Having a issue with my Jetta 06 2.0 TFSI running realy rough on idle.
Getting bellow 3 error codes:
If anyone has had same issue or can help out would be greatly appreciated.
When i tried to remove oil cap it was very difficult it actually dint even let me do it. The handle nearly snapped off!
Here's a good explanation of how the system works
"PCV stands for Positive crankcase venitilation. There is pressure in the crankcase if you open the cap you now have created the path of least resistance and you will get pressure coming out of the 1.5" hole vs the .5" hole that is the PCV.
With a PCV system like ours routed back to the intake the point is that whether the vacuum the turbo creates at part and wot or the vacuum is created by the intake manifold at idle it will see vacuum however not too much vacuum. Having too much vacuum will actually literally suck oil right out of the crankcase which is actually more common then the other way with boost blowing into the crankcase.
If you look at that round flat part of the front PCV portion that is a restrictor, at WOT the path to it is closed by a check valve near the connection for the hose going to the intake manifold this prevents boost from blowing into the crankcase defeating the purpose of the PCV.
The opposite though when the car is at idle or under vacuum in the intake manifold at part throttle the rubber diaphram in the restrictor pulls itself more and more closed. The higher the vacuum the less flow. So if you have the car running and attempt to open the cap but cannot due to the strenght of the vacuum or the car stalls out because having the cap open is drawing in that much unmetered air then you know that restrictor failed, quite common for the rubber to tear.
Now if you have so much pressure that the cap blows off or is blowing oil out then you probably have the failed part of the valve that is supposed to seal shut with boost. Oddly this seal works better with more boost (like a DV) and isn't usually increased boost that kills it. STock your car can make 20+psi but is requesting 12 so if it has a leak of say 2psi it can make 14-15 to make the boost it wants, people just don't notice that it fails until their software that is supposed to make 20psi only makes 15 because the leak is greater then what the car can compensate for."
source: VW GTI Forum / VW Rabbit Forum / VW R32 Forum / VW Golf Forum - Golfmkv.com - View Single Post - Pressure under oil cap?
Thanks appreciate your help!!
Since when does a turbo create vacuum ?
Vacuum at WOT , ha ha ha , turbo's create boost not vacuum !!
And the intake manifold now creates vacuum ?
You'll find most cars wont have such a big issue with vacuum sucking oil out due to the amount of restrictors in the rocker cover and the pcv itself .
And for everyones information the TFSI engine is a negative crankcase ventilation, the same as the early 5 cylinder audi's. To test this pull the dipstick out and start the car, the car should run slightly rough, placing a finger over the dipstick tube you should feel a vacuum and the engine should slowly return to an even idle. Removing the oil cap while the car is running is just going to show you how much negative pressure there is in the crankcase.
Changed the PCV with a BSH bulletproof one and the engine is running all good and the codes have dissapeared.
When there isn't acceleration as the outlet side of the turbo is under vacuum just like the intake side.And the intake manifold now creates vacuum ?
The description that I _quoted_ was adequate for the problem at hand and gave a good overview of how the system works.You'll find most cars wont have such a big issue with vacuum sucking oil out due to the amount of restrictors in the rocker cover and the pcv itself .
Which is what the description I _quoted_ said.And for everyones information the TFSI engine is a negative crankcase ventilation, the same as the early 5 cylinder audi's. To test this pull the dipstick out and start the car, the car should run slightly rough, placing a finger over the dipstick tube you should feel a vacuum and the engine should slowly return to an even idle. Removing the oil cap while the car is running is just going to show you how much negative pressure there is in the crankcase.
Maverick to the rescue again!
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