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06-15-2022, 03:30 PM
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#1 |
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Newbie
Join Date: Jan 2022
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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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06-15-2022, 04:16 PM
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#2 |
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Old and boxy but good.
Join Date: Jun 2002
Location: S NJ, a suburb of Phila.
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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.
__________________
Dave, 1982 242 turbo. 338k miles. MVP coilovers and 3" exhaust. Flowed 405 with a V15. Cossie turbine housing with upgraded compressor housing. 90+, IPD remote oil filter. Some other goodness, too. Been lots of fun over 25 years. Restored in 2k. Now ready for a 2nd restoration. 1993 245 Classic, 440k miles, enem V15. IPD bars and chassis braces. Simons sport exhaust from Scandix. sbabbs ezk chip. Been a good road warrior. Genuine Volvo rebuilt leaky M47. 
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06-15-2022, 04:21 PM
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#3 | |
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Newbie
Join Date: Jan 2022
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Quote:
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06-15-2022, 04:34 PM
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#4 |
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The Librarian
Join Date: Nov 2011
Location: So Cal
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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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06-15-2022, 05:38 PM
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Newbie
Join Date: Jan 2022
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Quote:
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06-15-2022, 09:15 PM
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#6 |
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<Master Tech>
Join Date: Nov 2002
Location: California
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Spray around with brake cleaner and see if the idle changes
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