Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: Martin_1962 on 16 April 2010, 23:35:41

Title: Funny knocking noise
Post by: Martin_1962 on 16 April 2010, 23:35:41

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?

Title: Re: Funny knocking noise
Post by: Entwood on 16 April 2010, 23:38:37

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

Title: Re: Funny knocking noise
Post by: tunnie on 16 April 2010, 23:41:58

exhaust manifold?

Title: Re: Funny knocking noise
Post by: Martin_1962 on 16 April 2010, 23:42:53

Quote

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

Title: Re: Funny knocking noise
Post by: Martin_1962 on 16 April 2010, 23:43:13

Quote

exhaust manifold?

Not blowing, more a thumping noise

Title: Re: Funny knocking noise
Post by: tunnie on 16 April 2010, 23:44:59

does it knocking increase in frequency with more revs?

Title: Re: Funny knocking noise
Post by: Martin_1962 on 16 April 2010, 23:54:31

Quote

does it knocking increase in frequency with more revs?

Only at idle

Title: Re: Funny knocking noise
Post by: feeutfo on 17 April 2010, 00:11:54

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?

Title: Re: Funny knocking noise
Post by: tunnie on 17 April 2010, 00:14:06

maybe pop aux belt off see if its still there?

Title: Re: Funny knocking noise
Post by: Martin_1962 on 17 April 2010, 11:34:21

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

Title: Re: Funny knocking noise
Post by: dbug on 17 April 2010, 13:44:32

Quote

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

Cured it then  ;)

Title: Re: Funny knocking noise
Post by: Rockhampton on 17 April 2010, 13:59:59

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!  :D