Wow, that sounds like you have no compression. Check your timing belt it may have snapped. Unfortunately, the 4.7L motor is interference so you may have valve damage. You can remove the passenger side timing cover pretty easy its 4 or 5 bolts i believe. Just remove your air intake hose and removing the serpentine belt helps but not required
Let me add you can also remove your oil cap and look at the cams and see if they move while you try to crank it. If they don't move then you know the belts broken
Last edited by ToyoGuard; 05-24-2012 at 01:49 AM.