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Everyone in the know is expecting Rishi to announce this very shortly.

OOPS

He's doing it right now

This is on my step daughters 2001 Volvo C70 with a 2.4 low pressure turbo petrol engine and manual gearbox.Sometimes it will start straight away but most of the time the engine will turn over and occasionally "lock up" [as though a cylinder is flooded]for a split second before continuing to turn over.Once it does start it ticks over evenly and revs cleanly driving exactly as it should.Reading the codes with a cheap reader brought up P0014[cam timing advanced]but the car shows none of the running issues associated with that code.The rear [exhaust?] cam has a hub [vvt?]on it.We've fitted a new crank sensor to no avail .When cranking the rev counter needle will at times flick from zero to about 2,500 revs before instantly dropping back to zero but it doesn't do this with any regularity.Firing the parts cannon at it is not an affordable option. Any ideas as to where/what to look at? TIA.

I had exactly the same but on a 3.2. It began with intermittantly not cranking, but after a vouple of attempts would then crank / start, until it got to the point of being totally 'dead'. Replaced the crank sensor and it started every time afterwards.
But remember - you have to buy a genuine crank sensor from genuine dealer that you genuinely have to walk into and genuinely approach the parts counter and pay the genuine parts person for the genuine part.....
But there are other sources for genuine Bosch parts who made the genuine GM crank sensor for that era of Omega

As I said, I do have one spare BOSCH 0 261 210 131 from a 3.2L that I scraped a couple of years ago. This one fit the block serial number I have.

But I will buy one anyway to have as a spare, good to have when it is needed.

I had exactly the same but on a 3.2. It began with intermittantly not cranking, but after a couple of attempts would then crank / start, until it got to the point of being totally 'dead'. Replaced the crank sensor and it started every time afterwards.
But remember - you have to buy a genuine crank sensor from genuine dealer that you genuinely have to walk into and genuinely approach the parts counter and pay the genuine parts person for the genuine part.....
But there are other sources for genuine Bosch parts who made the genuine GM crank sensor for that era of Omega

Thanks,

I got the same advice from our Swedish Opel group on Facebook.

I have one spare crank sensor and I'll change it tomorrow.

Inundated.

When my Omega[a 3.0 V6] had the same issue it was the crankshaft sensor,and apparently this doesn't always throw a code.

My 20 year old V70 started first time yesterday after lying dormant and neglected for 5 weeks or so. 

My youthful 16 year old Mondeo had a flat battery and required jump starting off its elderly stable mate, and was reluctant to rise from it's slumbers. 

Never mind an Italian tune up will sort it out next week!     

Yesterday my 2.6L Omega just died on me when turning in to a parking lot. Then totally dead, wouldn't start.
Called a neighbour that has a tow truck and she came and picked me up. When we have unloaded at home it started without any problem.

I assumed it was the fuel pump that had gone bad and replaced it this morning, I had a spare on the shelf.

Took it for a drive now (about 25 miles) and when almost at home it died again, in the same way. No fault engine lamp, just looks normal but wouldn't start. I waited about 15 minutes and it started up looking good.

Drove it home and checked for codes and nothing at all.

I'm confused, it is hard to know what could have gone wrong. We have kind of warm weather now but it is only about 20°C so wouldn't cause anyhting.

But apparently something shuts off and is OK after a while when it has cold down a bit.

Some sensor that is faulty?

The newest of my three cars is 17 years old. 

My old Vauxhall is also 17 years old.

Edited for clarity.