okay....its a 90 rex dx, theres two wires on the back of the block...above the oil filter with like a rubber cap covering the two female ends of the wires...ones yellow with a green stripe the others black, does it matter where there plugged in or can they be switched and not affect anything??? as in left or right or vice versa........thanks

 

id love to say its a coolant temp but im 2% sure lol. there was a thread on this a while back. google engine block sensors on that engine and click images it might help u

 

it's your coolant fan switch. it doesn't matter which wire goes where.

 

awesome....thanks bro..

 

damnit....why isint my main relay clicking, and i know its good for a fact, im getting no fuel pump prime or anything......AAHH.so irritating!!

 

Test your ground at the Thermostat and frame rail.
Do you have 12 volts at the battery?

 

yep all grounds and connections are good....

 

are the injectors powered by the ecu? or grounded by the ecu?

 

ok...so i did c1 and c2 over to b10 and b12, ran c1&2 into the engine bay, hooked em up, did A3 and A7 for the injectors also hooked them up.....NOW the two yellow/black wires that were with the injectors, i hooked them to the resistor box but they do nothing, after testing them, when i touch them to a hot wire they turn on the fuel pump??

any ideas whats goin on? i need serious help here........

 

The 4 yellow blacks are supposed to get 12v.
It sounds like when you hook it to 12v then it's sending power to the injectors AND feeding back through to the main relay.
I wouldn't doubt it if your car starts if you leave 12v to the ECU side of the resistor box.
Do NOT hook 12v direct to the injectors... it needs to pass through the resistor box or else you risk frying the injector.

My guess is that your 12v supply to the main relay is bad.

 

i know that....but the stock 2 yellow/black wires that went to the stock dx injectors.....where do they go? and whats there purpose??

 

Their purpose was to provide the injectors with 12v (not ground).
They run straight to the main relay.

Check fuse in your fuse box under the hood to make sure your main relay is getting power.

 

i used a tester light and the harness is getting power at the main relay, the ground is also good at the harness, i pulled a relay out of a running car too just to see if that was the problem and still nothing.......i just dont get it