Help in PCV system diagnosis

[woolveren]

Hi All,

My car's(98 AEB FWD) idle automatically increases at times, so was looking for vacuum leaks and found a crack on the valve housing(item 5 in the parts diagram) in the PCV line below the intake manifold.

I was about to get a new T- valve housing, then got confused by the parts diagram. Where is the bleeder valve(035103245A-item 6 in the parts diagram) located exactly? Is it inside that T-shaped valve housing? Because, when I looked at my car I didn't see a bleeder valve in front of the T- shaped thing as shown in the parts diagram. All I see is a hose coming out of it which is then going to the top of the intake manifold. Now am confused where is this crack exactly...

Am I interpreting things in the wrong way here? Any help would be appreciated..

[walky_talky20]

1 - That isn't a crack in the 3-way housing. That's just a seam from production. See here on a brand new one:



2 - Yes, the bleeder valve is inside the valve housing. The valve housing does indeed....house the valve. I know it's a stretch, but just, just trust.

3 - Behold, with the small hose removed:

[woolveren]

1 - That isn't a crack in the 3-way housing. That's just a seam from production. See here on a brand new one:

2 - Yes, the bleeder valve is inside the valve housing. The valve housing does indeed....house the valve. I know it's a stretch, but just believe me.
3 - Behold, with the small hose removed:

That was really helpful, great picture explanation. I was thinking it was a crack on the T-housing and was happy that I found the cause for high idle.. Lol.

So it seems the PCV lines are all good then, what else can cause an intermittent high idle(goes from 900 to 1200 RPM, stays there for some 10 seconds or so and then comes back to 900 RPM). It only happens every 4 minutes or so.. No active or inactive CEL. Doing this for the last 5-6 months..

[MetalMan]

Could be the PCV bleeder valve itself. I had an issue with the 034 Motorsport billet aluminum PCV valve where my idle would go high sometimes, then come back down, and so on. After spending lots of money on parts trying to fix this I decided to throw in a new OEM PCV bleeder valve... problem solved.

[walky_talky20]

Crap. My idle has been wonky as of late, actually. Mostly on cold-start. Also running the 034 billet PCV valve. I have the "updated" 034 valve, just haven't gotten around to putting it in. Hoping that solves it.

[woolveren]

Could be the PCV bleeder valve itself. After spending lots of money on parts trying to fix this I decided to throw in a new OEM PCV bleeder valve... problem solved.

Did you remove the intake manifold while replacing the bleeder valve? How hard is to change that valve with the manifold still in place?

I don't have any spring clamps on the PCV lines there, all are worm type clamps so less complexity..I guess..

[MetalMan]

It's obviously much easier to service those parts with the IM (intake manifold) removed. But I've done it both ways. If you unplug the coolant level sensor and swing the coolant tank out of the way you gain more access. If you remove the throttle body and the hose that attaches it to the intercooler, you can even more access.

It's not too bad to change. Having adequate light in that area helps immensely as well.

[woolveren]

If you unplug the coolant level sensor and swing the coolant tank out of the way you gain more access. If you remove the throttle body and the hose that attaches it to the intercooler, you can even more access.

Oh yeah, I can remove the throttle body fairly quick. just had it removed some months ago for cleaning:) I guess i will do it without taking IM out and by moving the coolant tank away..

[pbcrazy]

Other people have weird idle with the 034 pcv check valve??? I thought something was screw up. Mine will idle at like 1150 cold then after about 30 seconds it drops and feels like it's drowning. Hasn't caused me any problems, nice to know it's not just me though

[AudiB5owner]

I'd look into the silicone PCV parts from 034 Motorsports. Any cracks in the PCV lines there will mess up your idle and fuel trims. My S hose was torn and leaking vaccum and boost, causing a -6 Long term fuel trim and slightly shaky idle. Totally accessible with the IM attached. Slip your hand in the gap between the SJP and the firewall near the brake booster line and you can access the PCV valve. To unclip the whole thing out of the oil cooler, unbolt the coolant expansion tank and move it to the side so you can fumble your arm under the IM. Do this all with a cold engine.

[woolveren]

Slip your hand in the gap between the SJP and the firewall near the brake booster line and you can access the PCV valve..

PCV valve is on turbo air intake hose, right?

[pbcrazy]

PCV valve is on turbo air intake hose, right?

Yes but I believe he means the pcv system. If you remove the coolant tank it's actually quite easy to get to all of it

[kraylon]

PCV valve is on turbo air intake hose, right?

Isnt that the "pancake valve" also known as the PRV?

[AudiB5owner]

Yep the pancake or ufo valve is all of those things. The PCV valve is under the Intake Manifold, where that torn T housing is. I just bought a new pancake valve from ECS on sale for $12 by Vaico, the cheapo eBay one cracked after 1 week of use. If you unscrew the coolant expansion tank and move it over to the side, you can wiggle your arm under the IM and access all of that stuff. Take it from my experience, don't try and take out the hard metal PCV pipe that travels up to the 3 way breather hose coming out of the crankcase itself.

[AudiTurbo]

1 - That isn't a crack in the 3-way housing. That's just a seam from production. See here on a brand new one:



2 - Yes, the bleeder valve is inside the valve housing. The valve housing does indeed....house the valve. I know it's a stretch, but just, just trust.

3 - Behold, with the small hose removed:

I have the S shaped pcv pipe of the one shown above. Is the setup the same when it comes to the bleeder valve?
Also, what is the easiest way of changing this?

[woolveren]

I have the S shaped pcv pipe of the one shown above. Is the setup the same when it comes to the bleeder valve?
Also, what is the easiest way of changing this?

OEM breather hoses are S-shaped, the bleeder valve setup is same. I have replaced the whole system using OEM parts, you can see it in the second picture below.

And about the easiest way in replacing these> When I asked around, I was told the PCV can be replaced with intake manifold in place. But I felt it very difficult with intake manifold in place, maybe because I was replacing the breather housing as well and all four bolts were a bitch to come off from the cylinder block. I ended up removing the IM as shown in the first pic below, then everything was super easy. :)

You can try with IM still in place, I know some people here have done that way..

[AudiTurbo]

OEM breather hoses are S-shaped, the bleeder valve setup is same. I have replaced the whole system using OEM parts, you can see it in the second picture below.

And about the easiest way in replacing these> When I asked around, I was told the PCV can be replaced with intake manifold in place. But I felt it very difficult with intake manifold in place, maybe because I was replacing the breather housing as well and all four bolts were a bitch to come off from the cylinder block. I ended up removing the IM as shown in the first pic below, then everything was super easy. :)

You can try with IM still in place, I know some people here have done that way..

Okay, thank you for the pictures. I just didn't know if I was able to sure the straight pcv pipe or not. I have changed this before, but I didn't remove the intake manifold. That just looks like a lot more work.
Guess I could look up a DIY somewhere

[AudiTurbo]

OEM breather hoses are S-shaped, the bleeder valve setup is same. I have replaced the whole system using OEM parts, you can see it in the second picture below.

And about the easiest way in replacing these> When I asked around, I was told the PCV can be replaced with intake manifold in place. But I felt it very difficult with intake manifold in place, maybe because I was replacing the breather housing as well and all four bolts were a bitch to come off from the cylinder block. I ended up removing the IM as shown in the first pic below, then everything was super easy. :)

You can try with IM still in place, I know some people here have done that way..

Okay, thank you for the pictures. I just didn't know if I was able to sure the straight pcv pipe or not. I have changed this before, but I didn't remove the intake manifold. That just looks like a lot more work.
Guess I could look up a DIY somewhere.
Instead of using the metal pipe again and not spending 130 for the 034 one, can I just not run my own silicon hose over to the pvc valve itself from the T fitting?

[woolveren]

Okay, thank you for the pictures. I just didn't know if I was able to sure the straight pcv pipe or not. I have changed this before, but I didn't remove the intake manifold. That just looks like a lot more work.
Guess I could look up a DIY somewhere.
Instead of using the metal pipe again and not spending 130 for the 034 one, can I just not run my own silicon hose over to the pvc valve itself from the T fitting?

Actually, the pictures from my car is for an AEB engine. It looks like the PCV valve picture below the ECS tuning pic in post #15 is for an AWM engine, so the breather hoses are different where AEB/ATW is S-shaped..

To remove the IM, i just followed this DIY which is very well documented.

http://www.passatworld.com/forums/61...ld-gasket.html

And about running silicon hose, I may not have a good answer hope someone else chimes in..

[GrapeBandit]

im surprised I misses this thread. just delete the PCV system, no need to put money into it.

[AudiTurbo]

im surprised I misses this thread. just delete the PCV system, no need to put money into it.

I want to do that, but I can't get a straight answer on it. I know you are suppose to run a 1 inch bung into the place the s shaped thing goes, and that goes to a port on the catch can, but I don't know where the other port goes too and also where anything from the t goes

[GrapeBandit]

I want to do that, but I can't get a straight answer on it. I know you are suppose to run a 1 inch bung into the place the s shaped thing goes, and that goes to a port on the catch can, but I don't know where the other port goes too and also where anything from the t goes

I dump mine straight to the ground, so do alot of other members. to do that, you need IE or 034 block breather adapter, run hose from that straight to the ground. plug the hole in the tip. its been a while, but thats basically it. I deleted my pcv and evap system and have no CEL's

[AudiTurbo]

I dump mine straight to the ground, so do alot of other members. to do that, you need IE or 034 block breather adapter, run hose from that straight to the ground. plug the hole in the tip. its been a while, but thats basically it. I deleted my pcv and evap system and have no CEL's

So, with the crack in it right now, it's not really causing any harm at all? Also where it t's off with the bleeder valve and goes to the intake manifold, What do you do with that?

[GrapeBandit]

So, with the crack in it right now, it's not really causing any harm at all? Also where it t's off with the bleeder valve and goes to the intake manifold, What do you do with that?

as long as its not clogged, it doesn't cause harm. the valve with the T you are talking about gets removed, and you cap off the nipple on the manifold.

[GrapeBandit]

http://www.audizine.com/forum/showth...-Removal-guide
http://www.audizine.com/forum/showth...n-Question-AEB
http://www.audizine.com/forum/showth...e-removal-HELP
http://www.audizine.com/forum/showth...f-a-PCV-delete
http://www.audizine.com/forum/showth...Simplification

read these. all the info is in there