Grounding my LS1
09-13-2008, 06:26 AM
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Grounding my LS1 I'm recently about to finish my 240sx LS1 swap which is taking me a lot of time due to the very limited amount of LS1's in my country...
Anyhow, the problem I'm facing now is grounding my ls1, can anyone point me in the right direction to where I can find a thread that specifically describes this process...
Anyhow, the problem I'm facing now is grounding my ls1, can anyone point me in the right direction to where I can find a thread that specifically describes this process...
09-13-2008, 09:45 AM
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Don't know of any threads, but run a ground wire from one of the holes on the back of the cyl head directly to the same place that you run the grounds for the PCM. It ties all the grounds together so there is no voltage drop.
09-13-2008, 10:15 AM
#3
For my swap I used more than the normal ground, but normally in a Stock Harness, there is two to three ground that are bolted to the back of the Head.
I have addional grounds on each side of the block to the frame, using the front engine mounts. And I use a ground from the back of the other head to the body.
I also use grounds at the battery, one each to the block, frame and body.
I have my PCM inside the cab, so for the PCM grounds, I used the same bold that grounds the head to the body as it goes though the firewall.
This maybe overkill, but it works for me, a few people have warned me about ground and causing problems with Stereo systems. But I responded, I only listen to the sweet music of the LS1 !.. who cares about the stereo. LOL !
my .02 cents on grounds.. and as they say, most elecrical problems are due to bad grounds...!
I have addional grounds on each side of the block to the frame, using the front engine mounts. And I use a ground from the back of the other head to the body.
I also use grounds at the battery, one each to the block, frame and body.
I have my PCM inside the cab, so for the PCM grounds, I used the same bold that grounds the head to the body as it goes though the firewall.
This maybe overkill, but it works for me, a few people have warned me about ground and causing problems with Stereo systems. But I responded, I only listen to the sweet music of the LS1 !.. who cares about the stereo. LOL !
my .02 cents on grounds.. and as they say, most elecrical problems are due to bad grounds...!
09-13-2008, 11:37 AM
#4
Do you mean the Grounds in the Harness, or on the Chassis?
I grounded the Harness to the Oil Dipstick Bolt, I moved all them wires internally in the Harness to that point.
As far as the Chassis, I have a Grounding Strap coming off each side of the Engine, one going to the Drivers side on the side of the Inner Body, and the other going to the passenger Strut Tower, I have a rear-mounted Battery.
I grounded the Harness to the Oil Dipstick Bolt, I moved all them wires internally in the Harness to that point.
As far as the Chassis, I have a Grounding Strap coming off each side of the Engine, one going to the Drivers side on the side of the Inner Body, and the other going to the passenger Strut Tower, I have a rear-mounted Battery.
09-14-2008, 08:26 AM
#6
The only ground on my motor is the battery cable going to a bolt on the back of the block. I was going to add some other small guage grounds, but this is working fine for my carb'd motor.
One think I did find out is the valve covers are electrically isolated from the rest of the motor. Don't hook anything to the valve covers that needs a good ground path. I can't remember if a multimeter check showed continuity between the heads and the block, but I do know for a fact the valve covers and coil pack bracket is open circuit to the block.
One think I did find out is the valve covers are electrically isolated from the rest of the motor. Don't hook anything to the valve covers that needs a good ground path. I can't remember if a multimeter check showed continuity between the heads and the block, but I do know for a fact the valve covers and coil pack bracket is open circuit to the block.
09-14-2008, 09:19 AM
#7
Ground issues are the number one head scratching pita confusion in any auto electrical problems due to the flaoting ground. Heres a link with a description and a pic of how I did mine. Two years and zero issues 
http://www.thirdgen.org/techboard/lt...ll-engine.html
http://www.thirdgen.org/techboard/lt...ll-engine.html
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09-14-2008, 08:50 PM
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Do you mean the Grounds in the Harness, or on the Chassis?
I grounded the Harness to the Oil Dipstick Bolt, I moved all them wires internally in the Harness to that point.
As far as the Chassis, I have a Grounding Strap coming off each side of the Engine, one going to the Drivers side on the side of the Inner Body, and the other going to the passenger Strut Tower, I have a rear-mounted Battery.
I grounded the Harness to the Oil Dipstick Bolt, I moved all them wires internally in the Harness to that point.
As far as the Chassis, I have a Grounding Strap coming off each side of the Engine, one going to the Drivers side on the side of the Inner Body, and the other going to the passenger Strut Tower, I have a rear-mounted Battery.
(okay this might help, my car is going to be a race car with no sound system, only a head unit and the stock speakers maybe...)
In Summary, I need to recheck my mechanics/electricians work on my car, by checking all the important critical points where my Harness, PCM, or Engine needs a ground...
I hope this makes it clear what I really want...
09-16-2008, 09:00 PM
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ok guys, if this isn't installed would it affect the idle of the car? its the first time I turn it on from a year, would it stabilize later?! And i suppose its necessary to install the IAT right?
09-16-2008, 09:16 PM
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http://www.youtube.com/watch?v=45SbkpG1zFg
This is how my engine is running now, don't mind the unplugged MAF, it dosn't change anything I tried plugging and unplugging...
This is how my engine is running now, don't mind the unplugged MAF, it dosn't change anything I tried plugging and unplugging...
09-17-2008, 05:41 PM
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ok I did install the IAT, and made a custom exhaust... but unfortunately some weird sound was heard inside my engine... something like a bolt or I don't know what inside the engine... we shot the engine down immediatly... and are trying to find out what that was... I never heard that b4, but could be due to the loud sound without the exhaust b4... anyhow we''re rechecking.. wish me luck 
09-18-2008, 05:18 PM
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Ok what actually turned out is that I don't have EITHER the CAM SENSOR, nor the MAP SENSOR installed... I didn't see them before due to the stack of wires above them and the way my engine is positioned under the firewall ... (im surprised it actually turned on...)
... (im surprised it actually turned on...)
09-19-2008, 12:47 PM
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Ok I found the Cam sensor connector, and I plugged it in, but I didn't turn the car on, im still in the search of a MAP sensor which is broken... I also bought AC Delco Iridium SparkPlugs...