Hi Rob
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Originally Posted by Rob
Thanks Scott, that clears it up.
I'm using the original MAF sensor (and the original ECU).
One more question if you don't mind. Arrow #2 is the crankcase ventilation, but what is #1 ?
Also, would I need a PCV valve on the crankcase vent ?
(I guess that's 2 more questions  )
Thanks ! Awesome car by the way.
Rob. |
I'm not sure what that hose #1 is, with out seeing more and knowing just what model engine you have it's hard to tell, also they may have different emissions systems between NZ and the US or Canada. Maybe you could take a few more pictures wider angle and e-mail them to me at
vw1302rsi@yahoo.com.au and I’ll see what I can do.
As far as a PCV valve goes- do what you want or what the law will allow you to do. If you are venting the crankcase or rocker cover vents into the manifold after the throttle body the PCV valve is important.
If you are venting it into the hose between the throttle body and the airflow meter it shouldn’t be an issue unless you are by passing the air flow meter with lots of air.
PCV stands for positive crankcase venation so if you went in to the air cleaner or the inlet pipe its not positive as there is no vacuum sucking the fumes out. If it is vented into the manifold with a PCV valve then you need an inlet into the crankcase and this needs to be filtered. The factory did this on the Subaru engine I have by connecting the rocker cover vents to the air filter housing between the filter and the throttle body, if it had a air flow meter it would be between the meter and the throttle body, so any air travelling through the crankcase was measured. On my car that pipe number 2 in your picture went to the PCV valve in the manifold and to the inlet ducting before the throttle body, from memory I think?
But remember that turbo cars have pressure in the manifold at times so they are slightly different in the plumbing.
Also oil vapour lowers the octane rating of fuel so you may not want to vent it into the inlet system.
At the moment the ventilation system on my car is an open type, but when I add a breather hose to the air cleaner all the fumes will go in to the inlet system and be a closed type but it won’t be a positive type, make sense.
Thanks for the comment about the car.
SW