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Old 06-15-2022, 03:30 PM   #1
bigjoe04
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Question 1992 volvo 740 horrible squealing

My car started making a high pitched squealing noise it makes this noise nonstop at idle driving warm or cold. I verified that it's not the belts it still does this with no accessory belts at all. I also removed the timing belt cover that all looks good. Its also not the turbo. I checked over the hoses pretty thoroughly for a vacuum leak I haven't found anything but I haven't fully ruled it out. Im lost as to what's going on could it be the transmission or something inside the engine? Could it be air getting around the injectors Im running bosch green giants
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Old 06-15-2022, 04:16 PM   #2
dl242gt
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If the timing belt tensioner is seizing that may make a squealing noise. The tensioner can look fine but when you roll it by hand you'll feel the worn bearing.

Sounds like something rotating when running so the tensioner came to mind.
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Old 06-15-2022, 04:21 PM   #3
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Quote:
Originally Posted by dl242gt View Post
If the timing belt tensioner is seizing that may make a squealing noise. The tensioner can look fine but when you roll it by hand you'll feel the worn bearing.

Sounds like something rotating when running so the tensioner came to mind.
Sorry I forgot to mention I tested the tensioner it was smooth
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Old 06-15-2022, 04:34 PM   #4
hiperfauto
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It's definitely an air leak. You can tell because the pitch changes as soon as you crack the throttle.

A split intake gasket can whistle like that. Get a piece of hose and hold one end to your ear and search around with the other to find the source of the leak.
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Old 06-15-2022, 05:38 PM   #5
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Quote:
Originally Posted by hiperfauto View Post
It's definitely an air leak. You can tell because the pitch changes as soon as you crack the throttle.

A split intake gasket can whistle like that. Get a piece of hose and hold one end to your ear and search around with the other to find the source of the leak.
I'll give that a try thanks!
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Old 06-15-2022, 09:15 PM   #6
ZVOLV
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Spray around with brake cleaner and see if the idle changes
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