I've replaced the crankshaft sensor distributor ignition coil checked all the fuses replaced my fuel pump still no spark any thoughts or suggestion would help TIA

 

Step 0 - download the factory service manual from the FAQ in the sticky (about 33% to 40% down in the message for the link).

Step 1 - Pick up a real OBDII reader, and see what the ECU thinks is going on.

RwP

 

A fuel pump won't make a difference in no spark. The first thing I would do is check to make sure the ignition system is getting power. You can have all the fuel pressure you want but of nothing ignites it, it won't run.

 

I have a 1996 ram van 3.9L that I hooked a obd scanner up to.
All went well I did have a o2 sensor code that I reset and the truck started and all was good.
I for got and left the scanner connected and had noticed about 5 hours later that the scanner was still connected, so I disconnected and tried to start the engine.
The engine cranks but will not start.
The engine is getting fuel but no spank.
I disconnected the battery and left disconnected overnight still not luck in getting the engine to start.
Could leaving the scanner connected for so long burn out one of the sensors?
I again have connected the scanner and it is showing no codes, I did notice before cranking the engine that the coolant temp was 91,and after cranking the engine it went to -40, could this have something to do with the no start?

 

Most likely there's a problem with the ECT and its wiring, yes; coincidental to leaving the scanner attached.

RwP

 

]Most likely there's a problem with the ECT and its wiring, yes; coincidental to leaving the scanner attached

 

ECT? how do I test ?

 

Buy a new one; plug it in instead of the one in the manifold and see if the scanner sees a rational temperature. If it does, then swap the one in the manifold for the new one.

RwP

 

I was able to pull two codes 12 and 55

 

12 - Backup Voltage Failed within last 50 start cycles (IOW, battery disconnected.)

55 - End of Codes (means That's All, Folks!)

Those alas don't tell us anything, unless the battery's not been disconnected in the last fifty start cycles (and that's more than "Start it up, idle for 15 seconds, turn it off"!)

RwP