Electrical HACK to run your LS on the Stand!!
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- เผยแพร่เมื่อ 7 ก.ย. 2024
- Showing how to wire a gen 3 ls engine to run anywhere. On a stand, in the floor, in a box, wherever, as long as you can supply fuel and power, it will run. Much simpler than most people think. Also, re-covering the process to remove VATS using HPTuners and showing how to change injector flow rates.
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Hey man this video is exactly what I needed for my build! Just one question. In your video, when you’ve consolidated all of the wires into 3 basic cables, I see a computer on the table in the background. Will that computer hinder a start up if I don’t have it?
Thanks for the help and the awesome video!
I used the computer to remove de-activate VATS in the PCM. These engines won't run by themselves out of the vehicle unless the VATS programming in the pcm is turned off.
Thank you so much for this , all a fellow youtuber and blonde mohawk haver I gotta say I enjoyed this . Sub well earned .
Thank you! Appreciate the Sub!!!
That was awesome, congrats man…
Thanks!
Excellent info, again! Pretty freaky seeing it run on the stand though lol.
It is weird, we're so accustomed to only seeing engines run in a vehicle with all the "supporting systems" seeing them run without is weird.
Good stuff. I’m getting ready to do a test start on my LS also. I am trying to find out the type of cam I have in it. The engine shop I bought it from said it had a BTR cam installed as they we’re going to use the engine for a drag car, but decided to go with a big block instead. I’m waiting on a response from the shop.
Yeah either specs from the shop or pull the rear cover and get the part number off the back of the cam. BTR has TONS of cams so it could be anything. Good luck!!
Appreciate the tips and tricks giving me the motivation to go out here and try to attempt this keep it coming 🙏 👀 🍿
heck yeah, get after it!
Super helpful! Thanks!!!
Glad it was helpful!
Just finish building a lq4, I'm trying to do the same thing with a ebay stand alone, but fuel pump isn't kicking on. Hopefully I can get it to work today.
Hope you figure it out!
Nice job! Thanks
Thank you!
I have a similar engine ls3, I did the electrics as you have in the video. We programmed the computer and turned off the "vats system". Unfortunately, the engine did not start. High voltage comes to the spark plugs, but no impulse comes to the injectors. Maybe you can advise me what could be the reason. Diagnostics shows me the error P0315. The sensor is working. Thank you very much in advance
If it has spark but the injectors aren't pulsing, first I would make sure they have a good 12V+ supply, then I would triple check that all the grounds in the harness are connected to the engine block on a good clean surface. If all that checks out and you still don't have injector pulse I would log the pcm inputs and make sure it has good cam and crank position signals. Double check also that when you removed VATS you did a WRITE ENTIRE because it won't actually remove vats any other way.
@@MohawkMotors Many thanks for the feedback and comments. I live in another country "Asia in Georgia". Watts was deleted in America and I don't know exactly how they did it. I will write a letter and see what they say.
@@MohawkMotors Hello, I saw your message late. I started the engine. I checked everything before and everything was fine. The only reason why it did not work was the starter relay, it did not turn on and the computer perceived it as an error, it did not allow the engine to start.
@@4l1dm Glad you got it figured out!
Hello. If you can draw me a diagram of how the starter relay turns on. One wire comes out of the computer "starting charging system". Thank you very much in advance
The starter relay is very simple. The control side and load side are fed battery 12V +. The other terminal of the control side is run to the pcm, when you turn the key to the start position, the pcm grounds the control side and completes the circuit, which closes the load side of the relay. The other terminal of the load side of the relay is connected to the exciter post on the starter. SO, when you turn the key to the start position, the pcm provides ground to the control side of the starter relay, that activates the relay and closes the load side of the relay, which allows battery 12V+ to flow to the exciter post on the starter, which activates the starter and cranks the engine.
@@MohawkMotors Hello. thank you for advice. I want to tell you that I do not have a key block, nor a comfort block. I only have the engine and gearbox wiring. The starter wire comes out of the computer, but no action can come out of it, because the comfort unit and key are not connected. I am forced to put one relay in this circuit to false and put another second relay with a simple connection, which will work the starter.
So essentially your making a stand alone harness out of the original harness correct?
That is correct!
How did you connect obd2 plug to computer to hp tuner to turn off vats
I have a bench harness that I use, can also put it into a compatible year truck and just connect through the truck obd2 port.
great info!!
Glad it was helpful! Thanks for watching!
My harness never came with a fuse block it came just as yours is with the black block only. Could i do what youve done here but have the power circuit manually turned on and off with a switch (as the fuel pump will be) and run this as a long term in the car solution?
Yes, you could do it that way. I would highly recommend a fuse of some kind in the system as a safety but you could absolutely control it with a simple on off switch. (A relay would be a good idea, too much amperage going through the circuit for a switch to last very long)
@@MohawkMotors okay thank you very much! I don't know anything really about electrical stuff but I'm learning. Was tempted to buy a cheap standalone Amazon harness but I have the original one so might as well use jtn
I have a 6.2 engine. So I tried and it didn’t work out. I am told that I need an immobilizer. Please tell me if you need an immobilizer?????
I'm not sure about an immobilizer, but you will need to remove the anti theft (VATS) from the computer. Did you do that?
How do you remove the vats from the computer
How did you connect the fuel pump? Thanks for the video 🔥🔥🔥
I made a portable fuel sending unit, it's a 5 gallon bucket with a fuel sending unit out of a truck I parted out, just connect the feed to the feed and return back to the bucked and give the pump 12V and a ground.
@@MohawkMotors ok thank you!!!
Can this be done in the veichle
yes you could do this in the vehicle as well, the gen 3 Ls engines are actually quite easy to bypass in the vehicle
@@MohawkMotors thank you i had someone do n ls swap for me cut up all my wiring so now im thinking this is the way to go thank you got a new subscriber
I appreciate the subscription!
How do I get this program so I can do my own I am a beginner
HP Tuners? You can buy it from tons of places. Jegs, Summit, Amazon, directly from them, etc. Just google shopping search for it.
how did u crank it on at the end ? u just give the starter 12v ??
Yeah, just 12v to the starter exciter post.
Just ls swapped my 03 Chevy Silverado it was a v6 it runs and drives but wont shut off when i turn the key off and wont charge what do u think it could be
What year engine, harness, and computer did you swap into it?
@@MohawkMotors 04
@@MohawkMotors. It's a 01 motor with a 04 harness and computer do u have any idea wat I should do get another harness or fix what I got
If you're using and 04 harness and computer in an 03 truck, it should work. If you didn't modify the harness in any way then you may just have a bad connection somewhere. Also did you convert the 01 motor to drive by wire to work with the 04 harness and computer or are you using a van harness and computer to run the 01 engine as drive by cable?
@@MohawkMotors yes I changed it to drive by wire my harness was cut in half when I got it and I got it wired to what I thought was right and it runs but doesn't shut off at the key u shut the lights off after the key is on truck still run shut the lights off and the truck shuts off I didn't know if u would have like any idea on the wire color or a video something I could look at to correct what I did wrong
did u have a pedal hooked up when running it? i have vats turned off on my pcm, i didnt select write entire when i did it though. but it will fire and run for half a second then shut off
was wondering if ecm not receiving a pedal input was shutting it off
In order to remove VATS you need to do a Write Entire, Write Calibration will not disable VATS.
This the same for a ls1 5.7? Or is ls1 different wiring?
LS1 is extremely similar, harness is laid out a little differently but the same system is used.
Hi why did you change injector fuel rate?
I plan to turbo charge the engine so it will need more fuel
Man I tried everything and my swap still won't start its crazy I think the person I had deleted vats never did it
I have heard of a LOT of people doing that. If they don't do "Write Entire" it won't delete Vats
@@MohawkMotors o ok
Did everything the video said when I put power to it engine doesn’t make the noise yours did
What did it do? Did it crank over? Did it sputter? Did it do nothing at all? I'll try to help, what happened when you tried to start it?
@Mohawk Motors I got the engine to make sum noise but still doesn’t fire just got my vats deleted an still nothing
No injector pulse or spark from coil but I have power going to the coils and injectors
Do you have hp tuners or a scan tool that will allow you to live view the pcm inputs? No injector pulse and no spark when you have goo power and ground supplied would make me think you aren't getting crank position signal to the pcm, it's the only other ingredient the pcm needs to fire the injectors and trigger spark.
@@MohawkMotors I have spark now but still no injectior pulse
Fk.. yeah 👍💯🎉
Thanks!
Why not use the factory fuse block first?!
I wanted this video to be for demonstration of how to run an engine out of a vehicle for people. A lot of times someone buys an engine and it doesn't come with the fuse block, or even the fuse block connector, just a chopped off harness, I was hoping for this to help by not relying on those being there.
My engine doesn't wanna stay on
Is VATS disabled in the computer?
Why is computer needed
The computer tells the injectors when to inject fuel, and when to ignite it with the spark plug.
@@MohawkMotors
Oh. On engines with carburetors, what tells the spark to ignite?
the distributor