no fuel no spark???????????

[yellowvdub]

ok its a 91 mazda navajo i changed all three relays they all work checked fuses... fuel pump does not turn on and i have no spark.... i also swapped out the ecu too
i have a whole other parts car

 

[glfredrick]

ok its a 91 mazda navajo i changed all three relays they all work checked fuses... fuel pump does not turn on and i have no spark.... i also swapped out the ecu too
i have a whole other parts car

Did you check the fuel inertia switch under the dash? It is designed to cut off the fuel supply in the event of a roll over, but sometimes they pop for no particular reason.

 

[marragtop]

Also make sure the wire at the bottom of the inertia switch is firmly attached.

 

[fixxxer]

Make sure the number's on the ECU match, there were slight differences in the first few model years

 

[MrShorty]

Check the rest of the engine management power supply wiring.

Is the fuel pump priming? If so, maybe there's a problem in the CKP/PIP/TACH signal, which are necessary for spark, and the computer won't turn the pump on until it sees the TACH/PIP signal.