Ok so here is my issue guys.
I own a 1999 Mazda 4x4 3.0 the motor over heated and cracked the heads so I planned to swap it for a 4.0 from a 4x4 2000 model ranger. I found a whole truck that was from a roll over. I finished the swap and now the truck won't start.

Scenario 1
3.0 computer, pats, key and ignition plug all replaced and nothing happens.

No fuel and no spark

Scenario 2
3.0 computer, pats, key and ignition plug kept in and it tries to start but does not stay running.

Gets fuel and spark but does not seem to keep spark.

I was wondering if there was something wrong with the computer from the 4.0 since it was a roll over.

It would be very easy if I could just bring it to a dealership but I'm located in Central America where the closest dealership is 8 hrs away. It would be great for some help.

Thanks,
Jakes

 

check the crank position switch and coil...i highly doubt its a computer issue...do you have compression across all cylinders....usually roll over motors have some internal issues from fluids getting where they dont belong

 

Before installing the motor I cleaned it up and turned it over with the spark plugs out. Also the compression is good on all 6.

 

id say check the crank sensor

 

I'm replacing it with the old sensor right now. The one from the 3.0 looks the same as the 4.0

 

Does anyone know why it won't run on the 4.0 computer?

 

Ok so with the next crank sensor in it does the same thing. Does not want to stay running. Any other ideas.

 

getting fuel pressure?

 

Got fuel pressure

 

id check the coil next