Hello, im very much into e30's in general, and am looking at buying one. However the one i have checked out (absolutely pristine condition), had a pretty bad noise that i narrowed down to a bad timing chain tensioner. The owner realized it was a selling problem, so she fixed it. Are there any possibilities that the engine is a time bomb? When i test drove it with the rattling, tapping sound, you couldn't "feel" any hesitations or misfires. just the noise.