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i have 1999 mercury cougar with 47,000 miles o it and it is an automatic 2.5 liter v6 i have a wierd noise ewhen im in drive and it usually occurs when the engine temp gauge gets to about halfway where it stops and beetween 1800- 2500 rps is when i here this rattle me it sond like its coming from the right side{when your in drivers seat} where the cam shafts are i had a cam shaft seal replaced when i first go the car it was fine and the about 2 or 3 months ago i started hearing the noise ,me and my buddy danny though the noise could befrom an idler pully but we arent sure any idea on what it could be if you have any idea or have had the same problem please post a comment and if you need more info i can tell you ANYTHING you would need to know thanns alot chris:hitit:
 

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I have the same problem, flywheel/flexplate related problem. Check a few post down about flexplate/flywheel grindage...... BUT my noise is from the drivers side...so maybe its something totally different.
 
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