Truck won't start

[bugaboo1]

So it is winter and 2 months ago my truck wouldn't start it acted like it wanted to and didn't. Replaced battery and idler air motor. Worked great for 2 months and now it is doing the exact same thing. When it runs it runs and idles perfect. What could it be

 

[bugaboo1]

Bump

 

[jwheeler]

Just saying that it won't start leaves a lot of questions. When you turn the key, goes the engine crank? Just click? Do nothing at all?


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[bugaboo1]

It cranks fine acts like it wants to fire but don't there is fuel pressure and spark last time this happened the idler air motor fixed the problem for 2 months but doing the same thing again

 

[RonJon '06]

If replacing the IAC helped before then I would try taking it out and cleaning it. Maybe a bad crank position sensor? I would try posting in the 2nd Gen section since there are a lot more 5.9 guys over there. Good luck.

 

[korby05]

Mine is doing the same thing. My mechanic said it's more than likely the crank position sensor. Which is on top of the bell housing on the transmission