Engine dropped a multiple cylinder misfire code a couple months ago, this included cylinder 6. Replaced spark plugs and problem was solved.

A few weeks after, engine dropped "P0306" again. Replaced coil pack and cleared codes.

A few weeks ago, the engine dropped code "P0306 - Cylinder 6 Misfire." Replaced the sparkplug and cleared codes.

Yesterday, the engine light came back on, and its throwing "P0306" again. Here's where my question is; What do I try next?

 

a misfire is NOT just,,,,,,,, not getting SPARK,,, damaged wires. move around coil packs.

lack of fuel... lack of air....lack of compression.

fuel injector. valve not opening ... intake or exhaust. NO or low compression. broke valve... broken valve spring... dislodged valve seat.

 

mine did that but on the 3&4 cylinder.I couldn't figure it out at all.I talked to the orielly guy ( the one that actually knows what he's talking about). He asked me if i had put any grease on the spark plugs when i put the new coils on?. I had not!. I put spark plugs grease on and it hasn't happened since

 

Do a compression check, possible broken valve spring.

 

When mine broke a valve spring, it ran very rough and wouldn't idle at all. The 2005s have the improved valve springs. Swap the injectors around to see if the code moves.