Like my sig says, 98 1.8t manual fwd.

There is an aftermarket chip in the ecu, but I'm only getting 4 or 5 psi of boost (I've replaced DV, doing leak test soon). But the problem now is that I cant get the ross-tech vag-com software to work with my car. It connects, the port test says "Port ok, interface found" but I cant connect to any of the modules on the car. I ran the OBD II compliance test and it says the car is not OBD II compatible!

I've identified that the cable/computer is not the issue as I have tried two different ones on my car, and both of them work on my friends A6. I went through the procedures correctly, followed the writeup on Audizine to the T.

I also believe the port in the car itself to be ok because when I had the stock radio in there my friend and I could use the ross-tech software to run diagnostics on the radio, but nothing else.

Ideas? Thoughts?

 

that is past-tense, meaning you dont have the stock radio in there right now? that is your problem right there. search for "aftermarket radio OBD port" and you will figure out why.

the 5psi of boost means your in limp mode. is your CEL on or flashing?

 

Yeah, I have an aftermarket radio in there, and before I installed it I did a little research and found out about aftermarket harnesses creating a loop (aka short circuit) for the OBD port. I made sure it was disconnected when I installed it so it wouldnt blow scan tools. Nevertheless, I tried it before I took the stock radio out, and back then it still said "Not OBD II Compatible".

As for limp mode, that's why I'm trying to get into the computer. Though, I have doubts about whether or not the problem is actually limp mode, I have no CEL, and I've unplugged the battery (resetting the ECU) multiple times and it has made no difference. I think it might be a bad leak.

 

what is your vacuum reading at idle and while coasting at like 3k rpms? it should be around -22psi and -27psi respectively. any closer to zero and you probably have a leak.

 

Yeah, sounds like it. Coasting while in gear it shows right around 20 in. HG. But the calibration's off because with the car off the gauge shows 4 in. HG. So the actual reading is probably in the neighborhood of 16-18 in. HG. I'll try to do a leak test later today.

I still cant figure out why the ecu wont communicate withe vagcom.