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Somewhat embarrassing, but the cause of this resonance was a loose nut on one side of the cat/flex pipe connection, and the exhaust was acting like a saxophone, i.e. resonating at some wavelength proportional to the length from the engine to the "hole". Either I did not tighten the nut as much as I should have (I have broken one of these studs before, so I'm a bit gun shy and don't wail on it), the nut worked itself loose (I use stainless steel nuts for easier removal "next time" and they don't rust in place as normal steel nuts do), or the joint just settled in/loosened up over a couple of months - one side was the old cat with a rusty mating surface on the flange.
Sometimes it's the easy stuff! On to the next issues.......
posted by 108.71.134...
Posts in this Thread:
- Noise/Vibratons at certain frequencies, Bill Homer
, Fri, 19 Oct 2012 14:04:53- Solution: one exhaust nut was loose, Bill Homer
, Wed, 24 Oct 2012 21:02:49 <-- Viewing This Message - Re: Noise/Vibratons at certain frequencies, sm333ace, Sat, 20 Oct 2012 10:59:46
- even when in neutral and car is stopped?, dref, Fri, 19 Oct 2012 16:36:27
- Any chance it's the exhaust stay?, Noel, Fri, 19 Oct 2012 16:36:02
- Hate to suggest, balance shaft/chain troubles?, RayF, Fri, 19 Oct 2012 15:08:28
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