Thanks for the reply.
While the engine is running I have tried to unplug and plug the vacuum pipes
back. The darn thing does not seem to make any difference. I just can;t seem
to locate the source. I will keep trying.
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.
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
The noise coming on just as it reaches operating temp, and the fans
being on or not affecting it - what shape is the coolant pressure cap in
(i.e., does it need replacing?)? Also, the fans coming on could simply
be changing engine operation enough to cause the noise to stop by
loading the alternator.
(To reply by e-mail, replace the last letter of the alphabet in my
adddress with the letter 'x')
Some FEAD tensioners use a damping shoe arrangment to tame wierd belt
dynamics at idle or with varying loads . I have an older minivan (with most
a worn out damper) that will get into belt squeal at the alternator at idle,
squeal goes away with any amount of increased throttle.....just a small shot
spray-on belt dressing will quiet it for days at a time.
Be careful with that belt dressing, allot of times the belt squeals because
of alignment problems, and putting that stuff on my make the belt slide off
the tensioner, Not saying that is why yours is squealing
As I said, "a small shot". If I had ever had a belt jump in this manner, do
you really believe I would have even mentioned it?
We were trying to help the OP find his :"whistle"...not give me a lesson in
belt alignment or other FEAD design issues.
Well, take it easy with the lube (I hope you mean belt dressing)..just a
little bit on the drive side of the belt is plenty..(see maxpower's caution
about belt jumping). Frankly, now that Denny has surfaced the water pump
seal possibility, that sounds more likely.....
can drive someone nuts. If you had a long piece of heater hose you could
slip it down the front by the timing cover just over the water pump and pick
it up that way with your ear, anyway, good luck
This sounds so familiar I could cry.. It is coming from the seal in the
water pump. And don't ask me how long it took me to find it the first time I
ran into it. <G> I've ran into this whistle noise exactly as you have
described it two times and the pump has fixed it both times.
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