This is a friend's car, with roughly 150K km (95,000 miles) on it. It has a 3.0 l DOHC V6, which I assume is the Duratech. It runs well at idle and under low load, but triggers the CEL when pushed hard. The code is P0302 (misfire on #2).
I'm having trouble finding the cylinder numbering. Lots of contradictory information out there. The consensus seems to be:
FIREWALL
___________
1 2 3
4 5 6
__________
RADIATOR
Can anyone confirm this for me?
If this is correct, #2 is underneath the IM. Doesn't look too hard, although of course the front bank would be easier.
I pulled the middle plug on the front bank (#5, if the above is correct). It was clean, with no carbon build-up or oil fouling.
The owner thinks they were replaced not long ago, perhaps 5000 km (3000 miles) ago.
Therefore, I figure the #2 coil (it's a coil-on-plug layout) is probably bad.
I think this is a wasted-spark ignition system, and therefore at least one bank should be running double-precious-metal plugs. The one I pulled on the front bank was a standard plug, probably platinum.
So, at this point my plan is to pull the IM, and replace at least the three coils on the rear bank, and possibly replace the three plugs on that bank with double-precious-metal plugs.
It's quite possible the coil is OK, and the plug is breaking down under load, but it makes sense to change the coils while the IM is off. (And check the VC gasket, and replace it if it's leaking.)
Thoughts? Thanks, all!
I'm having trouble finding the cylinder numbering. Lots of contradictory information out there. The consensus seems to be:
FIREWALL
___________
1 2 3
4 5 6
__________
RADIATOR
Can anyone confirm this for me?
If this is correct, #2 is underneath the IM. Doesn't look too hard, although of course the front bank would be easier.
I pulled the middle plug on the front bank (#5, if the above is correct). It was clean, with no carbon build-up or oil fouling.
The owner thinks they were replaced not long ago, perhaps 5000 km (3000 miles) ago.
Therefore, I figure the #2 coil (it's a coil-on-plug layout) is probably bad.
I think this is a wasted-spark ignition system, and therefore at least one bank should be running double-precious-metal plugs. The one I pulled on the front bank was a standard plug, probably platinum.
So, at this point my plan is to pull the IM, and replace at least the three coils on the rear bank, and possibly replace the three plugs on that bank with double-precious-metal plugs.
It's quite possible the coil is OK, and the plug is breaking down under load, but it makes sense to change the coils while the IM is off. (And check the VC gasket, and replace it if it's leaking.)
Thoughts? Thanks, all!