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Hi, when my 1997 stagea is idleing if i rev it to around 2000rpm & then take my foot off it makes a quite loud rattle/ vibration from under cambelt cover.This goes away as it gets to 1200 or so rpm. First noticed this after cam belt change 50000km ago. took back to workshop where they pulled it apart & found nothing wrong. It sounds like the belt is vibrating. Am pulling apart today but thought maybe one of you pros would probaly know striaght away what problem is. Thanks

Brent

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https://www.sau.com.au/forums/topic/422185-noise-from-front-rb25de-engine/
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Did you replace the cam belt idler tensioner and pulley. Bearings can wear out.

Check the air con belt and pulley.

Check the harmonic balancer. and altenator belts and bearing

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