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Omega General Help / Re: V6 2.5 Sounds like blowing manifold when cold?

« on: 08 October 2007, 20:37:52 »

Thanks to  all members who offered suggestions.  I've followed  some up.  Seems you have to be careful with aftermarket/pattern exhausts. Leson here is  to buy the VX bits I suppose.   I think we've pinpointed the front blow to be a gasket type on the manifold to downpipe - looks like there was a change after '99 and mine's an 01 and has a different type of gasket there -I checked that with VX and I'm going to follow that up, before I go for the manaifold gasket - that's a 4.5 hour job...

The real shocker was that the nearside middle box fitted by Kwik Fit is of a different type to the offside (they did both)and this nearside box has failed in two weeks.  It's warrantied so they're changing it for the same manufacturer as the offside. That will at least make the car sound right!

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Omega General Help / V6 2.5 Sounds like blowing manifold when cold?

« on: 04 October 2007, 12:48:14 »

Hi all  - has anyone got any experience of this? I've had  a couple of exhaust problems  which this  forum has helped sort out.  I now have a completely new exhaust system.  

However, when the  car starts from cold it sounds to growly for a smooth V6.  Sounds like a blow,  but as the  car warms up to operating temp, the noise goes and it sounds OK,  but I don't think that's  right.  Could it be a  gasket, or manifold.  This is 2001 V6 2.5 and sounds like its on the lower left (viewed from front) passenger side. Thanks Stig :-?

3

Omega General Help / Re: V6 Auto Lurching at Low & High Speed

« on: 22 September 2007, 07:12:38 »

Here's where we are now - after checking TPS etc still same probs so arranged for hook up and tech tests.  This proved MarksDTM original theory in my first post (see V6 Exhaust Blowing) that the  secondary air injection system pipes were melting and car lurching, because cat(s) were blocked and gasses were coming back into the injection system and bursting those two pipes - drivers side and the one front passenger side just by auxilliary drive belt. Both cats were replaced yesterday and now car is really performing well - no surprise!  

Car's had the last laugh though  -got back lat night and driver's door has deadlocked itself - can't see any way of opening  that so it'll prob be  a VX job!

4

Omega General Help / Re: V6 Auto Lurching at Low & High Speed

« on: 21 September 2007, 07:43:35 »

Thanks Dave , I'll check that out. Read up about them last night and looks like a possible source of  the  trouble, so that's today's job, plus  change fuel filter as that's recommended by lots of forum members.

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Omega General Help / Re: V6 Exhaust Blowing

« on: 22 September 2007, 07:15:48 »

Same probs continued - lurching/misfire/lack of power at low speed/secondary intake rubber pipes bursting etc so arranged for hook up and tech tests.  This proved MarksDTM original theory in my first post (see V6 Exhaust Blowing) that the  secondary air injection system pipes were melting and car lurching, because cat(s) were blocked and gasses were coming back into the injection system and bursting those two pipes - drivers side and the one front passenger side just by auxilliary drive belt. Both cats were replaced yesterday and now car is really performing well - no surprise!  

Car's had the last laugh though  -got back lat night and driver's door has deadlocked itself - can't see any way of opening  that so it'll prob be  a VX job!

6

Omega General Help / Re: V6 Exhaust Blowing

« on: 19 September 2007, 16:18:32 »

Cheers for the tip.  I had the section replaced as it  was looking dodgy too.  Did  a rattle test on the cats and no noise so honeycombs were ok.  Fortunately they were able to get the centre section joints at the cats undone otherwise I was looking at  hundreds of quid.   Was still noisy though,  and on further investigation the second EGR rubber pipe at the  front right (passenger side) was split too, I've just changed that and it was a really awkward job - now got a sore arm and no skin on knuckles, but at last V6 sounds sweet. Got an emissions test done too and all clear - phew!

Still a bit of a mystery though as to why those rubber hoses split/melt.  I wondered if  it was because I hade replaced one, before the boxes were changed and the other was already split,  so perhaps they have to be changed in pairs? The device they connect to looks as if it does something with vacuum or temperature.  I'm not sure this has fixed it for good - I'll keep a close eye on them...

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Omega General Help / Re: V6 Exhaust Blowing

« on: 19 September 2007, 08:22:34 »

Thanks for the advice.  Just looked again and the new EGR rubber pipe has split again after 500 miles! What's causing that? Problem with the Cats or the Valve itself? Ta

8

Omega General Help / V6 Exhaust Blowing

« on: 18 September 2007, 21:30:07 »

Hello all,  I'm  a new boy and also new to owning an Omega.  My V6 Estate (Auto) was making an exhaust blow noise from driver side and this  turned out to be one of the small rubber hoses that connect the EGR pipes to the valve whic had split.   Replaced that and all OK,  back box on the exhaust blowing so replaced,  but now sounds like perhaps a manifold gasket leak on the passenger side up front. Any  experience of this? I heard gasket failures are common on these..thanks Stig