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wiring 99 ls1 into a 2000 firebird

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Old 09-03-2014, 03:26 PM
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Default wiring 99 ls1 into a 2000 firebird
New guy here...I'm in the process of doing an ls1 swap on my 2000 firebird and the donor car is a 99 trans am. I'm about ready to put the ls1 in the firebird I just need to do the wiring. I need to know if the 99 harness will plug and play with the 2000 or will I have to go in and rewire something? It all looks like it'll plug up and work but I don't want any surprises...thanks in advance
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Old 09-03-2014, 08:36 PM
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I believe all the wiring was the same from 99-02 but I'm not 100% positive.

Anyone else want to chime in?
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Old 09-03-2014, 08:51 PM
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I read that the 99s have that low coolant sensor and the 00 didn't so I didn't know if there were anymore major differences...should be put in and on the road this weekend
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Old 09-03-2014, 09:23 PM
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00birdls1 welcome to LS1tech!

The wiring for the engines is the same between 1999 and 2000. All fourth generation F-bodies had a coolant level sensor in the radiator on the passenger side tank.
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Old 09-03-2014, 09:25 PM
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Ok cool so I shouldn't have any trouble hooking everything back up and it working
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Old 09-03-2014, 09:35 PM
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Yessir.
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Old 09-03-2014, 09:40 PM
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Good deal thank yall
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Old 09-03-2014, 10:17 PM
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Is your 2000 Firebird an LS1 Formula or a V6 Firebird?
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Old 09-03-2014, 10:20 PM
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It started out as a v6 but I'm swapping to an ls1
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Old 09-04-2014, 12:55 AM
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That's what I suspected. The wiring issue is a little more complicated. I assume you have a complete LS1 engine harness. There's a wire to run to the fuse block IIRC to get the injectors to work.

I tried to find the thread that details this but couldn't ...
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Old 09-04-2014, 07:16 AM
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PM this guy and he should fill you in on everything you need to know. He swapped an LS1 into a V6 Firebird and it went rather well for him.
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Old 09-04-2014, 07:28 AM
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Originally Posted by RevGTO
That's what I suspected. The wiring issue is a little more complicated. I assume you have a complete LS1 engine harness. There's a wire to run to the fuse block IIRC to get the injectors to work.

I tried to find the thread that details this but couldn't ...
I took the entire wiring harness from the engine bay including fuse boxes light sockets the whole nine yards...will I still need to run that wire?
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Old 09-04-2014, 12:33 PM
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Originally Posted by TechCam97
PM this guy and he should fill you in on everything you need to know. He swapped an LS1 into a V6 Firebird and it went rather well for him.
Messaged that guy he said since I'm swapping fuse boxes to I don't have to run any wires so I shouldn't have any issues and should be on the road this weekend for a Sunday cruise
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Old 09-04-2014, 12:41 PM
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Originally Posted by 00birdls1
Messaged that guy he said since I'm swapping fuse boxes to I don't have to run any wires so I shouldn't have any issues and should be on the road this weekend for a Sunday cruise
Good to hear!
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