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[RobG]

I do lose a small amount of coolant.
I need to top up about every month (1500 miles).
How is this linked to petrol but not LPG?

Possible head gasket leak & coolant entering bore/s hence lumpy initial start-up

[Marks DTM Calib]

To little coolant loss to be honest.....cam sensor can cause similar issues

[RobG]

To little coolant loss to be honest.....cam sensor can cause similar issues

Quite possible. IIRC OP was having cam sensor problems. Pigtown, did you get round to changing the sensor when Nigel (Entwood) read your codes :question

[tunnie]

As Rob mentions above, i was wondering if coolant was entering the cylinder bore's as that was the early symptoms on father T's 2.2 failing, it would splutter on start-up, but soon clear, as it burns off the fluid. But as its every 1,500 miles thats not enough to indicate that kind of issue

[pigtown]

I hope it's not the headgasket and the fact it runs well as soon as I switch to LPG I think discounts that.

RobG I forgot about the cam sensor fault Nigel picked up. We thought it was a rogue reading as it only showed once and at the time I never had this problem.

I think I'll get a new cam sensor at the weekend!
I'll update as to if that fixes it.

[pigtown]

Fitted a new cam sensor and it worse than ever!
Now wants to pull away in top gear and throttle doesn't always respond. Now undriveable!
I bought the sensor from vauxhall-car-parts.co.uk as it advertised genuine vauxhall parts. I am suspicious as the original had a GM mark but thie new one has none at all.
I'm going to have to put the old one back on and start again....

[mathewst]

This probably is not the genuine cam sensor.
The same thing happened to me, I got a sensor error put a replacement one and the car became  nondriveable.
Read somewhere that cat problems can cause issue with cam sensor.
How much did you pay for sensor?
2.2 ones are expensive (in excess of 60 quids)

[pigtown]

I paid £50 and it was advertised as genuine so if it isn't i will be having words with the supplier!

Just tried disconnecting it and the car runs the same (bad) with NO sensor.

[mathewst]

Apparently replacement sensors work more or less fine on other engines but don't work at all at 2.2.

[vic]

Sounds identical to the problems I chased round my Omega for weeks. Rough tickover can be caused by a failing MAF. To check when cold switch off ignition, disconnect MAF and fire up again if it ticks over better then suspect the MAF (if you decide to replace only use genuine GM part though) Stealers prrice circa £112 bu you can source genuine elsewhere for £65 if you shop around.Tickover usually improves once the lambdas go closed loop after about two/thre minutes, which is why it only appears after start up. I replaced the cam sensor on mine, the part No for genuine part can be seen in this how to;
http://www.omegaowners.com/forum/YaBB.pl?num=1269023974
I would also check plug wells for oil or water, in the case of water check pots nearest skuttle. A leaking windscreen rubber allowed water to drip into mine. I hade recently removed the skuttle to attend to a blocked drain and wayward powersounder and hadn't reseated the screen rubber properly,once sorted, no problem. The MAF check is a no cost option so worth ten minutes to check it out as is the water in plug wells which can be sorted for a squirt of silicone sealant.
Hope you get it sorted
HTH
VC

[pigtown]

I replaced the cam sensor with a genuine one. Now runs again but the original problem remains.
Tried disconnecting MAF and after an initial splutter seemed to tick over better but not sure so will try again. once it's run for a few minutes it's ok so can't try again straight away.

[mark.adams]

I'd just like to second the only buy genuine MAF's, i tried a copy one, it ran as rough as a dog then backfired and blew the sensor straight off the side so i sent it back. One genuine MAF later and perfect running again...