v6 24 valve dohc
It can be any one of the things you mentioned and a few more. Check the resistance on the primary side of the coil. Leave one lead on pin 4 of the unplug coil. Then one at a time check pins 1,2,3 with the other lead. The resistance is one to ten ohms. Then check the secondary on each coil wire terminal partner. 1&5 2&6 3&4 the resistance is 12,000 to 15,000 ohms. The spark plug wires is no more than 1000 ohms per inch of wire. (5 inch wire=5000 ohms) I would replace the plugs if it hasn't been done recently. If you have access to a scope that would be the best way of checking the ignition. If you don't do it the way I described above. When it says cylinder #3 it is referring to the third cylinder in the firing order. Witch is 1,4,2,5,3,6. That means it is cylinder number 2 that has the problem. I will send some info on it. Don't forget it can be injector, fuel pressure, air leak, ect.... Let me know if you need more help.
A.S.E. Certified Master Technician, L-1 37 yrs. Auto Repair Experience
i changed the plugs & wires cleand the egr valve runs smoother but at 1000 to 1500 rpm i feel a vibration above that its smooth the new plugs & wires helped but its not there yet
when i removed the #3 plug the tip was black with carbon build up. thank you
Relist: I still need help.
If the misfire was diagnosed with a scan tool it will be #3 cyl, but if using certain scopes would be #3 in firing order which is #2.
Run a cyl leakdown test on #2 and you will probably find a leak to exhaust on #3 cyl. due to a burned exhaust valve. These engines tend to burn the exhaust valve on either #3 or #6 cyl for some reason, possibly due to furtherest from incoming cooled coolant. I have found this on several of the 3.0 duratech engines and always #3 or #6.
I jope tyhis helps, if so please accept.
Glenn Irvin, Ford Dr.