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[Nick W]

Also with the 2.6 use superunleaded petrol, not the cheaper stuff....

I've some snake oil he could rub on the OSR tyre valve that's guaranteed to cure all misfires and bring about world peace.

Is there really any need for a comment like that....?

Im just going from experience and offering advice, theres no need to be a complete arse about things...

You're right, my derision is based entirely on my experience that the only engine that Superunleaded petrol made a noticeable difference to was a 1.8GDI Mitsubishi. The only difference it makes to my 3.0 is to cost more.

I am curious how it would help with Terry's faulty ignition components?

[minifreek]

It was the Vectra Facelift GSi 2.6 V6 that would have problems with a misfire when ignition systems was completely replaced, last thing that cured it was running SuperUnleaded....

Turns out that the OP has cured the problem with a misfire by changing the plugs for new...

There was no need for a flippant comment, when all that was suggested was a bit of advice and a suggestion to change the fuel type....

[GrahamT]

I don't notice any performance difference but I definitely get better mpg using shell optimax unleaded.

Problem is it still works out more expensive than normal unleaded.

Mines a 2.5v6

[New POD]

Remove both packs, remove all plugs, replace all plugs with NEW, clean coil pack sleeves,
Don't use petrol use carb/brake cleaner. If fault re-appears, then coil pack at fault.

This.


Plugs don't like being soaked in oil, and at £2 each plus the faffing about changing them are not worth trying to save.
Petrol is not a good degreaser; brake cleaner is about £2 a can at ECP and is a much better bet for small jobs. DIY use means even a small can is good value. For large or really dirty parts, I scrape the worst off, then use cheap cellulose thinners in a washing bowl/old bucket/whatever container and a couple of scrubbing brushes from Poundland.

My most recent Vx Trade Club catalogue is dated 2010, there plugs are between £2 and £3 each, presumably cost more now. I see them on e-bay at below £2 each, at which price it is clearly worth stocking spare sets. There are some brands I have never heard of there, but Bosch and NGK are there. I shall stock up.

I was quoted 55 quid for 6 plugs Via Trade Club for an 3.2 yesterday from Lookers Liverpool. I declined. I assume there's a cheaper alternative.

[Nick W]

I was quoted 55 quid for 6 plugs Via Trade Club for an 3.2 yesterday from Lookers Liverpool. I declined. I assume there's a cheaper alternative.

Cheaper? I think you would have to work hard to find a more expensive alternative!

Plugs are a standard consumable, readily available from a multitude of sources. A quality brand is going to cost less than a fiver each at retail prices, less any discount you can wangle. My local branch of ECP charge about £2.50 for Bosch plugs in such circumstances - your engine won't care that they don't have GM printed on them.

[TheBoy]

Remove both packs, remove all plugs, replace all plugs with NEW, clean coil pack sleeves,
Don't use petrol use carb/brake cleaner. If fault re-appears, then coil pack at fault.

This.


Plugs don't like being soaked in oil, and at £2 each plus the faffing about changing them are not worth trying to save.
Petrol is not a good degreaser; brake cleaner is about £2 a can at ECP and is a much better bet for small jobs. DIY use means even a small can is good value. For large or really dirty parts, I scrape the worst off, then use cheap cellulose thinners in a washing bowl/old bucket/whatever container and a couple of scrubbing brushes from Poundland.

My most recent Vx Trade Club catalogue is dated 2010, there plugs are between £2 and £3 each, presumably cost more now. I see them on e-bay at below £2 each, at which price it is clearly worth stocking spare sets. There are some brands I have never heard of there, but Bosch and NGK are there. I shall stock up.

I was quoted 55 quid for 6 plugs Via Trade Club for an 3.2 yesterday from Lookers Liverpool. I declined. I assume there's a cheaper alternative.

I suspect you're being charged retail price, not TC.  From memory, quads are just under £4, twins (my preferred, mostly due to LPG) nearer £3.

[terry paget]

Looking more carefully at the pictures of the cheap Bosch and GKN plugs I have ordered, I suspect they are all single electrode.

[YZ250]

.......
 Yesterday morning I read codes, got PO300, PO306. I removed plugs 1-3-5,
..........
I wonder what failed first. Was it oil in no. 3 (plug came out looking OK), or dirty no. 6? Might the plug stick have failed on no. 6? ............

Just out of curiosity Terry, when P0300 (random misfire) and P0306 (fault on cylinder 6) showed up, why did you remove 1,3,5 bank plugs instead of the 2,4,6 bank?

[terry paget]

.......
 Yesterday morning I read codes, got PO300, PO306. I removed plugs 1-3-5,
..........
I wonder what failed first. Was it oil in no. 3 (plug came out looking OK), or dirty no. 6? Might the plug stick have failed on no. 6? ............

Just out of curiosity Terry, when P0300 (random misfire) and P0306 (fault on cylinder 6) showed up, why did you remove 1,3,5 bank plugs instead of the 2,4,6 bank?

I was using a new, £10 code reader, and I did not take it seriously. When I removed plug no. 6 I realised my error. As said before, I learned a lot that weekend. Next time I shall believe the code reader, and have spare new plugs to hand.

[YZ250]

.......
 Yesterday morning I read codes, got PO300, PO306. I removed plugs 1-3-5,
..........
I wonder what failed first. Was it oil in no. 3 (plug came out looking OK), or dirty no. 6? Might the plug stick have failed on no. 6? ............

Just out of curiosity Terry, when P0300 (random misfire) and P0306 (fault on cylinder 6) showed up, why did you remove 1,3,5 bank plugs instead of the 2,4,6 bank?

I was using a new, £10 code reader, and I did not take it seriously. When I removed plug no. 6 I realised my error. As said before, I learned a lot that weekend. Next time I shall believe the code reader, and have spare new plugs to hand.

 

Glad you sorted it.    I find the hardest part of the 2,4,6 bank is unclipping that bloody cable tray. 

[terry paget]

.......
 Yesterday morning I read codes, got PO300, PO306. I removed plugs 1-3-5,
..........
I wonder what failed first. Was it oil in no. 3 (plug came out looking OK), or dirty no. 6? Might the plug stick have failed on no. 6? ............

Just out of curiosity Terry, when P0300 (random misfire) and P0306 (fault on cylinder 6) showed up, why did you remove 1,3,5 bank plugs instead of the 2,4,6 bank?

I was using a new, £10 code reader, and I did not take it seriously. When I removed plug no. 6 I realised my error. As said before, I learned a lot that weekend. Next time I shall believe the code reader, and have spare new plugs to hand.

 

Glad you sorted it.    I find the hardest part of the 2,4,6 bank is unclipping that bloody cable tray. 

Thank you. In my own defence, whenever I have broken down in the past it has usually been crank or cam sensor failure, and the code reader was little help. Furthermore, I have never before had a young plug fail without oil or water in the plug hole or a plug lead failing. 2.6 has no plug leads, but has plug sticks, hence my post heading. Also my panic as this car had to be repaired by the 27th, with little hope of Vx dealer access. Happily I had forum access, and the lads came up trumps.