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"McIntyre, Richard" <mcintyre@wsbs-mses.eng.pko.dec.com> 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 > noticeable. 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.... Al Powell Voice: 409/845-2807 107 Reed McDonald Bldg. Fax: 409/862-1202 College Station, TX 77843 Email: a-powell1@tamu.edu W3 page - http://agcomwww.tamu.edu/agcom/satellit/alpage.htm "Baseball is 90 percent mental. The other half is physical"... ...Yogi Berra.
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