I went to start my truck the other day and it wouldnt fire up.2001 5.4. about 89000 miles. Checked Air(Replaced MAF and Filter and ran meter)--good ----Fuel--to the rail/good ---Spark--pulled the plugs and replaced. New Battery,New Filter. New Fuel Relay, Checked all fuses and connections and metered. Checked with OBD II and got no codes. It turns over fine, just wont fire. ANY IDEAS!!!

 

It could be a lot of things. Are you getting any spark? Does it try to fire, then choke down? If so then it's probably the IAC valve.

 

I got spark, it doesnt fire at all. Doesnt cough,stutter,or make any noise that it sounds like it about to fire up just the sound of the starter rotating.

 

check the crank sensor and cam sensor... those will go bad and cause this problem.

 

Sounds like an idea to me. When a fuel pump goes out, It'll do the same thing. I know you said that it was fine, but just make sure!

 

I went out today and double checked the fuel pump with a meter and the voltqge was within specs. Pulled the gas rail to the injectors andhad gas there at point. Checked the fuel cutoff and it was fine. Dazed and confusd now( not that really hard for me considering)