grrttwright

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!

Former User

What ECU and engine wire harness?

Linked

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

grrttwright

the injectors all get power.

Former User

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

grrttwright

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.

NotAJDMFanBoy

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.

Linked

what sensor controls fuel injection again? ckp or cam?

Former User

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.

grrttwright

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

Former User

Did you test them with a multimeter?

grrttwright

Yes. they are all good grounds.

Former User

Swap in a known good ECU.

grrttwright

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

Former User

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?

Former User

How do you know? What are your test results?

grrttwright

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.

Former User

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?

grrttwright

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.

Former User

Describe exactly how you did these resistance tests.

Where do these wires pin to the ECU?

grrttwright

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

Former User

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?

grrttwright

not positive. i will check tomorrow.

grrttwright

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

grrttwright

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