rocker cover breather hose?

[acko]

If this is what its called....

i have a mk2 1.6 driver and did the head gasket a month or so ago. While i was putting it back together I noticed that the hose that runs from the top of the rocker cover to the air box on top of the carb was cracked and split. I didn't think it did much so just put it back on rather than getting a new one because I didn't have time to sort one out. I will replace it with a new one when i get round to it but i was wondering what the function of it is and what the effects of having a knackered one would be. I ask this because my car is crap at idle untill warm, even now when the weather is beaut i can start it from cold and it will rev automatically for 5 secs and then splutter and cut out unless i give it a bit of revs (I still have the crappy pierburg!) Could a split brather hose have anything to do with this??

Cheers dudes

[animaniac]

its called a pcv.. positive crankcase ventilation system!!

basicly it sends evaporated oil and water, pterol. and other piston by products stuff from the engine and vents them to the inlet pipes / manifold / airbox so that the engine can suck then in a burn them...

Definition: A means of controlling crankcase blowby emissions and removing moisture condensation from the crankcase to prolong oil life. See PCV valve.



some may also have a valve on them... but this depends on make and model of car!!
i dont think vw's have vales on them but heres the info!!


Definition: The Positive Crankcase Ventilation valve is an emissions control device that routes unburned crankcase blowby gases back into the intake manifold where they can be reburned. The PCV system is one of the oldest emission control devices, and also one of the most beneficial. Besides totally eliminating crankcase emissions as a source of air pollution, the constant recirculation of air through the crankcase helps remove moisture which otherwise would cause sludge to form. Thus the PCV valve extends the life of the oil and engine. The PCV valve requires little maintenance. The valve and filter should be replaced somewhere around 30,000 to 50,000 miles (see the vehicle owners manual for service intervals).

[Veedubgt18v]

because its actulally illegal to vent that stuff to the atmosphere.....

the pierburg is a fickle beast and any vacuum leak could cause big probs. i would replace your vacuum lines and check the condition of you choke and waxstat. the haynes manual or bentley manuals should tell you how, long time since i had a carbed mk2

[rubjonny]

Did you replace the inlet manifold coolant o'ring when you did the head?  If not its probably blocked and preventing coolant from reaching the autochoke & wax stat.  Also if it keeps stalling it sounds like you have a vacuum leak, check all the hoses you can see, especially the ones round the back

Theres an FAQ for the 2e2 carb stickied in this forum, have a read through

[Veedubgt18v]

which reminds me the metal coolant rail that runs down the right hand side of the engine as you look at it can get furred up over time i would replace that to cos it is all part of the waxstat/choke system

[acko]

Cheers guys,

I replaced the o ring when I did the head gasket.

That metal coolant pipe that i think your talking about is pretty rusty and knackered looking so may be somet to change. It doesn't keep stalling once its warm, only when its just first started? so that sounds like its not the vacuum pipes? could it be that spikey thing in the inlet manifold, 'pre heater' or something? Also I think something was earthed onto the rocker cover that I didn't fix back on because the wire had corroded from the mounting bracket, anybody know what this could be? What is earthed from the carb to the rocker cover?

I'll just throw it in the bin one day and fork out for a weber at last!...

Acko

[animaniac]

i never knew it was illegal to have it venting the atomosphere!!!
i've seen many people who have a mini k&n filters on top of their rocker cover!! ie making there system open!

i'd rather keep the system closed and keep it clean!! as it fills the engine bay with fumes.. and still belts out oilly dirt! i dont think mine have time get gunked up....... engine acts like pac man....... fuel and air eater!

[Veedubgt18v]

i never knew it was illegal to have it venting the atomosphere!!!
i've seen many people who have a mini k&n filters on top of their rocker cover!! ie making there system open!

i'd rather keep the system closed and keep it clean!! as it fills the engine bay with fumes.. and still belts out oilly dirt! i dont think mine have time get gunked up....... engine acts like pac man....... fuel and air eater!

the little filter 'filters' the air coming out the engine

[animaniac]

i didnt think they filtered oil vapour very good just dust and dirt.... always something new to learn!

bloody amasing how much stuff you can know about on the net!!

i wish they'd get a cure for canker sores!! sure some mad scientist knows how to cure them!

painfull little things!!

[rubjonny]

Also I think something was earthed onto the rocker cover that I didn't fix back on because the wire had corroded from the mounting bracket, anybody know what this could be? What is earthed from the carb to the rocker cover?

I'll just throw it in the bin one day and fork out for a weber at last!...

Acko

Well for a start the atochoke electric preheater wont work, and neither will the the little heater screwed into the front of the carb, both of these are earthed through the lead from the front of the carb to the rocker cover.  Best you connect it back up eh?