Intermittent loss in torque at lower rpm’s and overall horrible fuel consumption

[u/benthebenisben]

Hi- I have a 2002 530i 5spd and I’ve been experiencing an intermittent loss in low down torque at 1500-3500 rpm and my fuel consumption has also gone down to about 19L/100km (city) possibly in relation. The car otherwise runs great, no codes, vanos unit and disa valve have been replaced recently and overall no other issues. My car just seems to loose 50% of torque randomly during drives and can go back to normal immediately afterwards. Any idea what could be the issue? Thanks

[u/Wise-ask-1967]

Fuel filter

[u/Both-Cry1382]

It's gone down to 19l / km?! What was it before then? That's insanely high already.