Re: Hissing upon start-up, now screeching - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Re: Hissing upon start-up, now screeching
Posted by Nickshu (more from Nickshu) on Mon, 20 Mar 2006 14:21:17
In Reply to: Hissing upon start-up, now screeching, Kymman, Mon, 20 Mar 2006 06:05:31
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This is not normal. Your secondary air injection (SAI) system valve is broken, or the hoses are split.
This system blows air into the exhaust at cold startup to help the catalytic converter do its job. It shuts off after a few moments of idling. It's nothing more than a reverse-plumbed shop-vac motor in the left fenderwell. There's an anti-backflow valve which operates on a vacuum switch on the firewall. This valve is plastic, and in the hot area it is positioned in, it gets brittle with age and cracks, leaking air when the pump is on, and leaking exhaust when the pump is off.
Nick
95 900S
posted by 131.158.12...
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