Hello H-T.

I swapped my 1999 civic hatchback two years ago with a jdm ITR. I've been driving daily ever since with zero issues.
Well went to start it one morning, started great, idled normal for about 15 seconds then it started missing and eventually died.
Upon inspection, I found that #1 injector is staying wide open when the key turned on, dumping fuel into the cylinder and flooding it.
I have taken the engine harness out, deloomed it, inspected all the wiring and checked everything with a multi-meter, it checked out fine.
I replaced the injectors, new main relay, tried a known good ecu and a different distributor.
Nothing I've done has resolved the issue.
The only thing I haven't changed/checked is the dash harness and the two fuse boxes.
I do have a push button start wired up, not sure if that would cause an issue though if something with that messed up.

Does anyone have an idea of what could be my problem?

 

How exactly do you know the injector is sticking open ? Have you compression tested the engine ?

 

Cylinder 1 fills up with gas when priming the fuel pump.
Then when I unhook #1 injector plug it does not do it.

 

Replace the injector

 

 

Swap the injector into a different cylinder, and see if the problem stays in the same cylinder, or follows the injector.

 

He said new injectors.

OP, try disconnecting the ecu connector that supplies the first injector and test for continuity to ground on the ground side of the injector connector. Obviously there should be no continuity.

 

Keep in mind if the 1st cylinder isnt getting spark you could have what you think is a flood condition as well.

 

Tried a third set of fuel injectors. Still does it even with them unhooked. I have an AEM FPR, could that have malfunctioned causing this problem?

 

Ok so they're dumping fuel into the cylinders even when not connected? What's your current fuel pressure at? I'm not quiet sure if thats possible unless you have some crazy fuel pressure

 

If injector and ECU/ECM are good the problem can only be a short to ground on the injector control lead.

Unplug the injector and test the control lead, [lead that is a diff. color on each injector plug] for continuity to ground. 94