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What component is left to check that could be causing noise? It is

Sent to Car Experts October 09 06:22 PM

I have an '89 Buick LeSabre 3.8 L V-6 engine that has a rattling noise around engine compartment. Have eliminated power steering pump. compressor. water pump. alternator, timing belt. When run engine without serpentine belt, there in NO noise coming from engine. Only when have belt on, but have checked each of above parts separately and they check out. What could be causing the rattling metallic noise?

 

Optional Information:
1989 Buick LeSabre Limited 3.8 Litre V-6

Already Tried:
have checked all components mentioned in question and they check out. engine itself does not make the noise. noise apparent only when pwer steering pump. alternator, water pump, timing belt, compressor are turning by the serpentine belt. but these components have checked out. what is left to check?

Customer (name blocked for privacy)
Status:  Closed   Value: $10
Answer
October 9 6:34 PM (12 minutes and 41 seconds later)
         
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Michael -- Auto Service Technician -- 99% Positive Feedback on 598 Car Accepts
21yrs.Foreign and domestic driveability diagnosis and repair/ ASE Cert./Fuel Injection Specialist.
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