So my bros 06 screw 5.4 is intermittantly starting. Its cranking over more then starting. thats all the info I got right now, going to put the reader on it and see what comes up. Any ideas?

 

Check the FPDM for corrosion. Get the maintenance history.

 

X2. On the frame cross member above your spare tire.

 

Well we had a look at it and looks ok, but we did get it started by holding the peddle to the floor untill it finally fired and it took 3 or 4 times of this before it stayed running. No codes were thrown either.

 

That's a symptom of leaky fuel injectors.

 

Could be the fuel pump as well. My wife expo did the same thing ended up being the check value was bad , it would let the fuel drain back to tank and not keep the fuel line pressurized . Letting it crank for a few allowed the fuel to get to the engine.

 

But holding the peddle to the floor cuts the injectors off so it sounds like it is getting flooded by leaky injectors.

 

Well since then he says it hasn't had a problem starting

 

well it finally quit on him.. we replaced the fuel filter, still just cranking over. replaced the fuel filter, same thing. replaced the pump, same thing. the pump isnt turning on and the fuse is good, the manual doesnt say anything about a relay, and it says the fuse is for the 4.2, this is a 5.4.... we need your guys help!!!

 

oh and we tried the fuel pump driver modual and still nothing!!!

 

Check the crankshaft position sensor harness connector...the CPS very, very rarely goes out, but the harness connector is known for issues...wiggle it, it may start...if it does, Ford has a repair kit for the harness connector.

 

there arent any codes being thrown either! the sensor and harness are covered in a pile of mud or dirt but so far looks ok...

 

FOUND IT!!!! turns out there was a corroded contact in a plug along the frame rail under the drivers door. spliced it together and it runs!!!