Rapping noise - only at light load? - Saab 900 Bulletin Board - Saabnet.com
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Rapping noise - only at light load?
Posted by es9 [Email] (more from es9) on Tue, 8 Apr 2008 18:16:43
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So I just replaced the transmission and clutch on a new-to-me 89 900T convertible, got everything back together and running - but I cannot track down the source of this noise! It's a metallic rapping sound, only occurs with the boost gauge between atmospheric pressure and halfway to "full vac", only above ~2800rpm. It's very consistant, I can get it in all gears, any speed, but easiest to hear in 5th on the freeway. Either letting off the gas entirely or stepping on it more makes the noise stop, and I can't really reproduce it in neutral, except for maybe for a half-second when I rev the heck out of it while leaning over the engine compartment, when there is possibly a similar noise coming from the vicinity of the clutch cover?
I would just forget all about it, except that driving at 75 causes this noise to occur continuously... Exactly the right 3000rpm part throttle... Not loud enough to hear with the windows down though...
Any thoughts?
posted by 71.235.237...
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