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[New POD]

After a weekend of rain, followed by 150 miles on the motorway in the rain, followed by All of yesterdays rain, my MV6 is very rough below 3000 rpm.  If I chuck it into sport mode it's fine at higher revs.

Is this old fashioned damp? or is it something like erm crank sensor ? 

[tidla]

Scuttle leaking onto the coil pack/packs

[New POD]

Scuttle leaking onto the coil pack/packs

That makes more sense. It's dark, I'm in a shit hotel (until friday morning) 6 miles from Derby on the A50 and when I get up to go to work it will be dark, but hey, it'll be fine. It's made me grumpy.

[Steve B]

There you go...  that is what you need to do once you have removed the scuttle.

http://www.omegaowners.com/forum/index.php?topic=128823.0

[johnnydog]

I had exactly the same symptoms with my 2.6 last November after all that heavy rain which caused a bad misfire. Foam was soaking under the scuttle trim panel on the passenger side. Took both coil packs out, and both banks were swimming in water in the plug holes; the nearside far worse than the offside. The coil packs were quite corroded and had hairline cracks in them. Two new coil packs, a set of GM plugs and a bead of sealant as recommended in the guide, and it has run perfectly ever since and the foam has remained bone dry. Whilst you are on with the job, I'd just check that your scuttle drain hole under the pollen filter is clear, otherwise you may end up with a wet passenger footwell, followed by a knackered heater fan speed controller (hedgehog).

[Doctor Gollum]

Removing the foam from under the centre of the scuttle is probably the most efficient fix...

Sure sealant will keep the end of the foam dry, but removing it entirely stops it from soaking up moisture like a, er, sponge

[anV6]

So is this one of the common problems with the Omega? Or isolated incidents? I mean should you seal the scuttle or remove the scuttle foam if it hasn't been done by the prior owner?

If so, Opel/Vauxhall should have put a warning sticker on the door saying "Do not drive in rain", like Chrysler did with the Viper.

[Nick W]

So is this one of the common problems with the Omega? Or isolated incidents? I mean should you seal the scuttle or remove the scuttle foam if it hasn't been done by the prior owner?

If so, Opel/Vauxhall should have put a warning sticker on the door saying "Do not drive in rain", like Chrysler did with the Viper.

It is a common problem, but like the cam cover gaskets only starts as the car ages.

You can seal the scuttle, but as it needs to be removed to access the back of the engine removing the foam deals with almost all of the problem.

[anV6]

So is this one of the common problems with the Omega? Or isolated incidents? I mean should you seal the scuttle or remove the scuttle foam if it hasn't been done by the prior owner?

If so, Opel/Vauxhall should have put a warning sticker on the door saying "Do not drive in rain", like Chrysler did with the Viper.

It is a common problem, but like the cam cover gaskets only starts as the car ages.

You can seal the scuttle, but as it needs to be removed to access the back of the engine removing the foam deals with almost all of the problem.

And removing the foam won't cause any other problems? Because if it's not needed why did they put it there in the first place?

[Doctor Gollum]

Sound proofing. Removing it makes no noticeable difference to cabin noise.

[anV6]

Sound proofing. Removing it makes no noticeable difference to cabin noise.

So it was never needed in the first place it seems.

[driver115]

had the same problem with my 2 omegas over the years, replacing coil pack sorted the problem, some silicone sealant or similar to reduce /prevent water seeping into/under the scuttle via the windscreen washers/surrounding area, and dripping onto the coil packs/as suggested remove foam , and make sure the scuttle is clear of leaves and front wheel arch drain points are open using a wire coat hanger or similar

[Doctor Gollum]

This affects four pots as much as the V6, especially if the scuttle isn't sealed properly... basically the foam absobs moisture to the point of saturation and then the fun begins.

Removing the foam basically eliminates the problem, and even on an unsealed scuttle, any water simply drains down the face of the bulkhead without actually collecting anywhere.

[tidla]

Yep, no foam on mine.

[robson]

where are the front wheelarch drains?