Tapping sound from failing purge valve - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Tapping sound from failing purge valve
Posted by Geoff [Email] (more from Geoff) on Sat, 28 Feb 2004 12:13:37
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When I was an Anders' place last weekend for an oil change and a tranny mount I asked him to diagnose a steady rapid (3-4x per second) light tapping sound I heard from the area of the passenger footwell. I only heard it when the engine was warmed up and either idling or under very light throttle. He suspected the purge valve and it turned out to be the source. I ordered one from Eeuroparts and swapped it in a few days ago. Tapping gone. Question for the experts is what would make it tap like that? Any automotive pathologists want it for a post-mortem dissection?
BTW this was the same purge valve that was involved in a fuel system overpressure last year when an ECU bug opened it while on boost. Ruptured the fuel pump casing and retaining ring and partly expelled the pump and sending unit from the tank. Very loud pop!
/Geoff
'96 900SET A/T 105.2k mi
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