LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Which Ground wire is this?

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Old 04-28-2008, 12:39 PM
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Default Which Ground wire is this?

The ground wire thats connected to the stud in the side of block on the passenger side. Its a thin wire next to the dipstick
Old 04-28-2008, 02:22 PM
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Do you mean this one?

Courtesy of Shbox:

http://shbox.com/1/g103.jpg

If so then this is the ground for the PCM.
Old 04-28-2008, 02:30 PM
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Originally Posted by DAVE00
Do you mean this one?

Courtesy of Shbox:

http://shbox.com/1/g103.jpg

If so then this is the ground for the PCM.
yeah thats it! I broke it a while back and tried to fix it best I could My car wont start now could this be why it wont start?
Old 04-28-2008, 02:31 PM
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Originally Posted by yardd0g24
yeah thats it! I broke it a while back and tried to fix it best I could My car wont start now could this be why it wont start?
Yup, your PCM or computer is not grounded, get it fixed and it should work fine. Let us know if it works.
Old 04-28-2008, 02:39 PM
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Originally Posted by DAVE00
Yup, your PCM or computer is not grounded, get it fixed and it should work fine. Let us know if it works.
well I been having problems with it lately no fire it would crank but wouldnt start! I've changed every single ignition piece there is and nothing so I hope I really hope this works!
Old 04-28-2008, 03:13 PM
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Originally Posted by yardd0g24
well I been having problems with it lately no fire it would crank but wouldnt start! I've changed every single ignition piece there is and nothing so I hope I really hope this works!
And be sure to fix the problem correctly. Get some 18 gauge wire, maybe about
6-10" worth, whatever is required to give the wire more "play" (i.e extra length).
I found that that ground wire on my car was just too short if you need to get your
hands in that space. Slide one end of the new wire into a ring-tongue terminal
and *solder* the wire to the terminal.

(Example of ring tongue terminal)
http://www.jameco.com/webapp/wcs/sto...oductId=302691

Get some shrink-wrap and slide it on the wire. Next, take the new section of wire
and twist it to the existing-wire's end (expose some or the original wire) and then
*solder* the two wires together - dont use those crimp couplers! After the wires
and solder have cooled down, slide the shrink wrap over the and shrink it.

Connect the terminal to the block ground post.
Old 04-28-2008, 04:08 PM
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Well would this prolly be my problem? I mean the car will crank and crank and it will pop out of the exhaust but will not start at all! I doubt this is the problem but i will fix it and see
Old 04-28-2008, 05:12 PM
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Quit postin and Fix it.. it should have been done by now..lol J/p.

Wierd that it's grounded down there..I never thought about that.
I had to make a ground for the LSX PCM when I did the Swap. I used one of the Green AC Wires on the Connector on the Wheel Well and made a Ground out of that going to where a few bolt up to right behind the Fuseable Links on the Passenger Side.
Old 04-28-2008, 05:18 PM
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Originally Posted by the_merv
Quit postin and Fix it.. it should have been done by now..lol J/p.

Wierd that it's grounded down there..I never thought about that.
I had to make a ground for the LSX PCM when I did the Swap. I used one of the Green AC Wires on the Connector on the Wheel Well and made a Ground out of that going to where a few bolt up to right behind the Fuseable Links on the Passenger Side.
hmm well I fixed it but no luck! I have no idea what it could be with this damn car! It ran alright with a miss until it died on the interstate and ever since then it hasn't started once! Unless its out of time thats the only thing i can really think of now
Old 04-28-2008, 06:13 PM
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Are you getting spark and fuel? If you're getting spark but no injector pulse (but have good psi) then check the TPS voltage, if its pegged at 5ish volts then it wont pulse the injectors, easiest way to do it is to unplug it and see if that works. But first you need to check whether you're getting good spark, fuel pressure, and injector pulse. If you're getting none of that it could be the opti being that the low resolution signal is used for firing the injectors as well, if im not mistaken
Old 04-28-2008, 08:18 PM
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Check your ground to the ICM and double check your connectors there for looseness and corrosion. It took me almost three months of troubleshooting mine to find out that was my problem.
Old 04-29-2008, 07:03 AM
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Originally Posted by yardd0g24
hmm well I fixed it but no luck! I have no idea what it could be with this damn car! It ran alright with a miss until it died on the interstate and ever since then it hasn't started once! Unless its out of time thats the only thing i can really think of now
Check for spark, it's probably the opti, more than likely.
Old 04-29-2008, 10:48 AM
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Originally Posted by SS#502
Check your ground to the ICM and double check your connectors there for looseness and corrosion. It took me almost three months of troubleshooting mine to find out that was my problem.
Are you talking about the three wires grounded to the Bracket for the coil? The opti on it has 0 miles on it. Put it on and would not run.
Old 04-29-2008, 10:53 AM
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Mine had a ground issue that made it start hard. One of the wires on the head was corroded.
Old 04-29-2008, 11:21 AM
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if you put the opti on and it wont run are you sure you didnt damage any of the opti harness??? sometimes the harness its self will go bad.
Old 04-29-2008, 12:39 PM
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Originally Posted by 355z28
if you put the opti on and it wont run are you sure you didnt damage any of the opti harness??? sometimes the harness its self will go bad.
thats a possibility..... I hope I didn't because that would be a pain in the *** to fix
Old 04-29-2008, 02:19 PM
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Or maybe you put the opti on wrong, check to make sure you have spark before you go any further. Check at the coil first, then work from there.
Old 04-29-2008, 02:27 PM
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Originally Posted by wannabess
Or maybe you put the opti on wrong, check to make sure you have spark before you go any further. Check at the coil first, then work from there.
The coil has spark..... i haven't checked at the plug yet... I need to do that tonight when I get off work. So I take it if theres no spark at the plugs there has to be something wrong with my brand new opti. Its on right I made sure i put it on right im 100% sure its on right
Old 04-29-2008, 07:10 PM
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well I checked and I have no spark to the plug at all! I guess the opti is trash and I ust got it! well back to the drawing board
Old 04-29-2008, 07:33 PM
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Originally Posted by yardd0g24
well I checked and I have no spark to the plug at all! I guess the opti is trash and I ust got it! well back to the drawing board
did you check to see if you had spark at the coil?


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