Year of Manufacture *: 2002
Engine Code or CC *: BAD
( Optional ) Scanner Used: VCDS
16684 (P0300) - Random Cylinder Misfire Detected
16685 (P0301) - cylinder 1 misfire detected
16686 (P0302) - cylinder 2 misfire detected
Replaced the coils on 1 & 2 with genuine Audi ones, fault still evident.
Removed & inspected/cleaned plugs, all look OK.
Swapped the spark plugs from cylinders 1 & 2 with 3 & 4, fault didnt move, stayed on cylinders 1 & 2 (so not the plugs).
Measured supply voltages and checked grounds on the ignition coil supply wires - all OK.
Visually inspected coil supply wiring for chaffing/wear - none found.
Cleaned the MAF (as i was there anyway), made no difference (as expected).
Did a compression test, all cylinders good and balanced.
Checked for air leaks, none found.
Clearing the fault lasts for about 1 minute on idle before the EML lights again with the same codes.
However, the flexi-metal pipe from the EGR valve to the exhaust manifold is blowing (split in the flexi-section) - could this cause the problem i'm seeing? Its booked in to have that pipe replaced anyway but i'm unsure as to whether this could cause a misfire in just 2 cylinders (EGR vlve is adjacent to cylinders 3 & 4 on the manifold...).
Any ideas?
