High pitched whistle

1992 FORD F-250
140,000 MILES • 7.5L • V8 • 2WD • MANUAL
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LORDREDSOMERS
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I replaced the engine a year ago and thoroughly cleaned the injectors before reinstalling them. I am now getting a high pitched whistle from the passenger side of the engine and can’t tell it it is coming from the injectors or from the intake manifold. How do I figure out which one it is?
Jul 14, 2020 at 3:43 PM
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KASEKENNY
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If it is making the noise while idling then more then likely it is the intake and a vacuum leak. Here is a guide that talks about this:

https://www.2carpros.com/articles/car-whistling-noise

I would suggest taking some brake clean and spraying it around the area the noise is coming from and seeing if the idle raises. If so it is the intake or a vacuum line.

Let us know what you find. Thanks
Jul 14, 2020 at 6:09 PM