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Old 08-28-2012, 01:30 AM   #1 (permalink)
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EFI harness ground connection
Guys, do you know why it's important to connect ground wire first when installing EFI harness?
this is from installation instructions:
Remove the last bolt holding the lower intake down on the passenger side. Install #13 (should be #9 according to the picture) engine ground and torque the bolt back down to specifications. This
is extremely important and should be the first connections made!
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Old 08-28-2012, 11:13 AM   #2 (permalink)
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my guess is they're emphasising it because it's probably the most important connection in the harness, and because of it's location, easy to overlook. I don't see any reason why it would HAVE to be the first thing you connect.
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Old 08-28-2012, 12:36 PM   #3 (permalink)
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The first thing that came to mind was working on your home computer. Ground yourself to the chassis before removing boards to avoid static electricity that might cause a problem.

You ground the harness first before plugging it into the computer. Makes sense to me.

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Old 08-28-2012, 12:50 PM   #4 (permalink)
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Easy
This is so you dont forget. Pretty frustrating when after long months the car wont run and you cant remember or trace what you did not do. The computer itself is very robust. It will survive anything short of a bath in water or a bullet strike.
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Old 08-28-2012, 01:00 PM   #5 (permalink)
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Based on what you guys saying, I don't have to unplug 60pin connector from ECU, every time I disconnect ground from the battery, connect battery and only then connect 60pin connector back to the ECU.
Thank you,
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Old 08-28-2012, 01:02 PM   #6 (permalink)
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That wire could wiggle around and graze the engine while you're moving other wires to connect them, so it's probably a precaution to prevent it from shorting the computer if you have it plugged in.
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Old 08-28-2012, 04:29 PM   #7 (permalink)
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Quote:
Originally Posted by vlydeka View Post
Based on what you guys saying, I don't have to unplug 60pin connector from ECU, every time I disconnect ground from the battery, connect battery and only then connect 60pin connector back to the ECU.
Thank you,
Agreed - no need to do that. However I do remove the 60 pin connector when I need to weld on the chassis.
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