Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: mobby.6kl on 13 September 2009, 11:03:09

Title: Strange pulsating noise at low speed
Post by: mobby.6kl on 13 September 2009, 11:03:09

Looks like it's time for another problem. Since the last time I posted with a problem here, I had the rear left wheel bearing replaced, and the headlight leveling system reported an error but then somehow fixed itself  :)

Now there's another problem. From about 20 km/h there's a weird, pulsating noise coming from somewhere which is probably the loudest at around 30km/h, but then quickly disappears as I accelerate. It's hard to describe, as I said it's pulsating, as if something was grinding only at a particular spot during rotation. The noise appears to be dependent on road speed and not engine speed, as I can let it drop to ~1k RPM when going downhill or coasting to a stop.

I tried to record the sound with my phone, so hopefully it's good enough to hear what's going on.
Download the mp3 here. (http://mobby_6kl.s3.amazonaws.com/noise.mp3)
 From a complete stop I slowly get up to about 25-30 km/h and stay there for a bit (from about 8-10 seconds), then accelerate to about 70 just to see that the noise isn't there. You can also heart it at the very end when I slow down into a turn. The noise isn't necessarily as loud or as quiet as it might sound, as I messed with the volume in a sound editor.

To me this sounds nothing like how the bearing did, although I didn't get to try the usual tests (sharp turns, etc). There are also some quite ticking noises at the beginning, but I suspect that's just the key chain banging on something. The car is a 2001 Caravan 2.2 automatic, with about 145k km. So, any suggestions what might be causing this, or what can I do to try to find out? Thanks.

Title: Re: Strange pulsating noise at low speed
Post by: Selseybill on 13 September 2009, 11:44:52

i had the same ticking noise on a london taxi i used to own.if sounded like there was stones stuck in the tread then started to droan .turned out to be a wheel bearing in the end or should i say what was left of it

Title: Re: Strange pulsating noise at low speed
Post by: Ghost on 13 September 2009, 12:45:10

Sorry mate I cant here any noises apart from the ones your making,
Have a good look at all four wheels and round them see if theres anything that looks or feels odd.