hello fromgreece,i have an audi tt 2002 1.8t with full forgedbottom end,full valvetrain and precision 6162 turbo!
at idle i have p0300,p0301,p0303,p0304 code at vcds
the misfire counter raise up a bit at idle,at cruising i have misfires only at part throttle and under vacum,at wot the car runs fine ,no timing retard at 8350rpm and 24btdc!
1)4coils with new
2)check coil harness its ok
3)vac test,no vacum leak
4)new oxygen sensor
5)change the injectors visa versa and nothing change
6)throttle body allignment
after the throttle body allignment the misfires start at 4th cylinder and go crazy up(70-80-90 at idle)
the cylinder 1 has no mossfires,the cylinder 2(which never misfire)has 1 misfire and the cyl3 6misfire
the vacum is steady at 350-360mmhg at 860-864rpm
the car run great and the afr is between 0.994-1.023
the apexi avcr at ignition show 4.116v for the throttle body and there is a mismatching between the avcr and the vag com
the avcr show 5% the vcds 6.4% and go on,after 60-70% they show the same