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Knocking on overrun?

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I'm going to look at a Corrado G60 on Saturday, the guy says it's in good mechanical condition except there is a knocking sound on overrun (aka engine braking, aka when you lift your foot off the throttle).

 

Is this a common problem? Any ideas?

 

I would expect rod knock on acceleration (under load) not on overrun.

 

Thanks!

Skye

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Could be the exhaust knocking on the body somewhere when the engine flexes in the enginemounts on overun, or maybe a mount itself complaining...

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Turns out it was the front left suspension bushings are shot.. clunk on accel/de-accel. From what he described I was expecting rod knock - apparently its common on 'rados when crusing at 2500-3500rpm

 

Skye

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