In a message dated 5/2/2007 8:24:41 P.M. Eastern Daylight Time, lmbarrie@xxxxxxxxxxxxx writes: Greetings one and all. Big Yellow has developed a whistle of some sort, which appears to be emanating from the back, center part of the engine compartment. The noise begins to occur when warmed up, at fast idle, before it is kicked down. It will increase tonally (to a higher pitch), with engine speed up to about 3000 rpm, when it will disappear. It will then return as the RPMs drop, decreasing tonally, when approaching idle again. I am not sure if the whistle is from pressure or suction, but my guess is pressure. I have not noticed any leaks. It is fairly loud and can easily be heard through a closed hood. Any ideas out there in 300 land? Thanks! Louis M. Barrie West Hills, CA Home of Big Yellow I am not sure of the problem, but I believe that I would check the distributor vacuum advance circuit for leaks. The noise you describe seems to be reminiscent of the vacuum advance curve coming from/produced by the carburetor. Joe Savard Lake Orion, Michigan ************************************** See what's free at http://www.aol.com. [Non-text portions of this message have been removed] To send a message to this group, send an email to: Chrysler300@xxxxxxxxxxxxxxx For list server instructions, go to http://www.chrysler300club.com/yahoolist/inst.htm For archives go to http://www.forwardlook.net/300-archive/ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Chrysler300/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/Chrysler300/join (Yahoo! ID required) <*> To change settings via email: mailto:Chrysler300-digest@xxxxxxxxxxxxxxx mailto:Chrysler300-fullfeatured@xxxxxxxxxxxxxxx <*> To unsubscribe from this group, send an email to: Chrysler300-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/