Notices
PCM Diagnostics & Tuning HP Tuners | Diablo | Pantera EFI

98 PCM - Sudden Grounding Issue

 
Old 07-25-2016, 04:53 PM
  #1  
TECH Regular
Thread Starter
iTrader: (2)
 
98cherrySS's Avatar
 
Join Date: Jun 2008
Posts: 492
Default 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,

Last edited by 98cherrySS; 07-29-2016 at 10:42 PM.
98cherrySS is offline  
Old 07-28-2016, 02:07 PM
  #2  
TECH Regular
Thread Starter
iTrader: (2)
 
98cherrySS's Avatar
 
Join Date: Jun 2008
Posts: 492
Default

Bump.
98cherrySS is offline  
Old 07-28-2016, 03:21 PM
  #3  
10 Second Club
iTrader: (3)
 
MontecarloDrag's Avatar
 
Join Date: Aug 2005
Posts: 885
Default

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.
MontecarloDrag is offline  
Old 07-29-2016, 07:30 AM
  #4  
TECH Regular
Thread Starter
iTrader: (2)
 
98cherrySS's Avatar
 
Join Date: Jun 2008
Posts: 492
Default

Originally Posted by MontecarloDrag View Post
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.
Thanks brother. I'll be walking thru this entire harness when I get the car back.
98cherrySS is offline  
Old 07-30-2016, 03:36 PM
  #5  
TECH Regular
Thread Starter
iTrader: (2)
 
98cherrySS's Avatar
 
Join Date: Jun 2008
Posts: 492
Default

Well, it was a broken ground on the back of the drivers head. $2 fix.
98cherrySS is offline  
 


Thread Tools
Search this Thread
Quick Reply: 98 PCM - Sudden Grounding Issue


About Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: