A4 V6 2.4 misfire at speed

[wmccann]

Hi,

My 2.4 BDV was throwing misfires on cylinders 2 & 4 but only at speed (130kmh +) on the motor way and only after a few minutes of "hard" driving. No issues at other speeds, high revs etc. As soon as I go under 120kmh the CEL light stops flashing and all returns to normal.

Changed the coil packs and now get it on cylinder 2 & 5, again only when at speeds over 130kmh.

Engine is very smooth otherwise and no power issues etc.

Any help is much appreciated,

Thanks in advance,

W.

[burkey1]

Had coil packs fail in many different ways on my 4 cyl 1.8t in the past, but always the coil pack was the culprit.
Constant flashing CEL with engine labouring to intermittent flashing and misfire at high speed/ under load (similar to what your experiencing).

i presume you are using some form of diagnostic tool to pinpoint cyl 2 + 5.
if so then move both coil packs to see if the issue follows the suspect packs.