Hello everyone, just got done doing a engine swap on a 06 Audi A4 Quattro 2.0t 6sp manual. Used the ecu that was in the car, the ecu has a APR stage 1 tune. Engine I put in there is a bwt with 50,000 miles. Engine removed was a bpg. I've put about 100 miles on the car. I have a wifi OBD2 plug in with OBD fusion app for my iPhone for basic code and dash readings
Problems
1. Car never gets above 160 degrees system is filled and no air bubbles. Got good heat.
I've got code P2181 cooling system performance. I'm pretty sure my thermostat is stuck partial open. Just bought one today. Not my big concern.
2. Got code P0299 turbo/super charger underboost. I'm pretty sure I have a slight leak somewhere. If I punch it in the lower gears I get spikes of 23 psi and drops to around 16 but then it will just drop to nothing. Sometimes if I'm around 2500rpm and applying gas it will hold around 6 psi then just bam down to 0 and then will start building again. I made a diy boost leak tester. Can't check for leaks until I'm off on Monday. Also bwt engine had stock diverter valve with the early revision.
3. This is the one that I'm worried about. Got the famous P2293 fuel pressure regulator code. First thing I did was check the follower and it was silver on top but no damage and the camshaft looked good, replaced follower with a new one.
I'm assuming this code is my performance problem. I can run the car high into the rpm in the lower gears well I was shifting around 5500 and get good acceleration. But if I'm going 60 in 6th gear and I need to pass and drop it into 4th it will jump up to around 4000 rpm but won't increase rpm or speed at all just sits there screaming and don't gain no speed. ! Even with the pedal to the floor. I have more acceleration staying in 6th.
According to the OBD reader my fuel rail pressure stays right around 1250 psi, don't take a nose dive or anything. I replaced the one fuel pressure sensor on the side of the hpp with the one from the other engine it made no difference. Didn't try the top one yet.
My girlfriend has a 07 Audi A4 2.0 Quattro except automatic with the bwt engine. Her car runs and drives fine. So I have a car that I can rob parts to try and figure this out. Thinking maybe the apr tune being programmed to a bpg engine is causing issues. I don't have the option to go back to stock tune. If you have any ideas let me know. Thanks everyone one for your input and time
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