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Loud Noise on Startup

Old 01-03-2019, 10:36 AM
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Natedog325
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Default Loud Noise on Startup

I purchased a 2003 350z this September and love it. The problem is on startup there is a loud noise coming from the engine that I cannot describe. It lasts about 2-3 seconds and then goes away. I hear a similar noise, although not that loud, sometimes when I am driving. Does anyone have any ideas or has this happened to anyone else?
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Old 01-04-2019, 07:27 AM
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dkmura
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Welcome- a loud noise on startup could be from any number of things. If the noise is apparent while you're cranking the starter, I'd suspect the starter is not bolted up tight, or possibly another starter-related issue. If the noise continues after starting, there's a possibility of an engine-related issue. But without being there, or at least a better description of it (high pitched? whirring? metallic?) there's no chance of even guessing very well.

To my knowledge, this isn't a common problem or usual complaint with the 350Z.
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Old 01-06-2019, 06:47 AM
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If you cannot describe, how can anyone prescibe?

Could be belt squealing (worn belt), knocking (something internal, or something vibrating, cat stuck in engine bay?

Can't answer without more information/ a soundclip.
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