hi, My civic 97 ex obd1 p28, sometimes injector 3 stop working. If I turn the car on/off a few times start working again.

Whit this symptom what I have to check?

 

Have you swapped the injector to see if it still occurs?

 

Yes sir, 2 to 3 and still fail in the 3. Sound like Subaru...

 

Why are you using an OBD1 ECU?

 

LS VTEC Turbo
crome pro / tuned

Also tried another set of injectors and chip.

 

I hate when people decide what info they want to give and expect people to be able to figure things out. Sounds like something is lose/not make solid contact. Good luck to you.

 

sorry, for the info. I completely forget it at first.

The ECU send the ground signal, but there's any ground to be checked for injection system malfunction?

 

Have you check out your main relay? see if the yellow black wire is giving a constant 12v, do check you icm as well ecu pinout a21 and a 22 12v if no wire is loose. and check your fuel pressure if its not under pressure , might be the injector socket. or injector pinout in a5 Good Luck

 

Main relay is new.

Yel/Blk wire 12v constant ONII

ICM test during today, report later.

 

back proving A21, when wiggle the harness the voltage drop and the car miss or die.

This can be the source of the miss when idle alone?

 

Fix it and find out.