i recently bought a full b16a2 swap for my 95 civic hatch. the engine wont start. i am getting spark. the injectors are all wired correctly, it cranks but wont start. it starts on starter fluid. the injectors are not firing. they are getting fuel from the fuel rail but wont fire. when i took the fuel rail off they didnt fire, but right after i cranked it they all fired at once. i have no idea what is wrong with it so please help!

 

What ECU and engine wire harness?

 

with the key in the on position, unclip one of the injector connectors and check for voltage at the connect with a test light

 

the injectors all get power.

 

You risk thread closure by not supplying basic information about your swap. Read the forum rules in the stickies at the top.

 

its an obd1 harness D series, but converted to obd2 plugs and everything. and the ecu is obd1. i dont know what specific ecu it is. how do i find out? i am very new to this.

 

The injectors work by grounding the power, so if you have power to the yellow wires, check the red, blue, yellow and the other wire back to the ecu.

Are you sure the fuel pump is coming on? It's common for the main relay to fail and not turn the fuel pump on. Or the Q101 (thermostat housing) ground can get corroded and cause issues.

 

what sensor controls fuel injection again? ckp or cam?

 

Remove the passenger kick panel to see what ECU you have.

If you have an OBD1 ECU, check whether ECU connector terminals A23, A24, A26, and B2 have continuity to body ground.

The timing for firing of both spark and injectors requires the CKP sensor, but this is not the problem if you have spark.

 

Its a P30 ecu. and all of the grounds to the ecu are good.

 

Did you test them with a multimeter?

 

Yes. they are all good grounds.

 

Swap in a known good ECU.

 

i have tried that. no difference. and my ecu started my buddies car. what are the colors to the injector plugs?

 

Why not mention relevant information like swapping in a known good ECU in the first post? Any other important information that you have omitted?

What color wires are in injector plugs 1-4?

Are the injector ground wires properly pinned to the ECU?

 

How do you know? What are your test results?

 

i tested ecu grounds to the battery all tested 11.77 volts. and i get spark, i got the colors of wires and mine are all correct. i have checked the ecu pinning and they are all correct.

 

Grounds are typically tested for resistance or continuity to body ground. How did you use voltage to test all of the ECU ground wires?

If you want help, then provide detailed information. What color are the injector wires and where do they pin to the ECU?

 

i re checked them. resistance is 0 on all the grounds. and the colors are 1 brown 2 red 3 blue 4 yellow. all with a yellow black.

 

Describe exactly how you did these resistance tests.

Where do these wires pin to the ECU?

 

volt meter one in to each spot you said in the harness. other directly to battery ground. read 0 ohms


connector 1
injector 1. pin 1
injector 2. pin 3
injector 3. pin 5
injector 4. pin 2

 

0 Ohms is an unusually low reading. What Ohm scale was your multimeter set on? What Ohm reading do you get if you use the frame under the dash as ground in these tests?

 

not positive. i will check tomorrow.

 

so i took my fuel rail out and the injectors all fire at once right after i crank it.

 

Which one of the injector wires goes to the ecu? and where does the other wire go? and which goes on what side?