albertz
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| posted on 3/5/09 at 07:50 PM |
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Zetec engine breather
Can someone tell me where the Zetec engine breather connection is? I cannot see the breather on mine and i am finding a high pressure after i pull the
dipstick, therefore i am thinking maybe the breather is blocked somehow, but i cant find it!
Incidentally, is there possible way that a high pressure in the sump (i.e. blocked engine breather) can lead to a rich running engine? Are there any
sensors that might be reading a duff signal as a result of this?
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big_wasa
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| posted on 3/5/09 at 07:58 PM |
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There are two breathers. One on the rocker cover and one on the block under the exhaust.
Ive blocked the one in the block of. The one on the rocker should be fine on its own.
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ss1turbo
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| posted on 3/5/09 at 07:58 PM |
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It should be under the exhaust manifold - unless its been blocked with a core plug...
Long live RWD...
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big_wasa
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| posted on 3/5/09 at 08:07 PM |
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pic of one below exhaust
 
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albertz
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| posted on 3/5/09 at 08:09 PM |
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The rocker cover one is piped around and into a large pressed steel container under the exhaust mainfold, i assume that it connects to the block there
as well then?
Apparently i am supposed to connect the engine breather back into the inlet manifold, but not the rocker cover breather. Martin from Griffin Power
Systems thinks that might be why my car is running so rich and misfiring slightly. I suppose all i can do is try but i am not too sure that is the
cause of the poor running, hence my question about the engine breather being in any way connected to the rich running of the engine.
It is a brand new engine, would you expect it to be blocked off somehow on a new engine?
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big_wasa
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| posted on 3/5/09 at 08:22 PM |
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That sounds like your problem.
You have the breathers connected together.
For the top one, put a cheap filter on to it or get a catch tank.
The bottom one wont work with out the EGR gear to work it. Yoa may aswell block it of.
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albertz
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| posted on 3/5/09 at 08:31 PM |
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When you say that may be your problem, do you mean the pressurisation of the engine or the rich running? or both?
Also, excuse my ignorance, but can you tell me what the EGR gear is and what it does?
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ss1turbo
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| posted on 3/5/09 at 08:32 PM |
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The block one is normally connected to a stub on the inlet manifold (there's a bit of a maze of passages to spread it around the 4 ports) via a
pipe which goes under the coil pack - well it does on a silvertop zetec! Not sure about the later ones, but guess it'll be similar.
Rocker cover one will go to the induction pipework prior to the throttle body - i.e. a catch tank/filter then!
Long live RWD...
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big_wasa
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| posted on 3/5/09 at 08:39 PM |
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If you have the top one conneted to the bottom one then you have know way of letting the presure out and you are going to blow an oil seal or
somthing.
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big_wasa
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| posted on 3/5/09 at 08:43 PM |
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Egr, have a read Link
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big_wasa
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| posted on 3/5/09 at 09:04 PM |
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Another good read Link
When fitted in the mondeo ect, the pipe from the PPV (crank braether valve in pressed steel conatainer) goes to the EGR valve. This is operated by the
solenoide)
In short it wont work with out all of the gear to work it.
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albertz
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| posted on 3/5/09 at 09:13 PM |
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Thank you both for your advice. I will do as you say and connect the engine breather to the inlet manifold and the rocker cover to a catch bottle or
filter. I honestly did not realise these things had such an effect on the fueling, but there you go!
Just to confirm, do i leave the big pressed steel container thing as it is, or remove it completely?
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big_wasa
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| posted on 3/5/09 at 09:46 PM |
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Your call mate.
For me I would dump it. I cant see how dumping hydro carbons into the inlet is going to make it leaner.
Your running the omex ecu yes ?
Aslong as there are no air leaks on the manifold and the mapping is correct I would look at injectors and fuel presure as the reason to running rich.
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austin man
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| posted on 4/5/09 at 11:14 AM |
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my breather pipe on the 1.8 silvertop comes from the manifold side and exits under the coil pack. I wouldnt recomment blocking a breather off as this
will increase the pressure in the engine. Both my breathers go into a home made catch tank.
My brother in laws initiall had the crank breather attachet to the griffin inlet plenum, we found that the engine was drawing so much air it actually
started to suck oil from the block so we had to dissconnect it form the plenum. It appears that the inlet may be a litte restrictive. He now runns
throttle bodies and has the pipe connected to the inlet and has no problems.
Life is like a bowl of fruit, funny how all the weird looking ones are left alone
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