Tuning guys check this out!
10-06-2013, 04:20 PM
#1
Tuning guys check this out! I recently upgraded my injectors from the stock injectors to Bosch 42# green giant injectors and had the car retuned. I drove the car for about a day and a half and the car developed a miss on cylinder #6. The injector on that cylinder went bad so I contacted the person I bought the injectors from and he sent me a new one. I replaced the bad injector and drove the car yesterday. It ran on all 8 cylinders for the day and started missing again. I felt the header tubes and #6 was cold. I switched injectors and the miss followed that injector. Why would I be having problems with the injectors going bad on #6. The tuner is blaming the injectors but I can't understand why its the same cylinder?
10-06-2013, 06:44 PM
#3
I pulled the fuel pump fuse and turned the engine over with just the injector plugged in on number 6. You can feel the good injector pulsing. If I plug one of the bad ones in I feel nothing. I also tested the plug with a multi tester and the voltage is pulsing. Its definitely the injector but why did 2 injectors go bad on the same cylinder? Something is killing these injectors. They worked for a short period of time when I first installed them.
10-06-2013, 08:04 PM
#6
Hmmm well lets think about this for a min.....the injectors have 12volt power to them all the time and the PCM controls the ground side to turn them off and on. I'd say its a dam good chance you have a ground problem. I'd check the grd wire back to the PCM carefully. Beyond that you may need to replace the PCM. It maybe be failing causing that injector circuit to stay on killing the injector over a short period of time.
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10-06-2013, 09:05 PM
#8
Hmmm well lets think about this for a min.....the injectors have 12volt power to them all the time and the PCM controls the ground side to turn them off and on. I'd say its a dam good chance you have a ground problem. I'd check the grd wire back to the PCM carefully. Beyond that you may need to replace the PCM. It maybe be failing causing that injector circuit to stay on killing the injector over a short period of time.
10-06-2013, 10:04 PM
#9
Put one of the good injectors from a differant cylinder in #6 and see if it goes bad. If the wire in the harness going back to the pcm gets grounded it will leave the injector on and burn it up
10-07-2013, 06:38 PM
#12
Mike, its the factory PCM that came in my 01 Camaro ss. Do you know if each injector is controlled by separate injector drivers in the pcm or is there one driver that controls all injectors? If there is only one driver that would eliminate this being the problem. I'm only having problems on that cylinder. I checked the wires from the pcm to the injector plugs. There are no shorts.
10-07-2013, 06:42 PM
#13
I understand what you are saying but wouldn't that cylinder have flooded and ran real rich? My car idled okay and didn't seem like it was flooding. It had surging issues and the idle didn't come right down to 900 rpm's when I'd come to a stop but I just think that was the tune not being quite right.
10-08-2013, 05:04 AM
#14
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Yes it would have flooded and ran rich. How quick did you pull the plug and start diag? The plug might give an indication. But if it ran for a while might not tell. How about installing a noid light and let it idle to get pcm warmed up and see if signal goes solid on?
10-08-2013, 01:54 PM
#15
Mike, its the factory PCM that came in my 01 Camaro ss. Do you know if each injector is controlled by separate injector drivers in the pcm or is there one driver that controls all injectors? If there is only one driver that would eliminate this being the problem. I'm only having problems on that cylinder. I checked the wires from the pcm to the injector plugs. There are no shorts.
