I have a late 02 2.5 Outback
Recently on start up for first 10mins it was misfiring. I traced this to arcing on the coil pack from plug lead4 to the coil pack itself. A clean up and it has been 100%
All went fine for 2 months, then :-
It is now misfiring at high revs/under load, ie not at tick over as before. The more the load/higher the revs the worse it seems to be
I have checked out the OBD and it has not come up with anything conclusive. Im told it could be :-
MAF - wouldnt show an error
Blocked fuel filter/weak fuel pump starving engine of fuel. Probably show an error though ?
First sensor in cat, ie in front of it ? However diagnostics have checked this and say it is normal. (Back sensor flucterating around 2.4v and front one a fair bit lower at around 0.5v, from memory) As said, Im told this is normal
Anything else that it could be, as said there are no obvious errors
Plugs were changed about 20k miles ago and car done 100k on original leads. However these look to be good
If I were to get a new coil pack off ebay, what other models would fit my car? The impreza ones advertised look identical. Would any 4 cylinder coil pack at around the age of my car fit ?
Thanks in advance