Has Compression but wont start

[25psi_talon]

i have a 90 gsx that has 140 compression across all 4.... but it wont pop over..... i just changed the ecu and i have like 6 laying around so i kno its not that.... what could be my problem...... right now my firing order is 4123 and i was going to change it to 3214 to see if it starts but its too late now so if u have any ideas i would love to here them thanks for reading and i kno u guys can help

 

[SlushBoXRacer]

do you have spark and fuel? why did you swap out the ECU?

 

[esndin]

check the simple stuff first like the cps (crank pos. sensor) and the cam pos sensor, if they arent giving a proper reading it will crank allday but will not engage the ignition and fuel systems, also check the resistance on your coilpack if my memory serves me correct it should be between 11-13 resistance, also on the fuel rail there should be a sharader valve looks like a valve stem on a tire, use something and press down the plunger to make sure you are getting fuel ehh those are just a few ways also i dont know if the 90s had the relays on them but if they do check your relays up by the driver side firewall how this points you in the right direction or at least in some direction

 

[GSXSixteenG]

check the simple stuff first like the cps (crank pos. sensor) and the cam pos sensor, if they arent giving a proper reading it will crank allday but will not engage the ignition and fuel systems, also check the resistance on your coilpack if my memory serves me correct it should be between 11-13 resistance, also on the fuel rail there should be a sharader valve looks like a valve stem on a tire, use something and press down the plunger to make sure you are getting fuel ehh those are just a few ways also i dont know if the 90s had the relays on them but if they do check your relays up by the driver side firewall how this points you in the right direction or at least in some direction

1g's do not have a cps. Like stated above check to make sure your getting spark and fuel. CAS is a common culprit. Check for fuel at the rail and pull the plugs one by one and check for spark.

 

[esndin]

doh! my apologies