I have a 03 Dodge Ram 4.7 driving me crazy. Ran just fine when parked, 20 mins later no start.
Only code it gave me was coil packs. Ive Replaced the Coils, Plugs, Fuel Pump, Cam sensor, Crank sensor, Air intake sensor, and still got nowhere with it.
No codes now but check engine light is still on.
If it sits for a day it'll turn over on the first crank for about 5 seconds, then nothing after that first crank.
My Timing seems to be good when checking TDC.
I have spark on every plug, and it's getting fuel.
Even tried using starter fluid, but it blew the starter fluid back out of the intake???
Thought about replacing the TPS, haven't yet. Currently sending the CPU off to get tested.
GIVE ME IDEAS PLEASEEE & THANK YOU, I NEED THIS TRUCK RUNNING.

 

If it wouldn't suck in the starting fluid, suspect plugged exhaust. Had a cat once that blew it's guts and plugged my exhaust. If you have a test bung in front of the cat. Pull it and see what happens.

 

I Have flow through my exhaust when cranking, I even cut the cat just to be sure

 

You need 4 things. Fuel, spark, compression & spark at the right time. It seems you're just throwing parts at it.

 

I have fuel, have spark on every plug. The compression is a little low as I would expect but it ran okay before this issue. How could I check the spark order? Debating on sending the cpu for testing. Still doesn't make sense to me

 

Are you getting injector pulse? Fuel pressure good?