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I'm supprised you haven't used the internet to look at all the info on that problem,do that
TryYou Tube Video also
It went on for about 8 years & Ford never did a thing about it,just kept selling defective cylinder heads from 1997 or 98 until 2003,then came out with the 5.4 - 3 valve V8, that has spark plugs that were two piece,that broke as well,and an odd ball 9/16 nut to remove them ,as well as fuel injectors in at least 2003,2004 & 2005 that leak & ruin the exhaust converter & in some cases hydraulic the cylinders & bend rods
Hi there: You will have to pinpoint what the engine is missing... spark / fuel / compression
All three of these are tested when the engine is being cranked over. There are two way of checking for fuel. Fuel pressure and fuel trigger. Both are very important and must be present for the engine to start. Fuel pressure is self explanatory. You just hook up the gage and see what the reading is. Fuel trigger is check with a noid light. The injector gets unplugged and the noid light gets plugged in to the injector clip. With the engine cranking over, this light must blink. This is the signal to the injectors from the computer. You can have all the fuel pressure in the world, but it wont matter if the injector is not pulsing gas into the cylinder like it should.
Compression tester, spark tester, fuel pressure gage and noid light are all accessible at your local auto store. All three tests play a very important part in diagnosing a no start condition. Be extremely careful when doing these tests.
Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.
When you say it won't start do you mean the engine will not turn over with the starter like in a dead battery type of no start, or do you mean the engine cranks over fine but doesn't start? If the latter is the case check the fuel pressure, the test port is on the top of the engine and looks like a tire fill valve, it should be at least 45 PSI while cranking the engine over, you will need to buy a universal fuel injection fuel pressure test gauge from the parts store, about $20.00 should do it.
GO TO AUTO PARTS STORE BUY A FUEL PRESSURE GAUGE THAT CAN CHECK FUEL PRESSURE UP TO 100 PSI. LOCATE YOUR FUEL PRESSURE TEST PORT.LOOK FOR SCHRADER VALVE ON FUEL LINE NEXT TO EGR VALVE.PLACE A RAG NEAR THE SCHRADER VALVE AS YOU INSTALL FUEL PRESSURE GAUGE TO CATCH GAS SPILL AS YOU SCREW IN FUEL PRESSURE GAUGE HOSE FUEL PRESSURE 30 - 45 PSI WITH ENGINE RUNNING. THE ENGINE MUST BE OFF HOOK UP THE FUEL PRESSURE GAUGE.IF YOU HAVE TROUBLE THE FUEL PRESSURE GAUGE WILL HAVE INSTRUCTION HOW TO HOOK UP FUEL PRESURE GAUGE.BE CAREFUL CHECKING FUEL PRESSURE IS DANGEROUS JOB.DONT ALLOW NO MASSIVE FUEL SPRAYING WHEN HOOKING UP FUEL PRESSURE GAUGE YOU WILL GET CAR FIRE.
Here you have 3 reasons:
1.- Fuel problem: Make sure the fuel is getting to the cylinders at a good pressure
2.- Spark problem: Make sure there is spark at the plugs
3.- Compression problem: Low cylinder compression is a less common cause.
The low pressure valve on the 01 expedition is located on the accumulator on the passenger side fire wall. The accumulator is underneath the battery relay and a grouping of wires. Had to squeeze hand underneath a heater hose and an a/c line to remove cap and hook up hose. Nothing has to be removed to locate the valve just a little touchy feely. Valve faces a 45 forward toward the engine.
On the engine there is a tube that supplies fuel to the fuel injectors, on that tube there is a valve, like a metal tire valve, this is the fuel pressure test port, you will need a special guage to check the pressure that screws onto that valve, Kragen and other parts stores sell this test kit, it is very inexpensive, about $20.00, but cheaper than having a shop do it for you, if you do the test and you have no pressure while cranking the engine then your fuel pump is bad, the pump is in the gas tank, a big job and dangerous due to chance of fire if you are not cautious.