2001 4.6L with P0304 Code. Started after I filled with gas...possible bad gas? Says Cyl 4 Misfire Detected. Shutters and no power. I put in dry gas and lucas but I am still trying to run the tank out. Any ideas?

Thanks,

Herf

 

Having started after a fill up could be a fluke. #4 has some issues with ign problems. If the gas additives don't help and it persists I would search some of the threads relating to cyl. #4 misfire.

 

I would pull the #4 coil and make sure there isn't anti-freeze causing the misfire. That lousy clamp on the heater hose is usually the creator of such codes.

tom

 

It is still shuddering and I still have a little more than half a tank of gas left. I looked at the the #4 coil pack and it does not appear to have anything dripped on it. I reached up and rubbed the hoses and did not feel and moisture. When the problem started on Tuesday, it was a cold, all day rain deal. I am unsure if this is significant. My plan at this point is to run out more of my current tank of gas and then refill (at another station) and see what happens.

In the meantime, could you provide some instuction on removing the coilpack. Also, where is fuel filter located and is it accessable?

Thanks Pestco1 and Tom for you input,

Herf

 

To remove the coilpack:

Remove the wire connected to it (using your index finger, put it on the bottom of the connector, push up, pull away...your finger needs to be toward the edge of the connector, right after the wire goes in).

Get a 7mm socket, whatever ratchet extensions you may need, and take out the 7mm bolt holding the pack on, after than you just pull it out. Be careful not to get any dirt in there.

If you need more info, do a search here on "spark plugs" and there should be plenty of threads on removing them (which would involve taking out the coil packs).

Got this page from this forum, he shows how to remove one in a video:
http://home.midsouth.rr.com/lightnin...parkplugs.html

 

Guess it isn't always the hose clamp that does it. The hose hangs over this coil so it will drip any moisture that accumulates on that coil.

It won't usually been seen until you have removed the coil. You will see once you have removed the coil that hole holds a lot of water before it fills up.

I would think gas would for sure cause more than one to miss.
tom