03 AMB 1.8t leak issue, local help or vagcom?

[NWB6]

Hello all, I am having a vacuum leak issue with my 2003 a4 1.8t quattro amb engine. When I first took possession of the car, it idle really rough, lacked power and had both the CEL light and esp light on. At that time i only had ONE code when i ran it with an obd2 reader. The code was a p0102 for mass air volume input low. Since it had the ESP light on too, I figured it was the MAF. I replaced the brake light switch, my broken suction jet pump too before doing the MAF just incase. Didnt fix my problem so I went ahead and replaced the MAF.

After replacing the MAF, the ESP light went away and I am finally able to turn traction control on and off

Except the CEL light came back! This time, the P0102 light did not return, indicating my MAF problem was solved, however i had some new codes this time,

-Some misfire codes P0300,P0301,P0302
-And P0171 for system too lean bank 1

These codes were new after i replaced the suction jet pump, leading me too believe i messed something up while wrestling that sucker out.(and not merely a coincidence or something indicating o2 sensor or ignition coils) I checked the area only where I was working since the codes only appeared after that, and I found nothing leaking or loose.

After some research I found multiple people who Indicated their PCV valve was the culprit, and too do the Oil Cap test, Sure enough it was hard to remove and there was suction from the cap hole/crankcase. Figured i must have been to harsh on it and broke it or something? My next step is to replace the PCV.

My issue however, is that for every search I do people claim the PCV valve to look 3 different ways.

The one Im suspecting looks like this:



But all replacement parts claim it too look like this? With No clarification if the part was superseded and redesigned or what. Also people claiming its under the intake manifold but mine is right behind it towards the firewall and easily accessible:


TBH not really sure how vagcom works if it will help specifically narrow down so youre not just guessing, but figured I could ask for help



Lengthy post, but would appreciate your input, opinions or clarifications. Just when I thought the MAF would fix my idle and rid me of the ugly CEL light something else pops up

[NWB6]

whoa hey not everybody at once

[IslandHydro]

Did you post it to the B6 A4 forum? You'll likely get better results there.

[PwrWgn]

ECS says for the one on the bottom picture "Up to VIN 8E-3-040000, split is in the 2003 model year". Since you have a 2003, you might want to take a look at your VIN to be sure.

There is also one that looks like this that applies to 8E-3-040001 onwards:

The check valve in the first picture looks a lot more like the style that is used in the EVAP system and not PCV. It is still a check valve and it can probably still fail, but it sounds like your problem is with the PCV.

[NWB6]

Did you post it to the B6 A4 forum? You'll likely get better results there.

Yea, I posted it to a couple different sections, I got replies. It seems to be the pcv system under the intake mani which I was recommended this kit. https://www.ecstuning.com/Audi-B6_A4...8164/Checkout/

Will make sure vin matches up then order. and update after install

[VinnysS4]

im down in oregon with a vagcom if you ever need

[DoItAllGarage]

Bypass the PCV and install a catchcan. Not sure what kind of budget you have. When things run lean, that means (less fuel is feeding). Misfire could also be spark or fuel problem. I'm in your area. PM me and we can talk.

[incubusfc]

I'm in the Lake Stevens area and if it's a vacuum leak I have a pretty neat tester that I could use to see where it's leaking.

There's the evap system, which has 3-4 check valves (like the one first pictured) This system can be replaced with a catch can and some caps, amazon has cheap catch cans for like $15.

As far as the PCV valve, I can't say I've ever replaced mine.