Steviecef

<center><img src="http://pictureposter.audiworld.com/68526/vaclayout.jpg"></center><p>I have a 2000 1.8T with a GIAC chip. Its been running great till the other day. I got on it at highway speed, (80mph) and when the car downshifted and went for boost, it stumbled.

I thought for sure that I had an obvious boost leak so I made the DIY leak checker from the forum and tested. SSHHHHHHHHHH.

I found a broken check valve blowing loud and strong. Thinking I was victorious in my troubleshooting, replaced it, test drove and to my dismay, it died out again.

Just did the leak test again tonight, no leaks. I put a vacuum tester on the BPV and it seems fine too.

I did get multiple misfire and incorrect boost requested DTCs before replacing the check valve. The only VAG fault I get now is a secondary air injector, incorrect flow.

However. When checking with the VAG on the "readiness" button I get an O2 and CAT "failed or incomplete" Does that mean I have a failed CAT or O2 sensor or does it mean that since I don't have the full version that I can't read it?

I have changed the plugs as well. The car misfires and bucks with both sets of plugs.

What else could it be? MAF? Coil Pack? ICM? Who has been trough this same situation? Thanks much.

German Driver

your on the b6 forum. click above for the b5... hope they have the answer :-/

fongaroos

i might have 17in sport wheels for sale..are you in socal?

Steviecef

I had changed all the plugs and put all coil packs back in same postions.

Steviecef

please send info on wheels, thanks

Steviecef

thats why i put it as off topic

Steviecef

the problem came before the plug change, i was hoping that a regular interval plug change might clear it up as well

fongaroos

wheels are sold...