98 PCM - Sudden Grounding Issue
07-25-2016, 04:53 PM
#1
98 PCM - Sudden Grounding Issue Hi Guys,
I am currently having my 98 Camaro tuned by a reputable tuner local to the greater Atlanta area. I brought the car to them last week and swapped out 28lb injectors in favor of 42lb injectors. I didn't start the car after installing the 42lb injectors as I didn't want to cause any trouble with incorrect fueling.
The day after dropping the car off the tuner calls me to tell me that the car will not run without the laptop OBD II harness attached to the OBD II port. When the tuner pulls the laptop OBD II harness out, the engine dies. The tuner chased it down to the PCM ground and has installed a jumper on the OBD II port in order to ground the PCM. The car runs fine with the jumper installed.
Here is my question: What went wrong? Did I cause the issue when installing the injectors? I was very kind to the injector harness and I have removed and installed the injectors a few times thru the years. Is there a critical ground in or near the injector harness? The tuner said he checked out all of the grounds throughout and they were all OK.
For what its worth, I've never had an electrical problem in the car. Ever.
Please share any thoughts you may have.
Thank you,
I am currently having my 98 Camaro tuned by a reputable tuner local to the greater Atlanta area. I brought the car to them last week and swapped out 28lb injectors in favor of 42lb injectors. I didn't start the car after installing the 42lb injectors as I didn't want to cause any trouble with incorrect fueling.
The day after dropping the car off the tuner calls me to tell me that the car will not run without the laptop OBD II harness attached to the OBD II port. When the tuner pulls the laptop OBD II harness out, the engine dies. The tuner chased it down to the PCM ground and has installed a jumper on the OBD II port in order to ground the PCM. The car runs fine with the jumper installed.
Here is my question: What went wrong? Did I cause the issue when installing the injectors? I was very kind to the injector harness and I have removed and installed the injectors a few times thru the years. Is there a critical ground in or near the injector harness? The tuner said he checked out all of the grounds throughout and they were all OK.
For what its worth, I've never had an electrical problem in the car. Ever.
Please share any thoughts you may have.
Thank you,
Last edited by 98cherrySS; 07-29-2016 at 10:42 PM.
07-28-2016, 03:21 PM
#3
The issue is in the harness. I have had this same problem twice.
Have them check and clean all grounds. There are 3 main grounding points in the engine harness, fixing those will get rid of most problems, but there are several grounds to check.
Have them check and clean all grounds. There are 3 main grounding points in the engine harness, fixing those will get rid of most problems, but there are several grounds to check.