Ok I have a 91 Da, I have spark and fuel and timing is correct but engine will only crank.. Won't start.. Checked every relay and fuse and changed my ecu to another pr4 too see if it was ecu and that's not it either

 

checked codes?

 

Ya there are no CEL codes nor light coming on.. I turn the key to on position and it turns everything on correctly.. MFR is working too and I get good pressure for fuel and good spark but motor won't start still..?? I changed ecu out for ***** and giggles and nope still nothing??

 

Even when I do jumper trick to the green and brown clip too.

 

to check codes on non-obd, there's an led on the ecu which flashes the code. you don't have to jump the service connector. the ecu's led will flash as soon as you turn the key to run
is that how you checked it?

 

Yeah count how many flashes it has, I wasted a whole week not knowing it was different to check codes on the OBD0