Hi there . . . I'm new to the forum, and returning to Audi after a 15 year absence. (It's like coming home!)

Here's my question: What differences exist between the ATC engine and the AWP, and how might they affect me in a swap?

I have a 2000 TT which the PO screwed up & the original ATC engine was replaced with an AWP. The shop that worked on it--VAG virgins, every one of them--gave up and I ended up with the car at what I think (thought??) is a good price. Although it ran when I got it, the dash looked like a Christmas tree with all the lights lit up. After clamping down at least 9 separate hoses that were either not connected or not clamped, I've got it running OK at 2000+, but turning codes below that. This sounds like a vacuum, or maybe boost leak, but acts suspiciously like a MAF failure, too. I've ordered a Bentley CD, and have the VAG-COM codes, but then came across the fact that the wrong motor is in the engine bay!!

So, at this point, I am trying to find out a couple of different things:

1) I know that the shop called in the VIN to Audi to get the list of what they needed and were told 'AWP' . . . since the build tag says 'ATC', and it's a 2000 model, why would they (Audi) have told the shop the wrong one??

2) Since the AWP is a variable cam timing motor, and my car will not have the wiring nor the ECU expectation of the cam signal, what problems might crop up if I keep the AWP motor in it?

3) Other than the cam timing issue, what other differences are there in the motors, and what effect would they have on using it?

Since it's 95% runnning now, it seems like the problems are surmountable, but I want it to run right, too. If I have to replace the motor again, I'll do it, but I'd rather not if it will work the way it is. Here are the VAG-COM codes:

16622 P0238 Manifold Pressure / Boost Sensor Signal Too High
16490 P0106 Manifold / Barometric Pressure Sensor Implausible Signal
16684/5/6 P0300/P0301/P0302 Random/Multiple Misfire/Cyl 1 Misfire/Cyl 2 Misfire
17536 P1128 Bank 1 System Too Lean

The car runs very rough (2, 3, 4 cylinders off and on) anytime it's under 2000 rpm, but quite strong above that. If you push it hard, you'll get a distinct gasoline smell inside the cockpit. Also, at low rpm the idle fluctuates between 800-2000 (like the MAF problem).

Any help you can provide is appreciated.

 

The guys at the audiworld forums might be better suited to answer that, but a quick question, would putting a new AWP computer in teh car solve the problems?

 

It might, but it would also mean changing the wiring harness & there are both vacuum and sensor differences too (I'm told).

 

Anyway, if you haven't yet....

http://www.audiworld.com/forum/tt.html

This is way over my head, but probably right up the alley of these guys. They know the car inside and out.

Good Luck.