My X developed a very modest and occasional slight 'sneeze' or delicate 'cough', while idling waiting at lights. In park there was nothing to notice and when moving, again nothing to notice. However, not right.
I plugged in the Tech II and it has a diagnostic function that displays a mis-fire counter for each cylinder and there, #4 was showing a mis-fire count. So I removed the coil pack and swapped it with #2. The Tech II now reported #2 with the mis-fire count. To confirm further I went round each injector in turn and unplugged it (one at a time), for each cylinder there was a very, very slight change in revs, except for (now) #2. (I did the same test with the suspect coil pack in #4, same confirmation result.)
Ordered new set of four coil packs. Easy to fit, the new design is a different coil pack from the ones I have, I can't swap just one, however the whole module (ie all four) simply swap in and out, easy to do. The left and right coil pack modules are the same.
For reference, #2, #4, #6 and #8 are the left hand bank, #2 is at the front; #1,# 3, #5 and #7 are the right hand bank, #1 is at the front. Left/right designations are as if sat in the driver's seat, looking forwards.
I plugged in the Tech II and it has a diagnostic function that displays a mis-fire counter for each cylinder and there, #4 was showing a mis-fire count. So I removed the coil pack and swapped it with #2. The Tech II now reported #2 with the mis-fire count. To confirm further I went round each injector in turn and unplugged it (one at a time), for each cylinder there was a very, very slight change in revs, except for (now) #2. (I did the same test with the suspect coil pack in #4, same confirmation result.)
Ordered new set of four coil packs. Easy to fit, the new design is a different coil pack from the ones I have, I can't swap just one, however the whole module (ie all four) simply swap in and out, easy to do. The left and right coil pack modules are the same.
For reference, #2, #4, #6 and #8 are the left hand bank, #2 is at the front; #1,# 3, #5 and #7 are the right hand bank, #1 is at the front. Left/right designations are as if sat in the driver's seat, looking forwards.
