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On Thu, 2005-06-09 at 14:39, Daniel Baum wrote: > Hi all, > > Ever since I have been driving my car, it has always made a certain noise > under certain conditions, and I have never been able to find out what it is. > > It's a kind of rustling or rattling noise that starts when going up a steep > hill at almost-full throttle in third (i.e. top) gear. If I lift off the > throttle slightly it will stop. Also, downshifting will stop it altogether. > Once it has started doing it, it will carry on doing it whenever I have use > slightly higher than usual throttle - even on much less steep hills - until > I stop the car. Again, downshifting will stop it. The engine doesn't seem to > be running too hot. > > It has always done it. Timing doesn't seem to affect it, since I have > retarded my timing quite recently when I started using a strobe timing > light. Changing the exhaust didn't stop it, and neither did the last batch > of work that I did on the engine, so it isn't rattling tin or the fan. > > There is no noticeable effect on performance when it makes this noise, but > it bothers me because I don't know what it is. > > Does anyone have any idea? > > Detonation. Try backing your timing off about 2-3 degrees. -- Russ Wolfe '71 FB AT '66 FB MT '64 T34 (not running) '65 T1 (not running) '05 KIA Sorento SUV russw@classicvw.org http://www.classicvw.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~