hi, since I've owned my Audi the only real problems i've had have been EGR valve related.

i replaced my last 1 with a siemens, it lasted 18 months.it still looked brand new but would stick open 1mm when slightly clogged.
this caused my car to smoke under acceleration a lot more than normal.

my mpg hit rock bottom, it was running rich i think.

anyhow, i removed it and cleaned it 3 times in 3 months.

i was left with 2 options, new EGR valve or remap and EGR delete.

i went for the remap and delete. the car runs great, more power, torque, but today with the windows down, i heard a hissing from 1500 rpm uupwards.

my questions are this, if it doesn't use the EGR what route do the gases take ?

do you think the hissing is caused by the gasses being re routed or have i split a pipe ?

if so, which pipe would it be cos it all looks good to me from a quick gander under the bonnet.


thanks in advance,