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Plugged Cat/converter?

posted by  No Snaab on  Sat Oct 4 03:17 CST 2003
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I just bought a 1990 740 Turbo with 109,000 miles. When the car is cold I get this strange rattling sound that seems to be coming from INSIDE the exhaust system. The car runs and drives normally, but when I go under an overpass with the sunroof open I can hear this whoshing sound. Also, sometimes (not always though) when I really nail it I get a loud sound that I assume is the wast gate opening. Is that normal? I'm wondering if maybe the "guts" of the cat/converter are rattling around and sometimes maybe blocking the exhaust? I had a simular rattling problem with an 850 as well as a turbo Subaru, both of which had bad cats. Has anyone had a simular problem? Is the turbo going bad?






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