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1

Omega General Help / Re: Hunting a wheel wobble

« on: 09 April 2025, 11:35:08 »

Thank you for confirming. Idler arm is what I meant by ‘steering drop arm’. I could see it’s bushed one side.

I’ll get that replaced and start building up a front suspension refresh kit in the meantime.

Cheers for the advice

2

Omega General Help / Hunting a wheel wobble

« on: 09 April 2025, 11:07:59 »

Morning chaps,

Slowly working getting the Omega to drive as well as it's 60,000 miles and clean bodywork suggest it should.

Latest thing I'm working on and genning myself up on is Omega suspension bushings. I have a wobble at around 45-60 and also a vibration through the steering when braking.

The discs and pads are getting changed regardless just because maintenance and I'm getting the balancing on the wheels double checked unrelated to this.

What I've found in terms of movement with the car up in the air is in the steering rack/arms. If you wobble the NS wheel holding it at 9 and 3 position there is a good amount of movement around the steering drop arm, what bushes are likely to cause this? I know the arm itself is bushed at one end, is there anything else on the rack that is a usual culprit to cause a couple of mm of play with the wheel in the air - or is this level of play expected?

Pictured is what looks like where the most amount of movement is happening.



I've had a search around this topic on the forum, couldn't find anything too relevant, apologies if this has been covered a thousand times.

3

Omega General Help / Re: Y26SE - starting then dying

« on: 06 March 2025, 16:37:51 »

great news and thanks for the update . nice to know it may be fixed . the pipes rusting through there are a common issue .  too many people on forums come on and ask for help never to be heard from again until the next problem !   cheers .

Just to clarify the issue was with the rubber pipes in the tank - the feed from the top of the pump to the metal fixings.

Put 50 miles on the car today and all seems well...apart from the other 'lack of use' stuff to get to with the car, but that's another story.

4

Omega General Help / Re: Y26SE - starting then dying

« on: 05 March 2025, 17:04:12 »

Right - update time, cos everyone hates those threads where a problem is highlighted only to never see a resolution.

Was the car scrapped, did it live on the drive for the remainder of earth's days or was it in fact fixed?

After weeks of back and forth with this thing and putting it off because I had use of another car I finally got round to working through possible culprits.

First off was to get that fuel filter replaced - helpfully the fuel filter to main fuel lines under the car snapped upon fitting the new filter but that's fixed and the fuel filter was on. To no avail - still same issue. Relays were checked, replaced anyway with new genuine ones - still to no avail.

I had already done the camshaft sensor so decided to get a new Bosch crankshaft sensor on 'while I'm there' as they seem to be a known weakpoint on these, changed nothing.

Finally got the new fuel pump I had sitting around and decided to crack open the fuel tank and get that in - where I found the culprit, the fuel line from pump to tank cap was original and in a bad way with cracks and gashes all over it. It looks like it was enough to prime and run what was in the line but then couldn't keep supplying fuel at the right rate.

Changed the pump while I was there anyway, changed the line and buttoned it all up.

It's now running *touch wood* nicely and I'll take it for a proper shakedown once I've buttoned up everything under the bonnet and in the boot.

5

Omega General Help / Re: Y26SE - starting then dying

« on: 10 February 2025, 09:40:40 »

Have you had any of the Vacuum pipes off, or removed the intake and replaced the vacuum pipes wrong or the plug on the back of the plenums..

No, none of these have been touched since I bought the car and it was running (with aforementioned hesitation issues)

6

Omega General Help / Re: Y26SE - starting then dying

« on: 08 February 2025, 17:05:49 »

Just saw your post Doctor G - another great shout, will take a look what’s going on there too.

It definitely feels like it’s running on some kind of enrichment mode and then not switching over thus flooding/killing the spark.

7

Omega General Help / Re: Y26SE - starting then dying

« on: 08 February 2025, 17:03:52 »

Thanks Nick, I’m agreeing more and more with you on fuel delivery checks.

I’ll see what data I can get in terms of fuel rate while it’s running.

I’ve chucked another 20l of E5 in there and it ran noticeably longer than before, like 30seconds instead of 10 - I’m tempted to whip the in-tank pump out (presuming there is one there) and double check what’s going on in there along with your other suggestions.

Is anyone aware of any funky relay on these that controls some kind of cat warm up cycle when cold that then switches? The cut off is just ‘too’ perfectly timed to not be suspicious for me.

Will report back once I’ve done some more fiddling.

God I’m loving being back in retro cars again 

8

Omega General Help / Re: Y26SE - starting then dying

« on: 07 February 2025, 13:16:13 »

Petrol is fresh E5 and there's plenty of it, it's definitely not what's in the tank - could yet be delivery of said petrol, whether there's enough at prime to run faultlessly with no more then being delivered.

Thanks for the input Nick - I'll take a look at air leaks, but I've yet to come across a running issue this catastrophic and repeatable where air leak has been to blame, however I won't write it off and will dig around.

With ignition hardware I still can't see how it would run *so* well for 10 seconds then die off, I've had degradation of coil packs before and with other brands they either start or don't start.

If this was rough running I'd agree with your pointers completely - but it's very exact, repeatable dying after a set time frame of nice running.

9

Omega General Help / Re: Y26SE - starting then dying

« on: 07 February 2025, 11:54:37 »

To pre-empt what I can see is a usual follow up question I've had a look at the live data for the brief period of running (while cold - so on open loop) and I can't see any trim levels reporting for Bank 1 or 2. 0% across both while showing 0.44/0.45 volts across either.

10

Omega General Help / Y26SE - starting then dying

« on: 07 February 2025, 11:45:33 »

Morning all, getting to know the Omega I have just purchased and getting on top of maintenance etc - the sort of stuff that builds up with a car when it's been largely sat for the past 5 years.

One of the issues that I'm dealing with which started with a bit of hesitation between 2-3000 rpm has turned into something a bit more serious. The car will fire up and run for maybe 5-10 seconds, rev fine then proceed to slowly chunder to a halt with some rough running and eventually dying completely. It'll then start fine but repeat the above over and over.

After purchase a couple of weeks ago I put a good, new Bosch battery on it and sourced a battery clamp/tie down that was missing - it then started hesitating on start up taking several seconds of cranking to start and would then be lazy in the aforementioned 2-3000 rev range before the non-running issue started earlier this week.

I've sourced a new off-brand cam sensor because I could get one quickly and this has removed the slow start issue but not solved the cutting out after 5-10 seconds. I have a new (to me) potentiometer/pedal assembly on the way to A/B test as I've read these can be a failure point.

The last code read it threw up came back with the usual P0173 and P0170 malfunctions - it's thrown no further codes during the current non-running.

For the first 5-10 seconds of running it runs beautifully and responds to throttle inputs perfectly - until it doesn't.

I get that playing parts bingo isn't smart - but if there are some well known causes of the above symptoms to at least point me in the direction/diagnostic of, I'd appreciate it. Again - new to the world of modern Vauxhalls so don't really know the engine platform that well.

My next step is smoke/air leak test - but I can't initially hear a catastrophic enough air leak when running that would cause the car to shut off to this extent.

Input and potential ridicule always welcome.

11

Omega General Help / Re: Front strut difference between Saloon and Estate

« on: 03 February 2025, 14:39:38 »

Thanks for the replies all, incredibly helpful.

I always tend to lean towards coilovers where possible for adjustability (both of height and spring rate if needed) and quality of ride. I do want to go a tad lower sometimes than the preset 30mm that most spring kits will allow and also am aware that the front shocks could do with changing being original items - so this is a handy way to achieve both. The Bilstein/Eibach combo is usually my favoured for non coilover applications but Eibach don't list the Sportline kits for Omegas so that seems a no go.

I'm not so fussed on rear as I'll just source shocks to measure to match a pair of rear springs that achieve the ride height I'm after.

Again, thanks for the help and I'll get some pics in the Newbie section once it all comes together

12

Omega General Help / Front strut difference between Saloon and Estate

« on: 03 February 2025, 11:52:07 »

Hello fair members of OOF, I've just found myself a 2001 2.6 Estate and am doing some light recommissioning on it.

One of the items on the list is suspension, specifically coilovers. Options for these are predictably limited but I have found some fairly good options for Saloon applications (this is front struts specifically) less so for Estate.

I've had a search through the forum but can't seem to find an answer to whether the front units differ between otherwise identical spec Estate or Saloon.

I.e. would front struts listed for a 2001 Omega 2.6 Saloon (in theory) be the same as the front struts listed for a 2001 Omega 2.6 Estate.

My recent background has all been BMW - where I'd just look up parts numbers/cross fitment on RealOEM but I've not been involved in Vauxhalls for over 10 years so not sure on similar resources.

Anyway - thanks for any help and I'll get some pictures up in the Newbie section once I've done my fettling with it.