So, my Expedition was running rough, so I decided to try changing the plugs. I finished that nice little feat last night with only one problem. I seemed to have dropped my 7mm socket down in the valley of the engine below the intake. I cannot get to it, so I have written it off for now. I noticed that everyone removes the power steering resevior, but am unsure why. I got that coil pack out without any trouble.

Anyway, I used Bosch Platinum+4 plugs, and when I cranked up the engine, the engine still runs rough. I wasn't triggering any codes before the plug change, so how does one tell if a coil pack is bad? Remove it and check the resistance? Just buy one and start swapping? I did remove the PCV valve and the hose assembly, and everything looks good there. No cracks or splits. I have a new valve to install anyway.

Any ideas would be appreciated.

 

As far as the socket is concerned...Have you tried Mechanics Fingers? I couldn't live without mine!

I'd like to give my 2 cents on the rough running but you didn;t go into enough detail about it. Want to?

 

I had the same on a 99, no codes and always worst in the am, after changing/swaping 4 cops and plugs I finally found the problem a failing plug and coil.

 

Sure thing Monsta. It seems that my engine runs rough from idle to about 2000 rpm, then smooths out. Almost like a miss. I have run fuel injector cleaner, now changed plugs, and it is still there. My next thought was a bad coil pack, but I have no way to check those other than swap them out. I think I am going to try disconnecting each coil pack while the engine is running to see if I find one that makes a very small change. Other than that, I am not sure where to go from here.

As for the socket, I cannot seem to get it with my mechanics fingers. They don't seem to get into the area where the socket has disappered to. I would think I could get under there from the back side of the engine, but there's not enough room for me to reach down there.