Engine Whistle
1971 Jimmy has original 350 with 120,000 miles, rebuilt at 85,000 miles. A few days ago during warm outside temps it had a loud whistle coming from under the hood at start-up and idle (around 800 RPM). It went away with some throttle but returned when the engine slowed to near idle speed. It didn’t change pitch with acceleration, just faded away. This happened a few times. No unusual sounds at higher engine speeds or cruise. When the weather cooled the whistle went away too. I wasn’t able to get under the hood to check further. Any ideas what could cause this?
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Re: Engine Whistle
I'd say it's almost definitely a vacuum leak.
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Re: Engine Whistle
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if you can re-create the sound at idle open the hook and get a closer look. |
Re: Engine Whistle
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Forecast for next week is warm temps so hopefully I can check then to see if the whistle has disappeared. |
Re: Engine Whistle
clutch fan?
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Re: Engine Whistle
When at idle spray some carb cleaner around the suspected vacuum leaks.
If the idle or tune of the engine changes that is the culprit. And since it is 2023, and not 1973, do not let the engine come to temp and then spray the carb cleaner on the exhaust manifold/headers. A friendly disclaimer. LOL S |
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