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Following with interest, as I'm having a similar issue
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Posted by Blue Devil [Email] (#3630) [Profile/Gallery] (more from Blue Devil) on Tue, 4 Jul 2023 12:06:25 Share Post by Email
In Reply to: startup knock, calvin, Mon, 15 May 2023 10:53:20
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Any luck identifying the cause of this sound? I'm refreshing a 1994 C900 convertible that's been sitting for a while, and have been getting a similar if not identical noise upon starting it up for the first time. Fresh fuel with a new pump and filter, rebuilt injectors, and completely new ignition system would rule out those elements. It's not idling roughly or noticeably vibrating, so I'm hoping whatever's causing this noise is not a sign of serious damage.

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