. Last night I looked at it
> again but nothing positive to report about. I think it may help if I
explain
> the symptoms a little more.
>
> a) The whistle only comes when the Engine is at operating temps.
> b) If I come home and sit there for couple of minutes without turning the
> engine off, no whistle.
> c) If I let it idle for few more minutes, whistle yes. If I rev it, it
goes
> away. Let it idle, it will come back.
> d) Driving normally, no whistle.
> e) While idling if the radiator fan comes on, whistle goes away. It comes
> back as soon as the fan stops.
> f) I removed the PCV valve suction pipe and put my finger on the PCV valve
> to seal the suction. Nope it didn;t help. I can remove the PCV valve
> completely and then see if the whistle goes away.
>
> Lately I also replaced the thermostat because of the engine code. The
> thermostat I bought is not made by chrysler but got it from Schucks which
I
> think is made by prestone. Come to think of it, the whistle was there
prior
> to replacing the thermostat.
>
> I tried to locate the vacuum leak. No luck yet. While the engine is
running
> I tried removing one vacuum pipe at a time to see if that makes any
> difference. No luck. Well, I haven't tried all of them yet.
>
> The fan belts seem to have proper tension, auto tensioner is free to move
> and has good tension to keep the belt tight. The compressor belt has
enough
> tension. I have tried different levels of tension on the compressor belt.
I
> would suspect the pulleys if the whistle is there all the time. If I start
> the engine cold, no whistle. It starts suddenly when the temp is about to
> reach the operating level.
>
> Can it be ignition timing related at all ?
>
> Bloody hell, I can't even pin point where the whistle is coming from. I
> asked my wife to help me locate the area it may be coming from. She seems
to
> think it is from the left side of the engine i.e. the surpentine belt
area.
> It is getting to be a challenge now.
>
> I will try your runner hose method and will report.
>
> -Paul
>
>
Sounds like it changes when the load changes (vacuum) I would suspect a
piece of old gasket left when reassembled. but without hearing it, it is
hard to tell. get out that heater hose and use it as a stethoscope and you
will pin point the noise