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[alexandjen]

Took mine off today to find it was blocked solid with crudd   what problems could this blocked pipe cause?
I am also going to replace the rocker cover gasket tomorrow and wondered , do I need sealent on any part of the head?

[Matchless]

I assume you mean the vertical metal pipe?

If this is blocked then it is very likely that the large and small breather pipes from camcover to throttle body will also be blocked, and possibly the spigots that these pipes push onto. Remove these pipes and clean well, if the small breather spigots are blocked use a small twist drill held in your fingers to clear the carbon, the hole at the throttle body is 1.6mm I think, larger at the camcover.

To replace the camcover gasket you will need some black sealant from Vauxhall, get the gasket from them, also the O rings for the bolt holes, DO NOT USE A PATTERN PART.
You will need a replacement metal gasket for the breather tube and you might as well get a new throttle body gasket, its easier to clean if you remove it.

[JamesV6CDX]

I assume you mean the vertical metal pipe?

If this is blocked then it is very likely that the large and small breather pipes from camcover to throttle body will also be blocked, and possibly the spigots that these pipes push onto. Remove these pipes and clean well, if the small breather spigots are blocked use a small twist drill held in your fingers to clear the carbon, the hole at the throttle body is 1.6mm I think, larger at the camcover.

To replace the camcover gasket you will need some black sealant from Vauxhall, get the gasket from them, also the O rings for the bolt holes, DO NOT USE A PATTERN PART.
You will need a replacement metal gasket for the breather tube and you might as well get a new throttle body gasket, its easier to clean if you remove it.

Agreed with Matchless, although I occasionally use a smear of the sealant on the block tube with the new gaket, if no new gasket available

[alexandjen]

[quote from Matchless] I assume you mean the vertical metal pipe?

Yes tht's the one, it was blocked solid and I had to push a large screwdriver through it to start breaking it up, it is now spotless.
This morning the throttle body is coming off for a good old clean.
I have already bought the gasket/o rings from Vauxhall.
Would these blocked pipes cause misfiring?

[Matchless]

Blocked breathers can cause problems with idle speed and stalling but not misfire (directly), thats most likely to be due to oil on the spark plug insulators and connectors from a leaking camcover gasket.
The camcovers leak when breathers are blocked and crankcase pressure is too high so a blocked breather could lead to a misfire.