New venting noise.. what is it?? - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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New venting noise.. what is it??
Posted by Nate (more from Nate) on Wed, 3 Dec 2003 13:31:27
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A new noise is always an education with these cars. I am talking here about a '99 9-3 base. Over thanksgiving, I heard it after driving 5+ hours the night before (to NC from AL); I went out and started the car and let it idle for several minutes... Upon starting the car, I heard this somewhat sporadic 'hiss' from under the hood [not high pitched like a squeal, but lower pitched, like a low pressure vent..probably < 20 or so PSI with a decent size opening] Anyway, I got curious, and depressed the accelerator with the car in neutral, and the noise sputtered a bit then disappeared, only to return about 30 seconds after allowing the engine to return to idle speed. I took a look under the hood, and listened for the sound. I noticed a sulphurous smell. As best I can tell, the noise is coming from some of the nearest exhaust hardware to the engine, near the (L/R) center, and towards the rear of the engine compartment almost under the dash. There looks to be some or other type of release valve [O2 sensor? CAT?] on the exhaust pipe, and I assume that this is the source of the noise. I noticed the sound again a couple times while driving up there, but havent heard it at all since I got back home. Anybody know what this is? Got any suggestions?
posted by 138.26.47...
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