Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: omegadan2.2i on 19 August 2007, 14:13:33

Title: Rattle on start up - 2.2i
Post by: omegadan2.2i on 19 August 2007, 14:13:33
Started up my Omega this morning and was greeted by a horrible rattling from underneath (sounded like marbles rattling in a tin!!) >:

Quick scrabble on the floor and it sounds like it is coming from the middle section of the exhaust, near the cat.  Exhaust still looks good and from what I can see.

The noise disappeared once the car was warm.  I am hoping that this in not the cat!! >:(

Any ideas anyone???

Dan
Title: Re: Rattle on start up - 2.2i
Post by: Auto Addict on 19 August 2007, 16:35:35
Did the car idle properly when it was cold?
Title: Re: Rattle on start up - 2.2i
Post by: IrmscherKris on 19 August 2007, 17:01:27
Timing chain these are, arnt they?
Title: Re: Rattle on start up - 2.2i
Post by: Vauxhall Omega on 19 August 2007, 17:08:11
Yes they are a chain
Title: Re: Rattle on start up - 2.2i
Post by: batista on 19 August 2007, 17:20:08
baffles probably collapsed.i would part the centre box from cat then start it up,it will sound loud but tell you wether it is the cat or middle box.
Title: Re: Rattle on start up - 2.2i
Post by: omegadan2.2i on 19 August 2007, 17:21:31
Quote
Timing chain these are, arnt they?

AA - I did try it again later (when cold again) and I did notice that the engine was idling higher than normal
Title: Re: Rattle on start up - 2.2i
Post by: Taxi_Driver on 19 August 2007, 19:47:42
Quote
Yes they are a chain

If its a 2.2 petrol.....then its a belt.....cambelt kit to be fitted every 40k  :y along with water pump imo  :y
Title: Re: Rattle on start up - 2.2i
Post by: Auto Addict on 19 August 2007, 20:18:56
Quote
Quote
Yes they are a chain

If its a 2.2 petrol.....then its a belt.....cambelt kit to be fitted every 40k  :y along with water pump imo  :y

As TD says, no chain, belt on 2.2's
Title: Re: Rattle on start up - 2.2i
Post by: Auto Addict on 19 August 2007, 20:22:32
Quote
AA - I did try it again later (when cold again) and I did notice that the engine was idling higher than normal

The reason I asked, was it firing on all cylinders when this happened?




Title: Re: Rattle on start up - 2.2i
Post by: omegadan2.2i on 19 August 2007, 21:31:59
Quote
Quote
AA - I did try it again later (when cold again) and I did notice that the engine was idling higher than normal

The reason I asked, was it firing on all cylinders when this happened?






Yes, firing on all cylinders, but I have noticed of late that cold starting although idle is constant, feels slightly 'lumpy'.  Performance is also recently been a bit 'flat'.  All breathers and DBW throttle valve clean.  I was waiting to take to MDTM when he returns from holiday for him to have a look at it then this happens!!! :(

Dan
Title: Re: Rattle on start up - 2.2i
Post by: TheBoy on 19 August 2007, 21:53:10
Quote
Timing chain these are, arnt they?
Nope.

All Omega Petrols are belts, and have 40k/4yr life.
Title: Re: Rattle on start up - 2.2i
Post by: omegadan2.2i on 21 August 2007, 21:44:52
Had another check today and got a couple of expert opinions - now 99% sure it IS the cat!!!! :( :(

This has probably been caused by driving through recent floodwaters, the water cooling the outer casing quickly hence 'crushing' the outer edge of the expanded ceramic monolith causing fracture!! :( :(

So, a couple of questions before I get it fixed:

1)  Am I best to get a genuine GM replacement OR is a pattern equivalent as good (these seem to range from about £100+ VAT on the net).  If the GM original is the way to go, how much are these on TC?

2)  Could I use a secondhand one off a scrapper (which would save me money) or is this false economy?

3)  Is the cat part of the front pipe or is it a separate bit?

Don't trust many of the 'fast fit' outlets so would rather get my own parts, and have a good mate who can fit it!

Any advice/help would be greatly received!! ;D

Thanx
Dan
Title: Re: Rattle on start up - 2.2i
Post by: Sir Gingerlot on 21 August 2007, 22:00:18
Having used an aftermarket CAT on my 2.0l last year I would recommend a genuine VX. This exhaust had made my car sound rough and not its previous quiet graceful self. The one I fitted was made by Bosal which I beleive a number of garages and parts suppliers use. Stick to genuine.