vroom vs putt-putt - Saab 9000 Bulletin Board - Saabnet.com
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vroom vs putt-putt
Posted by Ben [Email] (more from Ben) on Mon, 19 Jul 2010 13:42:44
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Hello board,
Two questions:
1. For general reference: What makes the "putt putt" noise you often hear on rather run-down cars that once vroomed? It isn't coming the exhaust. I've heard this on newer (obviously fuel-injected) cars (not Saab specific), but it sounds something like a carbureted engine.
2. My car, the 91 n/a: Something from the engine makes a striking noise under heavier throttle between 2500 and 4000 RPMs, and disappears at higher engine speeds. If I ease off the gas, or simply coast in gear between those RPMs, no noise. To help, since I don't have any good onomonopia, think of intake growl, then add a somewhat soft, but very apparent rapping sound, as though you're tapping the valve cover with a screwdriver. Could this be knocking? I've run premium since I bought the car 80k miles ago, and I don't know what knocking sounds like. DI is about 3 years old.
Ben
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