Anyone ever use a truck harness for an Ls1 swap.
04-30-2009, 10:46 PM
#1
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Anyone ever use a truck harness for an Ls1 swap. I am trying to do an LS1 style engine swap in my 71 Firebird and am in need of an engine harness on a budget. I have heard that you can make the truck harness work but it is hard to do. Any suggestions?
05-01-2009, 10:45 AM
#5
you could change the connectors, or just pick up a set of truck injectors. I like using the truck harnesses better, the wires seem to be longer and you can route them how you want.
05-01-2009, 10:54 AM
#6
they make adapters to go from one connector style to the other. i think fic has 'em.
edit: in fact, i believe this is what you need. little spendy though.
edit: in fact, i believe this is what you need. little spendy though.
05-01-2009, 06:45 PM
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If the truck harness has the electronic throttle, and you are running the cable style, you will have to re-pin the PCM connector to have discrete connectors for the IAC, IAT, and TPS (did I forget any?)
The LS1 uses a different connector than the truck for the fuel injectors. The LS1 is a Minitimer and the truck is an USCAR.
I think the GM product line used the Minitimer connectors since about 1985, so there should be plenty in the local junkyard that you can solder on to your leads - but you can pay big-bucks for an adapter if you want to.
If you are running the LS1 style manifold, you are going to have a hard time fitting the truck injectors in it without some sort of custom fuel rail - the truck injectors are much shorter than the cars.
The LS1 uses a different connector than the truck for the fuel injectors. The LS1 is a Minitimer and the truck is an USCAR.
I think the GM product line used the Minitimer connectors since about 1985, so there should be plenty in the local junkyard that you can solder on to your leads - but you can pay big-bucks for an adapter if you want to.
If you are running the LS1 style manifold, you are going to have a hard time fitting the truck injectors in it without some sort of custom fuel rail - the truck injectors are much shorter than the cars.
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05-02-2009, 05:32 PM
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You will only have the add 7 wires total to make the TPS and IAC work.
If you find an earlier truck harness you wont have to add these.
The injector connectors are less than 2$ each and easy enough to solder on.
Also remember you may need to change around a few other pins on the C1 and C2 connectors to match the camaro PCM pinouts.
If you find an earlier truck harness you wont have to add these.
The injector connectors are less than 2$ each and easy enough to solder on.
Also remember you may need to change around a few other pins on the C1 and C2 connectors to match the camaro PCM pinouts.
05-03-2009, 03:59 PM
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FWIW I'm running an 04 Yukon PCM with a modified 04 GTO programming. (04 GTOs were the only ones to have DBC. O5-06 were DBW) Just something to think about.
05-03-2009, 04:28 PM
#15
You could just take apart the Fuel Injector Connectors and re-pin them with some LS1 Injector Connectors
I have a set of 8 LS1 Injector Connectors that I snipped off of my Harness when I put my LS2 ones on. I can take what's left of the wiring out of them, label them and send them your way if you are interested.
I have a set of 8 LS1 Injector Connectors that I snipped off of my Harness when I put my LS2 ones on. I can take what's left of the wiring out of them, label them and send them your way if you are interested.
05-03-2009, 09:45 PM
#18
You are correct that is the exception, along with 4.3 S-10 ECM's
03 and later truck serv# ECM's do not have IAC drivers on board, I have verified this by actually looking at the board. It was a cost savings thing by Delphi when the majority of the GM line went BDW in 03, who would guess saving $.50 on a driver semiconductor in each ECM would add up. They still built limited IAC compatible ECM's for vans and S-10s though
I am running an 04 Express Van ECM 12586243 on my 03 BDW motor converted to cable TB with an 02 cal
*Also he cannot just swap the plug body over from harness to harness. The pins utilized in the two plugs are different.
03 and later truck serv# ECM's do not have IAC drivers on board, I have verified this by actually looking at the board. It was a cost savings thing by Delphi when the majority of the GM line went BDW in 03, who would guess saving $.50 on a driver semiconductor in each ECM would add up. They still built limited IAC compatible ECM's for vans and S-10s though
I am running an 04 Express Van ECM 12586243 on my 03 BDW motor converted to cable TB with an 02 cal
*Also he cannot just swap the plug body over from harness to harness. The pins utilized in the two plugs are different.
Last edited by ryanvv355; 05-03-2009 at 09:59 PM.
05-03-2009, 10:27 PM
#19
You are correct that is the exception, along with 4.3 S-10 ECM's
03 and later truck serv# ECM's do not have IAC drivers on board, I have verified this by actually looking at the board. It was a cost savings thing by Delphi when the majority of the GM line went BDW in 03, who would guess saving $.50 on a driver semiconductor in each ECM would add up. They still built limited IAC compatible ECM's for vans and S-10s though
I am running an 04 Express Van ECM 12586243 on my 03 BDW motor converted to cable TB with an 02 cal
*Also he cannot just swap the plug body over from harness to harness. The pins utilized in the two plugs are different.
03 and later truck serv# ECM's do not have IAC drivers on board, I have verified this by actually looking at the board. It was a cost savings thing by Delphi when the majority of the GM line went BDW in 03, who would guess saving $.50 on a driver semiconductor in each ECM would add up. They still built limited IAC compatible ECM's for vans and S-10s though
I am running an 04 Express Van ECM 12586243 on my 03 BDW motor converted to cable TB with an 02 cal
*Also he cannot just swap the plug body over from harness to harness. The pins utilized in the two plugs are different.
As far as the differrances in the PCM harness plugs, the major issue is the Blue / Green plugged harnesses for drive by cable had the grounds for the O2 heaters returned through the PCM, so they could shut them off, so it wouldn't be hard to repin a harness from a Blue / Red plugged PCM to work with a Blue/ Green PCM
05-04-2009, 12:44 AM
#20
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Since I bought a 5.3L engine with the 03 truck intake on it, can I just use the injectors off of the truck intake for the LS1 intake? The only thing is, I am pretty sure it is a Flex-Fuel engine. Can I use these injectors...or do I have to change the connectors for the LS1 style injectors and use LS1 injectors? Thank's for the help guy's!! Tim.