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20valver

strange exhaust noise

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right its a bit of a tricky one to explain this.....

 

its a vurmb,,, vurmb,, vurmb, vurmb vvvuuuurrrmmmbbbbb noise.

 

it seems to get louder and more defined as the engine gets hotter.

 

it's a lot more obvious when you plant the accelerator

 

it occurs between 1200 and 2500rpm

 

at 1200rpm it has about a 0.7 second gap between vurbm noises

 

gap decreases progressivly until 2500rpm where it just blurs into one continuous vurbm noise.

 

any theories out there? or ring a bell with anyone?

 

any help much appreciated...

 

 

92' G60

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