Whine or whistle from 3.9L

#1

This van I bought has a high pitched whine or whistle when driving
around town. It occurs when you step on the gas. The faster the engine
turns the more high pitch it becomes. When the foot comes off the gas
it becomes louder but lower pitched for a second or two. At idle the
noise isn't noticed and isn't heard at highway speeds. I'd like to know
whether it's a noisy alternator or a vacuum leak? I was assuming it was
the alternator but then it could be associated with the check engine
light that came on once recently, showing code 0121.

#2

"Moses" <moses (AT) spoof (DOT) net> wrote

Quote:

This van I bought has a high pitched whine or whistle when driving around
town. It occurs when you step on the gas. The faster the engine turns
the more high pitch it becomes. When the foot comes off the gas it
becomes louder but lower pitched for a second or two. At idle the noise
isn't noticed and isn't heard at highway speeds. I'd like to know whether
it's a noisy alternator or a vacuum leak? I was assuming it was the
alternator but then it could be associated with the check engine light
that came on once recently, showing code 0121.

A vacuum leak would be loudest at idle speed since that is when the manifold
vacuum is highest.
Dale P..........

#3

On May 6, 3:19 pm, "Dale_Peterson" <dale_peter... (AT) verizon (DOT) net> wrote:

Quote:

"Moses" <m... (AT) spoof (DOT) net> wrote in message

news:463d87c4$0$4684$4c368faf (AT) roadrunner (DOT) com...

This van I bought has a high pitched whine or whistle when driving around
town. It occurs when you step on the gas. The faster the engine turns
the more high pitch it becomes. When the foot comes off the gas it
becomes louder but lower pitched for a second or two. At idle the noise
isn't noticed and isn't heard at highway speeds. I'd like to know whether
it's a noisy alternator or a vacuum leak? I was assuming it was the
alternator but then it could be associated with the check engine light
that came on once recently, showing code 0121.

A vacuum leak would be loudest at idle speed since that is when the manifold
vacuum is highest.
Dale P..........

it sounds like he has an air to air leak between the intake and the
air box

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Whine or whistle from 3.9L

Dodge Dodge Cars Discussions (alt.autos.dodge)

Whine or whistle from 3.9L - 05-06-2007 , 03:46 AM

Re: Whine or whistle from 3.9L - 05-06-2007 , 03:19 PM

Re: Whine or whistle from 3.9L - 05-09-2007 , 08:08 AM