i have a 2002 dodge ram 1500 with a 4.7l i parked my truck then the next day it would not start. its turning over an im getting spark and fuel to it. ive replaced the cam shaft sensor and the crank sensor on it and nothing. even when i put a lil gas or starter fluid in my throttle body it doesnt start up or even try.... ive tried everything an it still will not start. wats got me confused is ive checked all plugs an they are good. ive checked my fuel pump and its good. i have compression. an all my injectors are good. ive checked all my wiring an have not found ne corroded or loose wires. any help will be much appreciated

 

If you are getting spark and you put raw fuel in the TB something should happen, even if it is backfiring or sputtering . Double check everything you did. Check spark and fuel again.

Usually when something like this happens to me it is something I did.

 

maybe the auto shutdown relay?

 

well i took it to a mechanic today and he said it was eithar my map sensor an plugs or possibly needs a new timing chain.. after it sat for a while it would try to start an there wasnt no noise except the usual exauhst.. he hooked up a computer to it and said im getting good cranking volts an evertything. an the computer said my map sensor wasnt goin up in voltage i think he said when the truck turns over so this is wat im leanen toward at the moment. will no more tomorrow hopefully

 

Be sure to let us know what you find out in the end. it might help someone else out

 

well more bad new, i replaced my map sensor an put all new plugs in it an nothing. The mechanic i took it to said he doesnt know wats wrong with it. but told me if i wanted i could leave it with him an he would mess around with it. Well im not goin to pay somebody fifty bucks an hour to mess with my truck just to see if they can find the problem so now its at home an in the middle of teared the front of my motor down to see if its the timing chain.. Hopefully it is

 

I would run a compression check before you rip into the motor.
Also how did you check for spark ? Did you use a spark tester ? As you could have a weak spark that will look ok if you check by just holding the wire close to a ground but will not jump the gap under compression. This is why you need a proper spark tester that will "load" the ingintion system just like it is under compression.

One like this one for $10

 

no i didnt use a spark tester, nor have a checked the compression. One thing i have forgotten to add if it sits for a while like half a day or so it will try to start but you only get that sound thru ur exahaust for like 3-5 seconds.. this whole thing has got me baffled

 

an this might sound stupid but wat does the compression check tell you?

 

It will tell you if the valve timing is close enough to start the engine. You said your Tech did a cranking Amp check this is also another methood to check compression and you said it was good. And you should have a DTC code if the CAM and Crank are out of phase thats why I think you may be going in the wrong direction and I sugest you get a spark tester and check it again.

You need to explain this sound in more detail. Is it the sound of just air or is it a normal exhaust sound ?