Weird shaking/chugging noise + low fuel economy

[redex98]

Hi,

I have just bought a 2015 Audi A5 2.0 TFSI and have noticed a weird noise and feeling, I'm not sure what forum this would be classified under.

After having the car switched on for 10 mins (regardless of idle or actually driving for 10 mins), the car starts to shake and make a weird chugging sort of noise. The revs also start fluctuating wildly between 800-1100 (car idles at 900 normally). Once moving off / applying gas, this seems to stop at least for a while but might come back a few minutes later.

Once 15 minutes has passed, this will not happened again at all for the rest of the drive. As the weather has gotten colder, this issue has gotten worse, with the car actually stalling and shutting off multiple times.

There are no fault codes on the dashboard, nor any fault codes when scanned with my OBD reader. The car is perfect otherwise, and drives and changes gear completely fine.

I'm not sure if this is related or not, but I'm also getting terrible fuel economy: low 20's when in efficiency mode driving around town at night, usually on 30mph roads and trying to be gentle with the gas.

Has anyone else experienced this/ knows about this issue? From what I've read online, it sounds like it could potentially be the MAF sensor being faulty, but I could be wrong. I have recorded a video below to show the sound and revs:
View: https://www.youtube.com/watch?v=VazhMBLywog

Thanks in advance.

 

[localknoxville]

Hi,

I have just bought a 2015 Audi A5 2.0 TFSI and have noticed a weird noise and feeling, I'm not sure what forum this would be classified under.

After having the car switched on for 10 mins (regardless of idle or actually driving for 10 mins), the car starts to shake and make a weird chugging sort of noise. The revs also start fluctuating wildly between 800-1100 (car idles at 900 normally). Once moving off / applying gas, this seems to stop at least for a while but might come back a few minutes later.

Once 15 minutes has passed, this will not happened again at all for the rest of the drive. As the weather has gotten colder, this issue has gotten worse, with the car actually stalling and shutting off multiple times.

There are no fault codes on the dashboard, nor any fault codes when scanned with my OBD reader. The car is perfect otherwise, and drives and changes gear completely fine.

I'm not sure if this is related or not, but I'm also getting terrible fuel economy: low 20's when in efficiency mode driving around town at night, usually on 30mph roads and trying to be gentle with the gas.

Has anyone else experienced this/ knows about this issue? From what I've read online, it sounds like it could potentially be the MAF sensor being faulty, but I could be wrong. I have recorded a video below to show the sound and revs:
View: https://www.youtube.com/watch?v=VazhMBLywog

Thanks in advance.

I've just had a very similar issue with my 2.0TDI, the revs were bouncing up and down on idle between 800-1000
There was no warning lights on the dash and no fault codes either but as it got worse a fault code come up: P1065 Fuel Pressure Regulator
I have now fitted a new Fuel Pressure Regulator and Fuel Pressure Sensor and car is back to normal and no crazy revs on idle

 

[redex98]

I've just had a very similar issue with my 2.0TDI, the revs were bouncing up and down on idle between 800-1000
There was no warning lights on the dash and no fault codes either but as it got worse a fault code come up: P1065 Fuel Pressure Regulator
I have now fitted a new Fuel Pressure Regulator and Fuel Pressure Sensor and car is back to normal and no crazy revs on idle

Did you also have terrible fuel economy and could smell diesel? my fuel economy is terrible right now, averaging below 20mpg around town.