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Topic Review (Newest First)
01-21-2015 07:09 AM
matts88yj
LS Engine Sending Unit Install Guide

Not sure if anyone has come across this but I figured this would be a good starter guide for people wanting to know where to install certain sending units on their LS based motors and some other options shown along the way. This is by no means an end all, be all guide but it should get people pointed in the right direction.

http://www.autometer.com/media/2650-1563.pdf
01-20-2015 06:26 PM
Ocdjeep I just finished wiring my 5.3 from a Silverado, into my '94 yj,,, and put the pcm in a S-10 holder and mounted it right where the jeep eng. computer was.

no shortening of any GM wires, (PCM wires still exit drivers side)and the necessary coil/injector wires run straight back to the large jeep harness at the firewall.
pix in the am
01-14-2015 03:26 PM
chris demartini
Quote:
Originally Posted by waynehartwig View Post
Don't do that... Every single wire will be become a potential failure point.

If you REALLY want to shorten it, simply take the tape off part of the harness trunk and double it, then tape it back up.
I've seen guys re-pin every circuit at the PCM connector, mostly to straighten out truck harnesses that exit the engine to the side, and make them exit to the back. Awfully time consuming but the results are worth the effort.
01-14-2015 02:08 PM
jeepcj578
Quote:
Originally Posted by waynehartwig View Post
Don't do that... Every single wire will be become a potential failure point.

If you REALLY want to shorten it, simply take the tape off part of the harness trunk and double it, then tape it back up.
That sounds good to me, thanks Wayne.
01-14-2015 01:29 PM
waynehartwig
Quote:
Originally Posted by jeepcj578 View Post
I have looked around and found no specific answer on the whole harness. I want to shorten my harness about a foot so it fits and lays in the engine bay and looks more fact. I found a post from whane about 2 yrs old specific to o2 sensors on useing butt connectors, but wanted to know if I can just solder the rest and use some heatshrink?
Don't do that... Every single wire will be become a potential failure point.

If you REALLY want to shorten it, simply take the tape off part of the harness trunk and double it, then tape it back up.
01-14-2015 12:58 PM
jeepcj578 I have looked around and found no specific answer on the whole harness. I want to shorten my harness about a foot so it fits and lays in the engine bay and looks more fact. I found a post from whane about 2 yrs old specific to o2 sensors on useing butt connectors, but wanted to know if I can just solder the rest and use some heatshrink?
01-13-2015 05:22 PM
frylock looking to see what clutchs you guys are running with a lsX/nv4500 setup. doing a swap and wanted to know what best bang for buck
01-12-2015 06:35 PM
Lockedup-XJ Hey guys thought i would share some pics of my current vortec swap, 85' CJ7, 2003 4.8 out of a tahoe, factory passenger side manifold and vette driver side. PCM tuned by wayne.




01-12-2015 10:23 AM
waynehartwig
Quote:
Originally Posted by RebelRider View Post
Ok thanks. The stat I have now is opening just before the water boils in the pot (testing on Coleman stove). I know antifreeze and pressure will change that some.

The big issue is the motor is running for a few minutes getting up to temperature, but the water at th t-stat isn't getting hot enough to open it.
Air pocket? Radiator plumbed wrong? Bad water pump?
01-12-2015 09:58 AM
RebelRider
Quote:
Originally Posted by waynehartwig View Post
Someone beat me to it!

The stock tstat is perfect. leave it. If you are having over temp issues, most likely the tstat is bad. Take it out and test it. Also test the new one before you even put it in. They can be bad out of the box. Put a bad one in, and you are chasing your tail on an issue that you created.
Ok thanks. The stat I have now is opening just before the water boils in the pot (testing on Coleman stove). I know antifreeze and pressure will change that some.

The big issue is the motor is running for a few minutes getting up to temperature, but the water at th t-stat isn't getting hot enough to open it.
01-12-2015 09:54 AM
matts88yj
Quote:
Originally Posted by waynehartwig View Post
Someone beat me to it!

The stock tstat is perfect. leave it. If you are having over temp issues, most likely the tstat is bad. Take it out and test it. Also test the new one before you even put it in. They can be bad out of the box. Put a bad one in, and you are chasing your tail on an issue that you created.
X2. You can also have them failing open out of the box after a few heat cycles. Happened to me last week after that thermostat has only been in for roughly a year.
01-12-2015 09:46 AM
waynehartwig
Quote:
Originally Posted by RebelRider View Post
Has anyone swapped in a 160 degree thermostat without a re-tune? Experience any codes? Running issues?
Quote:
Originally Posted by chris demartini View Post
These engines are designed to run 200-220 from the factory. You're wasting fuel, power and 02 sensors running them that cold.
Someone beat me to it!

The stock tstat is perfect. leave it. If you are having over temp issues, most likely the tstat is bad. Take it out and test it. Also test the new one before you even put it in. They can be bad out of the box. Put a bad one in, and you are chasing your tail on an issue that you created.
01-12-2015 06:11 AM
RebelRider
Quote:
Originally Posted by Why J? View Post
Stock is 195. My rig was seeing 220+ crawling at slow speeds on the trail and at highway. Never overheated. I just wasnt comfortable with it. The 180 keeps it below 190 all the time.

I wouldn't go with a 160, that is just too cold for these engines.
Quote:
Originally Posted by chris demartini View Post
These engines are designed to run 200-220 from the factory. You're wasting fuel, power and 02 sensors running them that cold.
Thats what I needed to know. Thanks
01-12-2015 06:07 AM
chris demartini These engines are designed to run 200-220 from the factory. You're wasting fuel, power and 02 sensors running them that cold.
01-11-2015 10:25 PM
Why J?
Quote:
Originally Posted by RebelRider View Post
I'm not looking for performance nor fuel economy out of it. This is a trail only truck. Isn't the OEM 187?
Stock is 195. My rig was seeing 220+ crawling at slow speeds on the trail and at highway. Never overheated. I just wasnt comfortable with it. The 180 keeps it below 190 all the time.

I wouldn't go with a 160, that is just too cold for these engines.
01-11-2015 05:58 PM
RebelRider
Quote:
Originally Posted by HankScorpi0 View Post
Can't fix stupid
Wow. Go tell your buddies how you punked someone out on the internet. I'll know better next time.
01-11-2015 05:56 PM
RebelRider
Quote:
Originally Posted by HankScorpi0 View Post
Then what's the point of asking? Are you just looking to look like an idiot? Yes you can use it but after doing a tune it will cost you unnecessary money. Got it?
I'm asking because I'm wondering if it will help it keep the temps down at low speeds. Since the computer is looking for an set temp to run at efficiently, I may run into rich/lean problems. When I say "tune" I mean setting the computers operating temps different (if even possible).
01-11-2015 05:54 PM
HankScorpi0
Quote:
Originally Posted by RebelRider View Post
Seriously? Fuck off. Your trying too hard to look like a badass. Luckily this long thread has been doing great without people like you screwing it up. Move along....
Can't fix stupid
01-11-2015 05:46 PM
RebelRider
Quote:
Originally Posted by HankScorpi0 View Post
Then what's the point of asking? Are you just looking to look like an idiot? Yes you can use it but after doing a tune it will cost you unnecessary money. Got it?
Seriously? Fuck off. Your trying too hard to look like a badass. Luckily this long thread has been doing great without people like you screwing it up. Move along....
01-11-2015 05:41 PM
HankScorpi0
Quote:
Originally Posted by RebelRider View Post
I'm not looking for performance nor fuel economy out of it. This is a trail only truck. Isn't the OEM 187?
Then what's the point of asking? Are you just looking to look like an idiot? Yes you can use it but after doing a tune it will cost you unnecessary money. Got it?
01-11-2015 04:58 PM
RebelRider
Quote:
Originally Posted by Why J? View Post
I put in a 180 degree thermo this summer. It runs a little cooler and gets worse gas milage but no improvement in performance.
I'm not looking for performance nor fuel economy out of it. This is a trail only truck. Isn't the OEM 187?
01-11-2015 04:55 PM
Why J? I put in a 180 degree thermo this summer. It runs a little cooler and gets worse gas milage but no improvement in performance.
01-11-2015 03:59 PM
RebelRider
Quote:
Originally Posted by HankScorpi0 View Post
You might want to get a throttle body spacer to go with that stat.
I already have 2 spacers bolted together.
01-11-2015 03:57 PM
HankScorpi0
Quote:
Originally Posted by RebelRider View Post
There really isn't a reason. I need to replace mine, and I already a new 160 for my DD that I never have used.
It doesn't run any better with a 160 stat the temp the motor runs at is optimal for burning fuel and fuel economy. You might want to get a throttle body spacer to go with that stat.
01-11-2015 03:54 PM
RebelRider
Quote:
Originally Posted by HankScorpi0 View Post
Its not an old school 350 the stock stat works great no reason to run 160 IMO
There really isn't a reason. I need to replace mine, and I already have a new 160 for my DD that I never have used.
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