I recently spent 12 hours troubleshooting my car because cyl 1 would not fire (injector). It sporadically came back a few hours later and I drove my car to work assuming the best. Later in the day, I managed to limp the car over to Church Automotive and there I determined that cyl 1 was now working, but cyl 3 was now dead.
Here's what was done:
- swapped back stock injector clips and stock injectors
- rewired my map (since it had been spliced for my 3 bar)
Car ran fine before I did this wiring job.
Well, after troubleshooting this a bit, we determined the cyl had decent compression, fuel (the plug was drenched in fuel from the numerous starts), and spark.
I decided I had to leave my car @ church and have daniel look at it the next day. Determined w/ the shop's ECU that my ECU died out and cyl 3 would not fire (Even though the injector had 14v going to it-- known working injector mind you)
I am now in the process of spending 1000 to get someone elses PRB KPRO'd ecu.
What makes the ECU "lose a cylinder"?
I am looking to repair my KPRO and have the daughterboard swapped into a donor PRB ecu. $150 in labor im told.
**Noted, I had performed a compression test about 1.5 months prior to this happening and noticed 170-170-160-170. I'm wondering if it's a coincidence or this is an ECU related mishap?
What causes an ECU to die?
If an ECU injector output does not work, or works intermittently, then it means that the injector output transistor has been damaged.
In almost every case this is caused by a wiring short when swapping over the injector clips - it only takes the two wires to touch once which the ECU is on and the transistor will be damaged. The rest of the failures are caused by low impedance injectors or injectors coils shorting out.
One trick is to always cut the injector wires to difference lengths so that the soldered connections cannot possibly touch if the insulation fails.
In almost every case this is caused by a wiring short when swapping over the injector clips - it only takes the two wires to touch once which the ECU is on and the transistor will be damaged. The rest of the failures are caused by low impedance injectors or injectors coils shorting out.
One trick is to always cut the injector wires to difference lengths so that the soldered connections cannot possibly touch if the insulation fails.
Hondata
Thanks for your reply.
That's strange... im almost 100% positive I did not have the car on while sodering the connections or at any other time until after the installation.
I wonder if it could be the injectors? I did buy them used. what's the best way to check the impedance? They do look like stock RSX injectors (and use the same plug...) do any other cars use the same injector clips?
That's strange... im almost 100% positive I did not have the car on while sodering the connections or at any other time until after the installation.
I wonder if it could be the injectors? I did buy them used. what's the best way to check the impedance? They do look like stock RSX injectors (and use the same plug...) do any other cars use the same injector clips?