LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

What is the black wire for near starter?

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Old Mar 31, 2007 | 07:26 PM
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What is the black wire for near starter?

Hey guys,

My car is a 1997 Z28. I have been having issues with it running too rich and backfiring out exhaust - so I figured I would change the plugs.

While changing the rear plugs on passenger side - I noticed a black wire dangling around that came out of a large group of wires near the starter. It has an eye hook on the end, but was not connected to anything. It looks to me to be a ground wire of some sort - but I'm really not sure.

A friend of mine told me that he thinks its a ground wire - and that it may have something to do with the ignition or coil. I was thinking this wire not being grounded could be the cause of me running excessively rich. Just wanted to see if you guys knew what this wire is...

thanx in advance ....
Old Mar 31, 2007 | 07:31 PM
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it grounds many things like the pcm, maf sensor, fuel pump relay so you might wanna fix that. it grounds on a bolt and nut off the oil pan but can be grounded anywhere

Its at the bottom a little left of the middle.

LINK

Last edited by Critter; Mar 31, 2007 at 07:35 PM.
Old Mar 31, 2007 | 07:45 PM
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Wow!! Thanks for the responce - This could definitely be a major reason why I was running so rich. My spark plugs were fouling out after only a few hours of run time.

I would think that things such as the MAF sensor not being grounded would cuase fualty air/fuel readings and potentially cause the computer to dump in tons of un-needed fuel - which was cuasing me these problems.

Tommorow I will make sure that wire gets to a ground source

I can't believe the car even ran at all with that wire off!
Old Mar 31, 2007 | 09:57 PM
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That grounds to a stud on the motor mount, IIRC.
Old Mar 31, 2007 | 10:07 PM
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Originally Posted by seawolf06
That grounds to a stud on the motor mount, IIRC.
Theres one that grounds to a bolt on the oil pan as well. The one that grounds to the oil pan bolt is significantly smaller and would not fit on the motor mount stud.
Old Mar 31, 2007 | 10:10 PM
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actually, IIRC, it grounds to the block, near the mount

let me find the pic of it

ETA

here it is

Last edited by Dave89IROC; Mar 31, 2007 at 10:13 PM.
Old Mar 31, 2007 | 10:12 PM
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Originally Posted by Dave89IROC
actually, IIRC, it grounds to the block, near the mount

let me find the pic of it
You are thinking of a different ground http://shbox.com/1/battery_cable_ground.jpg thats what you are thinking of

He updated his post, weird shoebox's is in a different place from mine.

Last edited by LiENUS; Mar 31, 2007 at 10:15 PM.
Old Mar 31, 2007 | 10:13 PM
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Originally Posted by LiENUS
You are thinking of a different ground http://shbox.com/1/battery_cable_ground.jpg thats what you are thinking of
Exactly, he said it came from the starter.
Old Mar 31, 2007 | 10:23 PM
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Originally Posted by seawolf06
Exactly, he said it came from the starter.
umm..., I posted a pic of the ground he is talking about, you guys are linking to different ones...........

an remember, the starter and mount are only about 4 inches apart..............

look at the damn pic, jeez.....
Old Mar 31, 2007 | 10:25 PM
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it doesn't matter it just needs to be grounded!
Old Apr 1, 2007 | 08:11 AM
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I believe it is the ground from the earlier pic posted. This wire looks smaller than the one in the later pic posted - plus this wire is very close to that bracket that it shows it being mounted on in the earlier pic.

My only question is - isn't that bracket it shows it being grounded to an aluminum bracket? If so - how would that work?/ It needs to be grounded to metal. So I'm thinking I will be better off grounding it to the engine block or the oil pan or something....

and thanx for all the reply's guys - you have been a great help!!
Old Apr 1, 2007 | 08:21 AM
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Originally Posted by CrazyLT1
I believe it is the ground from the earlier pic posted. This wire looks smaller than the one in the later pic posted - plus this wire is very close to that bracket that it shows it being mounted on in the earlier pic.

My only question is - isn't that bracket it shows it being grounded to an aluminum bracket? If so - how would that work?/ It needs to be grounded to metal. So I'm thinking I will be better off grounding it to the engine block or the oil pan or something....

and thanx for all the reply's guys - you have been a great help!!
huh?

can you quote the pic you are referancing?
Old Apr 1, 2007 | 08:26 AM
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The pic that you posted - where the wire is grounded between 2 bolts on that long bracket on the engine block
Old Apr 1, 2007 | 08:28 AM
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Originally Posted by CrazyLT1
The pic that you posted - where the wire is grounded between 2 bolts on that long bracket on the engine block
its actually attached to a stud that screws right to the block

the stud holds the plug wire bracket, and the ground is on the nut
Old Apr 1, 2007 | 08:30 AM
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so it really grounds through the 2 nuts and down the stud to the block....

cool



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