Hi,
Some time ago I replaced the ECU in my TT, because someone put an ECU with AUQ in my APP 180KM, which is paired with a wideband sensor, I replaced it with an ECU with AJQ and now the sensor works and many other errors disappeared. After this change I noticed very low readings on the flow meter reaching a maximum of 90 g/s at 6000 rpm. I have made several logs on channels 001, 002, 003, 031, 032, 033, 115 and after analyzing them I can say that:
I think I've listed everything I could check, maybe someone else has an idea what could be wrong with this car?
Thanks in advance to everyone
Some time ago I replaced the ECU in my TT, because someone put an ECU with AUQ in my APP 180KM, which is paired with a wideband sensor, I replaced it with an ECU with AJQ and now the sensor works and many other errors disappeared. After this change I noticed very low readings on the flow meter reaching a maximum of 90 g/s at 6000 rpm. I have made several logs on channels 001, 002, 003, 031, 032, 033, 115 and after analyzing them I can say that:
- absolute boost pressure reaches peak values around 1700mbar, the set pressure matches the obtained pressure with small deviations, so the turbine delivers rather well
- I checked the system under pressure immediately after the flow meter and apart from a small air leak from under the dipstick there are no other outlets, the pressure of 1 bar remained in the system so there is probably no left air here
- I checked the throttle valve, it works as it should
- I have LPG in the car, there are no differences between these fuels in driving or in the flow meter readings, so it is probably not a fuel problem, this is additionally confirmed by corrections from channel 033, which are equal to 0 at load, we are of course talking about logs made on PB
- no misfires
- no sensor gives error, only cluster is faulty
- in VCDS all tests pass with positive result
- AJQ engine has only one o2 sensor before the catalytic converter, during load the mixture is a bit too lean, readings around 0.75V
- ECU coding is correct, but I don't know about the map, I was assured that it was stock
- I did a test drive without the airbox, with only the flow meter and its reading increased only a little
- I swapped the flow meter from my second TT with AJQ engine, the readings were practically the same (that's why I doubt that it's the flow meter itself), and the second TT accelerates much better
- I cleaned the flow meter, but it didn't work
- I also tried driving with the flow meter disconnected, no difference
- at idle the revs maintain very nicely around 850 rpm, the flow meter indicates a normal 2.5 - 4.5 g/s, the problem only starts under load
- with logs, the engine load parameter rarely reaches 100%, not to mention higher values
- the car itself accelerates quite smoothly, but quite weakly compared to the second one, practically the same
- I recently replaced the gasket under the valve cover, so I checked the spark plugs, they were ok, the timing chain is also ok, as I mentioned earlier, there are no misfires, there is no knocking combustion
- when I still had the ECU with AUQ installed, I made logs there and the indications on the flow meter could reach a maximum of 120 g/s, but it is still too little, and the car drives the same on this and on this ECU, if there is anyone who could check it, I can download the map because I have the right cable
- I also replaced the DV, so it is definitely functional
- I also replaced the elbow from the pneumatic valve, the entire pneumatic valve is probably ok
- I checked on three different N75, whose resistance was in the range of 25-35 Ohm, no difference
- I also checked the EVAP system, but I did not see any problems there
- I use the Torque Pro application for a quick preview of parameters and there is a slightly strange situation, because it indicates a very low boost (0.08bar) and a very large vacuum (0.8bar), but I don't know if this is a good reading
I think I've listed everything I could check, maybe someone else has an idea what could be wrong with this car?
Thanks in advance to everyone
