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Thanks Tylus... that's good to know. Having read all of the posts regarding that issue I was hoping Ford had actually done something to correct it. I also have a '04 Expedition with the 2v 5.4. Haven't attempted to change the plugs on it but feel it's time with 85K on the odometer. Do the two valve engines have the same issue?
We all knew about the blowout problem on the 2 valve 5.4's,I thought that problem was fixed when the 3 valve 5.4 came out with MORE threads per plug BUT that MADE a problem trying to change the plugs and having them break off,something about the threads being below the bottom of the head and carbon/soot building up on the bottom of the plugs causing them to bind up in the head on the way out,what's the story now?????.
2002 F350 4 door Dually XLT lariat PSD Crew Cab 4R100 4.10 VDH4 Prepump, In-Tank, Crossover,Tymar air intake, Edge Evolution, Magellan 6000T GPS, White Night backup light's, DPPI Guages, Walker "Big Truck" Muffler, b&w turn over hitch, pulling a 2004 sunnybrook 31 bwks with 3 slide's, truck & RV 20,900 #'s all at the scale .
here is the lowdown on the spark plugs from about 2000 to current
problem seemed to surface when Ford started using the PI heads. spark plugs ejected from the head due to insufficient threads in the head. repairs required either a heli-coil or insert...or a new head.
it's completely random and can happen to anyone. Some people never have it happen...and some poor *******s have it happen one after another
spark plugs are a multiple piece design that is tack welded together. Ford also increased the threads inside the head to fix the blow-out issue...the nature of the 3v head made for an extremely small space where the plug penetrates the cylinder
carbon from the ignition process and unburnt fuel collects around the spark plug. this causes the spark plug to get caught. the tack weld breaks and the plug will come out in 2-3 pieces.
doesn't always happen...but it's a definite possibility
in late 2007 Ford issued a redesigned head that went back to a traditional sparkplug.
motors built after Nov 2007 have the new design head. So if you are looking at a 2008 model Ford, you need to look at the drivers side head. it will have a build date sticker on there. You want one built after the revision was issued.
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