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"McIntyre, Richard" <firstname.lastname@example.org> said:
...the noise is not really speed sensitive.
> It NEVER occurs while coasting or under significant acceleration. It
> ONLY occurs when the accelerator is very slightly "open" -- at the
> point that speed is just maintained. To me this means it's
> related to either 1) intake vacuum, or 2 torque somewhere in the
> drive train. There are certain speeds at which the noise is more
The vacuum issue is a possibility. Remember that you have maximum
vacuum when you let up on the throttle - accelerating reduces the
amount of vacuum present. Most vac. leaks happen when you have more
vac - which would mean deceleration. So this noise is indeed
different, in more than one way.
> My car has no speakers in the dash, yet the sound source seems to be
> located in or in front of the dash.
Kinda rules that one out, dunnit????
> I guess maybe you have to experience it to understand why we
> think it has nothing to do with the radio or speakers. It
> is certainly perplexing.
I understand that now!
You still may need a passenger with a sharp ear to go all around that
dash while driving - maybe with some of the under-dash panels removed
to let the noise out more clearly.
I think vacuum is more likely than torque, as you otherwise would not
be hearing it from the dash....
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