Hello!
I recently bought an A3 8l 1.8T -97 chiptuned to 200hp with a lot of issues. I have fixed all of them but 2
I have no fault codes, I just cleared a "Throttle position sensor; Fault in basic settings" by changing throttle body. I do not have the full version of VCDS so I have not had the ability to calibrate it.
The first problem is that after accelerating and then putting the car in neutral/pressing and holding the clutch the RPM starts to fluctuate between 200-600 and the car can stall while driving. I have recently changed the MAF-sensor. But when I removed the wiring to the MAF while the engine was running, it misfires for a second but then runs well and the problem with the RPM disappears. But since I get reading from the MAF-sensor and that I recently bought it can it be faulty already?
The second issue is that the car is running rich, and it did not pass inspection because of CO-value and low lambda of around 0.97. I have fixed a leak in the exhaust before the lambda-sensor, checked all temp-sensors, changed the MAF-sensor and finally put in new NGK sparkplugs yesterday. I have also tried spraying butane around the engine bay to search for vacuum leaks, but found none. I have also measured on the lambda-sensor and the heating circuit is good and I get a voltage between 1000-500mV
Please, if you have any idea of the cause of any of these two problems please tell me.
Best regard.
I recently bought an A3 8l 1.8T -97 chiptuned to 200hp with a lot of issues. I have fixed all of them but 2
I have no fault codes, I just cleared a "Throttle position sensor; Fault in basic settings" by changing throttle body. I do not have the full version of VCDS so I have not had the ability to calibrate it.
The first problem is that after accelerating and then putting the car in neutral/pressing and holding the clutch the RPM starts to fluctuate between 200-600 and the car can stall while driving. I have recently changed the MAF-sensor. But when I removed the wiring to the MAF while the engine was running, it misfires for a second but then runs well and the problem with the RPM disappears. But since I get reading from the MAF-sensor and that I recently bought it can it be faulty already?
The second issue is that the car is running rich, and it did not pass inspection because of CO-value and low lambda of around 0.97. I have fixed a leak in the exhaust before the lambda-sensor, checked all temp-sensors, changed the MAF-sensor and finally put in new NGK sparkplugs yesterday. I have also tried spraying butane around the engine bay to search for vacuum leaks, but found none. I have also measured on the lambda-sensor and the heating circuit is good and I get a voltage between 1000-500mV
Please, if you have any idea of the cause of any of these two problems please tell me.
Best regard.
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