Apparently upper valve train problems are not unheard of in these cars. I can't speak to what exactly goes wrong but you might just want to get your mechanic to at least look at it. I'm sure simply diagnosing the issue would not cost much. ----- Original Message ----- From: Raymond Shaw <dienasty233@xxxxxxxxxxx> Date: Wednesday, February 26, 2003 8:54 pm Subject: IML: Got a question concerning my 91 Imperial > Okay here goes, I was out driving today like usual, well partially > because I > was looking for another job to help fund my Imperial into other > things, or > possibly fund me buying another Imperial as I discussed before, > well I > pulled it in the driveway, and I could have sworn I heard a > tapping noise, > so I naturally open the hood leave the car running, and it sounded > like it > was coming from the valve cover. > > It seemed odd to me, so I reved the engine a bit and it got louder > with the > engine, my oil pressure and my engine temp is just the same as it > ever was, > everything is normal according to the guages. > > Not sure what to think. > > help...