Cylinder 3 Missfire!
 

My 02 3.4L has a code of P0303 (Cylinder 3 misfire)

I cleared the code, and swapped positions with 2 coil packs, same code came up once again.
(coils are good)

Put a brand new spark plug in cylinder #3, Same code came up ( plug is good)

I tried switching wires around, hoping the misfire would change location, still same #3 cylinder misfire error came up.

So I have ruled out the Plug,wires and coil pack. I'm not sure what the best route would be to go at this point.

Any Ideas? Thanks

Injector

How difficult are they to get at?

Try this you tube vidio, see if it works for you. I have a 96 lumina that had a misfire on #6. Did what tis vido showed, worked.

I will give it a shot tomorrow, Thanks

were you able to get at your injector without removing the cover on top?

yes, yours might be harder due to it not being on the outside of the engine.

So I have ruled out the Plug,wires and coil pack. I'm not sure what the best route would be to go at this point.

I was able to get an extension in there and tap at the injector, but it did not seem to work for me, i hit it hard enough, but not hard enough to damage the plastic.