How to use a Holley EFI 58x Harness on 24x Engines
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- Опубликовано: 2 июл 2024
- Follow along as Tom shows us how to properly use a Holley EFI 58x harness on '05-'06 LS2 and other 24x engines. Tom also shows us how to setup the Holley EFI software so it all works.
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I have an LS2 from 2006 GTO with this 58x harness. Swapped pin A and C on the cam connector like the instructions on this vid indicates and engine didn't idle well. Changed pins back to the way the harness came and engine idles perfect...programed ECU to 24x both times.
Thanks for the how-to! I have a frankenstien L76 converted to 24x/1x and asked this same question on the Terminator X overview video.
If you’re putting this on a 05-06 GTO LS2, don’t swap anything. Run the 58x harness and the stock 24x crank sensor with the stock 1x cam sensor, and choose 24x in the start up wizard and it’ll work. I followed this video and trouble shot for days. Then when I swapped back it had messed the pins up and I didn’t know it, which led to more trouble shooting
JackTack nailed it. I'm running a 550-928 for the 58x LS2 on my 24x/1x LS2. I swapped the A/C pins and selected 24x in the dropdown just like this video said to do. It finally started but cylinders 3 and 4 weren't firing. After a day of troubleshooting, I flipped the pins back to stock and what do you know, runs great! The only mod I needed to do was to remove the tab so the crank sensor would plug in.
I got a 2015 gen 4 vvt engine that i converted to 5.3 24x crank and 3 bolt cam with 1x cam sprocket also I put an ac delco 24x crank sensor in and according to parts catalog the gen 4 cam sensor out of 2015 express 2500 is same as gto. Is this correct? Im having all sorts of backfire and hard start issues. I did swap the pins on cam sensor like video said right when i got my term x delivered. Wish i had seen these comments before. Gonna swap the pins back and see what happens. Any input appreciated.
Reporting back, yep swapped the wires back and it fires right up perfect AFRs! Sloppy cam+ 70mm turbo music to ears :)
A-Red wire
B-Black wire
C-Purp wire
Thanks guys yall are awesome!
This is only if you swap from 1x to 4x cam sensor. Not reluctor wheel? So if I switch from 24 to 58 no need to swap pins. Just cut tab out?
@@juandenny3198 also wondering this. I have a 4x cam setup now. But a stock 24x bottom end with a 58x harness and the cam is easy to figure out. But also curious if I can just run a 24x sensor cut the tab and set it up for a 24x in the terminator. Still not sure
Happy I found this video after getting multiple different suggestions from the Holly tech service line yesterday. The people I talked to on the phone need to learn from this guy about the GTO LS2. I was told to buy the 550-929 kit for LS1/LS6. One rep said my injectors will work while the other rep said I have to go buy injector adapters. Then after watching this video I have realized that my cam position cable AND knock sensors wouldn't have reached. The miss information and confusion I got yesterday was a little disappointing. Still not sure if my GTO throttle pedal will work. I am still considering the Terminator X over HP Tuners but just hoping it all works out.
Brad, if you're subscribed to this thread, what was the part# combination/solution for your GTO LS2 with the OE GTO pedal?
3 years later nothings changed
I have a 06 gto 6.0. I bought ur 58x kit. Switched the wires needed as showed in video. But can’t find the injector part number for my application. Also it’s showing the crank sensor light is blue
Great info, i currently have a gen3 24x ls1 running with stock ecu and was thinking of getting terminator x for tunning ease but plan on eventually switching to a gen4 ls3 in the future, so you would recommend to buy 58x harness do this modification to work on ls1 and reverse the mod when i get a gen 4?and would anything be needed to be done to the knock sensor?
What about using this on a LS4? trying to do a fiero swap. Want to use terminator engine management.
So I have a 24x crank sensor and a 4 cam gear I got by mistake so by switching the 2wires on the cam wiring harness and change the settings I should b good to go I’m hoping I understand this right but my terminator system is for the 24x 2002 where the Knox sensor r in the vally I have a harness extension I made so the cam sensor plug would reach
I have a 58X crank, 1Xblock, and mistakenly bought a 24x/1x harness. I opened up the harness and made sure the crank sensor was supplied with the 5V reference from pin A26. I sure hope this works, will be attempting a first fire up in a few weeks
I don’t have weeks man come on
Well how did it go and did you switch wires on then crank sensor?
Same here... but running a gen7 big block with 58x crank and 1x cam sensors. Ordered the Holley 24x/1x kit and hope it will work by extending the cam sensor harness.
So you only have to switch the cam sensor wires and not the crank? I’ve got a ls2 engine and I ordered a new harness that is the 58x to replace the 24x harness I was running.
how can I tell if I have a 1X or 4X cam sensor? I have the 24X harness on an LS2 and holley tech support recommended I buy an extension for the cam sensor plug, do I still need to repin the connector in this case?
So you just swap pins on the cam sensor then cut the key out of crank sensor then modify the settings and boom it’s good?
Can you make a video on converting the 24x harness to work with 58x engines?
Just flip it as mentioned
I have a basic gen 3 24x 5.3. Picked up a 58x system. All I need to do is swap the pins?
I have a gen4 block with a gen3 crank sensor. Its a 24x but the hookup in the front. I got a terminator x 24x. Need help
thanks worked for me 58x harness on 24x lm7 truck engine just swaped wires and picked 24x on the setup wizard.
What injectors did you run ?
@@vegas915 you can run any injector you want with any style plug they sell adapter plugs for the harness on ebay
Thanks. Same thing here. I was waiting for a 24x stealth system but can’t find them anywhere. Found a 58x so I ordered it. When it get here I can switch the wires and change the settings and be good.
So knock sensor wires were long enough? That’s my only other worry now
@@brentdavis2596 there are no knock sensor wires to hook up
Can you not run the Terminator X only off the crank sensor without a cam sensor at all like some other manufacturers do
yes you can
Hello. I had to swap engine to a 24x 1x cam. I had a 58 x 4x. I did as you show in the video and the engine will not fire. I had to go in the settings and select no cam sensor. Then the engine will start. But has a weird surge off idle and very bad when trying to drive. Is no cam sensor my issue. Also why will mine not start with the cam sensor selected?? Any help is greatly appreciated!! Thank you.
So can I take a 58x harness 558-103 and make it work for a ls1 with a 24x and 1x just by doing this ?
If I got the terminator x max ls1 24x (550-919) am I restricted ls1 motors or am I able to go any 5.3 4.8 6.0 with the system ? Got it for a steal on market place lol thanks in advance haven’t gotten a clear answer. Sorry new to this
Everything I see, the front cover cam sensors are the same, so why the wire swap? I understand those wires need swapped from a rear mounted to front cover mounted. I have a 24x 1x LS2 i am going to use a terminator on, and Holley said I need an ls1/ls6 set up, which I dont agree with.
This is really confusing. Based on reading the comments, is it correct to say that a stock 2006 GTO LS2 has a 24X crank sensor and 1X cam sensor? And the correct Holley harness would be the 58X harness with NO NEED to swap the A & C cam harness pins?
If I understand what's been written in the comments, the cam pin swap is only necessary if using a 4X cam sensor. But the stock 2006 GTO LS2 cam sensor is 1X, so there is no need to swap the cam sensor pin position if using the 58X Holley harness on a stock 2006 GTO LS2?
Is Holley going to make a wire harness or adapter to piggyback off of the factory wire harness? For those of us who would love to get the terminator x, but needs to install on our daily driver. That needs to get inspected once a year
Nope. Holley doesn't want deal with any of the emissions requirements. They are going to stay strictly "off road" vehicles.
Hey bud, that's for the excellent How to. One thing , ive got a factory ls2 24x 1x here with the front cam sensor and I'm going to order the Terminator x 58x1x kit. do I need to swap A-C wires on both the cam and crank sensors or just changing the software setting for the crank will suffice as you did?
From what I saw that was it and I'm thinking of just grinding the tab down on the 24x sensor and plugging it in!
Did you ever find out lol
@@MrToastado swap a&c on cam only
What about a 58x on a 24x Holley?
I have a gen 3 ls with a 58x crank and a 1x cam. I purchased a 58x crank sensor now do i need to change the crank or cam wires to get the 5v reference
No
Doing a 58x harness on a 24x engine, do you guys sell a knock harness or do I have to do some custom wiring?
You will have to modify the stock wiring. J
Holley can you educate us on how to do so?
This kind of unrelated i guess but on the 24x cranks sensor should i have 12 volts at both red and purple wires? Im only getting 1.59 on the purple.
give our tech line a call for assistance! 866-464-6553
So for LS1 24X/1X , to LS3 58X/4X, I need to repin the Cam and Crank as shown?
I don’t think the crank needs to be ripinned just the cam….u just have to remove a tab on crank sensor from what I’m hearing
But yeah I’m in the same boat as you, I have 2 cars running a 24x terminator x and have a spare 58x 6.0 on standby for when one of my gen 3’s give up the 💨 smoke
I have a running 58x 4x combo with the Holley LS 2 harness and a Dominator. I'm replacing the engine with a 24x 4x engine. Can I still use the 58x sensor and harness without modification to the harness. And configure the ignition to custom 24x 4x? I understand I'll need to check timing to reset the inductive delay and timing offset.
Yes, you can use the 58X harness with the 24x engine but you will have to use the correct 24x sensor for your engine. You'll need to swap the connector on the 58x harness for one that will plug into your 24x sensor. Be sure to go into the software and select the custom tab under the ignition type, then select 24x crank and 4x cam. Thx J
@@HolleyPerformance Thank You
@@chifenparker Your welcome, Also . If you are using a timing cover mounted 1X sensor on a 4X wheel you will need to swap the A and C pin in the connector.
@@HolleyPerformance I only see one cam sensor for front mounted. Applications or 2005 Corvette and 2010 Silverado has same part# cam sensor.
@@HolleyPerformance Are you sure its 24x and 4x cam? I'm pretty sure there's no such animal. All the 24x LS2's should be 24x crank & 1x cam (but mounted in front cover)
Just found this video and read comments. I’m completely confused. I ordered 2 terminator 24x kits for the two builds i’m working on. Both engines are a 24x with a 1x cam sensor. Now you say I should have ordered the 58x? Why can’t I just add a extension harness to the cam sensor and get a knock sensor harness that works with sensors on the side of the engine. Do I still have to switch the A and C terminals on the cam sensor harness?
Why didn’t you guys actually make a harness that fits correctly?
i just did same thing using the extension cable for cam sensor im having problem with crank and cam syncing
Holley can you please respond to some of these comments
@@jonathanmoore5112 man if you have 24 x crank and the 1 x cam you have the right system,you dont have to repin anything or piggy back any wiring,i found my problem was that i ordered a extension cable for cam sensor and they had already switched the wires all i had to do was switch them back,mine runs like a scalded cat now!
What about going from a 24x 1x to a 58x 4x?
I'm hoping they reply to you so I can see the answer lol
@@westhompson7295 I called them... all you’ll need to do is swap the cam plug configuration. That’s all I did per their instructions and it will work.
@@richardgreen1142 so just swap the “A” and “C” wires on the cam sensor, and put 58x 4x on ignition settings on the ecu?………really I just literally have to swap those 2 wires????…….I’m running a 370 lsa supercharged lq9 right now and have a l96 on standby, when and if the lq9 gives up the smoke…..I also have a vortech supercharged lm7 in my c10….so the l96 is gonna go to the first one that needs it….I was on the fence about buying a 24x crankshaft for it , but if it’s literally a 2 wire swap I will save my money for something else
My original engine was 58 but I put the 24 in it can't get it to run I need help what can I do
Did you ever figure out how to get it to run?
@@victornevels989 I think the wires need to get swapped
Does the wiring on the connector for the crank need to be swapped? Can I just grind down the tab on the 24x crank sensor and plug it and set the settings for 24x?
Yes, you could shave the tab and use the connector but If you are using a timing cover mounted 1X sensor on a 4X wheel you need to swap the A and C pins in the connector. Thx J
@@HolleyPerformance just on the cam sensor?
@@screamerobsz0644 Yes, use a 24x crank sensor and shave the tab on the harness connector. Swap the pins if you're using a 1x sensor on the 4x wheel.
What if you run a 4x sensor with a 1x sprocket?
My truck kept losing sync. And it would backfire. I have the 58x harness, 24x sensor and crank reluctor, tining cover mounted 4x cam sensor and 1x sprocket. Turns out all I needed to do was modify the crank plug to fit, I swapped the cam wires, and it wouldnt run right, swapped them back and all is good now
If I was to purchase Terminator X Max 24 X1 for my 2002 lq4 and decide to upgrade later to a newer 2006 lq4? Can I make the modifications to do so on the Terminator X Max without having to make a second purchase? Plan on pushing the engine to its limits and I'm sure I'll have to replace it
The harness would have to be replaced in your set-up, unless you get the 58x harness and convert to 24x. Then when you swap to the 2006 engine you can return the 58x harness you converted to 24x use, back to 58x configuration. Thx J
2006 lq4 is 24x you already have everything you need. Only 2006 corvette and ctsv were 58 in 06. 05 to 07 gets confusing.
So if you buy a terminator x for 58x it will run both 24x and 58x with modifications to the harness ?
Yes. You can switch up the harness to make it work on either. -Keith
@@HolleyPerformance so if I bought the 24x it won't work for 58x..
@@slowpokrodz956 were you able to make 28x work to 58x?
@@julioe9690 in my case I just swapped out the reluctor wheel from 58x to 24 x tooth and then switched the wires on the cam sensor..
@@slowpokrodz956 the A and C wires?
Hi. I have this same situation. What ive found is the 24t black crank sensor doesn't plug into the 58t loom. Do I use the grey 58t sensor to read the 24t crank?
You need to keep the sensor that is designed for your engine! Swap the connector on the harness for the one that corresponds with your engine's sensor and be sure to wire it correctly for your set-up. Use the custom drop-down menu to choose your cam and crank sensor type under the ignition tab. thx J
Are the connectors wired the same?
@@screamerobsz0644 yes...I think so as I haven't done it yet have had it confirmed. As for the connector you can just file the tang off in the plug to go from the 58t plug to 24t sensor
@@screamerobsz0644 Yes, unless you are using a timing cover mounted 1X sensor on a 4X wheel. If so you will need to swap the A and C pins in the connector. Thx J
what about going from a 24x to a 58x?
The best way is to swap the reluctor wheel and sensor. Or you would need an aftermarket box to convert the signal or a tuner that is capable of converting. Thx J
HolleyPerformance on a terminator x max that was originally setup for a gen 3 24x it wont work by selecting the 58x and adding the front cam harness?
@@brandonbetterton6609 did it ever work?
@@brandonbetterton6609 did it work
This video is EXTREMELY confusing
1:30 he is holding CRANK sensors in his hand, and saying that 'their' operating voltages are different, speaking about the crank sensors?? I DONT KNOW
because at
1:39 he puts down the CRANK sensors and randomly out of nowhere starts to talk about the cam sensors, so which is it? The crank sensors or cam sensors voltages are different?
Then, picking up the CAM harness he swaps the cam sensor plug wires, leading us to believe that the CRANK sensors are identical between 24x and 58x
ARE THEY? I DONT THINK SO
So you are saying a 58x harness will work with both 58x and 24x sensors because both sensors switch at 3v. And the 58x harness is 5v supply voltage.
yes
@@HolleyPerformance hi. Just reading your reply but the 24t crank sensor and the 58t have different plugs. Which sensor should I use
@@jamieknight9636 You will have to use the sensor your engine is designed for. If you're using the 58x harness on a 24x engine you will have to swap the connector on the harness out for the 24x style and wire it correctly. Thx J
So my 58x harness wich is now going to power 24x ,4x I don’t need to supply 12v to crank reference? It will still work correctly with the 5v?
I have a 550-905 kit “ls2” 24x 1x motor and swapping the pins cause the cam sensor to read nothing and have the crank sensor go crazy. I swapped it back to normal and it runs just fine. So don’t listen to this guy
Yeah I’m starting to see that this video is full of shit and the folks over at Holley know just as much about their product as the clowns do over at fi-tech.
Ok, not sure what the issue is, but this is NOT true in all cases, I have a 550-010 setup, running a 24xcrank 6.0, LS9 cam, front mounted cam sensor, 1X gear. Was told to follow this video by Holley tech dept, engine would not start, only back fired, was told cam sensor was bad, $70 later(new GM) no change, numerous calls/emails got nowhere. The cam syc light would go red when you tried to start. After 3 weeks of jerking around I swapped the wires back to original position, started right up, so something screwy here.
How did you set it up in the wizard when you changed the wires back to normal, as a 58, 24, or custom in the software? Pretty sure I’m having the same exact issue right now and I’m about to swap them back to normal
@@JackmeriusTaktheritrix just set as 24T which is what I have, has run fine