C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Noise on shutdown

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Old Aug 13, 2020 | 04:39 PM
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Default Noise on shutdown

My mate's Corvette C4 again - it has recently started to make a noise after the engine is shut off. When the key is turned off, the engine ceases to fire and as it slows to a stop there is a light rattling/whirring noise. I'm wondering if it could be some wear in a pre-engaged starter, or similar? Anyone else had this?

Thanks chaps

Roger
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Old Aug 13, 2020 | 08:59 PM
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It could just be the fans coming to a stop.
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Old Aug 13, 2020 | 09:07 PM
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I get a strange knocking noise when I shut my car down after a long drive. It's done it since day one so I never pay any attention to it. These car's are a little weird that way.
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Old Aug 14, 2020 | 03:37 AM
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Thanks for the thoughts - it's quite a 'superficial' noise, nothing inside the block, I'm sure of that. It's further back than the fans and it's a new noise, not there for the last 12 years. The car doesn't get much use so I'm thinking it may be the starter - are these pre-engaged? Or do they have a throw-in Bendix?
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Old Aug 14, 2020 | 04:30 AM
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Air conditioning equalizing for $200
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Old Aug 14, 2020 | 10:38 AM
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What year Vettes here??
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Old Aug 14, 2020 | 11:18 AM
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Had a horrible whining noise coming from the passenger seat area. Became single now its gone!
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Old Aug 15, 2020 | 06:00 AM
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Originally Posted by 65Z01
What year Vettes here??
Sorry - '89 C4
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Old Aug 15, 2020 | 06:45 AM
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Auto or ZF6?
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Old Aug 15, 2020 | 08:39 AM
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Originally Posted by FASTAZU
Auto or ZF6?
Auto.
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Old Aug 15, 2020 | 03:18 PM
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Double check your cooling fans as the fan could be starting to have bearing issues, and they do like to spin down after shutdown and make more noise when wearing out.

Is the noise coming from the area around the serpentine belt, specifically the tensioner Pulley? Mine made some strange sounds before giving out completely.

I have seen branches stuck near the fans make new noises, you can pick something up easily.

Best Regards
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Old Aug 15, 2020 | 05:24 PM
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Default Could be smog pump

My smog/air pump will make a odd noise just as my 89 is turned off after a drive could be described as a Kind of a rattle
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