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[Martin_1962]

When parking up I can hear a bit of a knock, get out of the car and under the bonnet, no noise, definately NOT big ends or top end.

About 3 or 4 times a second.

Any ideas anyone?

[Entwood]

Exhaust vibrations touching something ??  Happens if the hangers are old and FUBAR'd .. ?? 

[tunnie]

exhaust manifold?

[Martin_1962]

Exhaust vibrations touching something ??  Happens if the hangers are old and FUBAR'd .. ?? 

Possibly - just that after TBs problems I am being very careful.

Will be buying a new idler soon as mine is noisy and was dry - greased earlier

[Martin_1962]

exhaust manifold?

Not blowing, more a thumping noise

[tunnie]

does it knocking increase in frequency with more revs?

[Martin_1962]

does it knocking increase in frequency with more revs?

Only at idle

[feeutfo]

might have something similar on mine, mentioned it to Kevin who said his is the same. Suspected the ac pump but really not sure tbh. Does the vibration of the engine match the noise?

[tunnie]

maybe pop aux belt off see if its still there?

[Martin_1962]

Engine doesn't seem to vibrate, and didn't do it today

[dbug]

Engine doesn't seem to vibrate, and didn't do it today

Cured it then 

[Rockhampton]

I sometimes get that as well - only at idle though, and not always. Had a listen, and it seems to be coming from the aux belt area, on the A/C side, no noise from idler. Air on or off does not change it though. Walk around to the offside and can hardly hear it. It's not really loud or anything, and does not sound metallic - again, just started the car from cold now and it is not there at all. Wierd!