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LTX and LSX Putting LT1's, LS1's, and their variants into Third Gens is becoming more popular. This board is for those who are doing and have done the swaps so they can discuss all of their technical aspects, including repairs, swap info, and performance upgrades.

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Old 11-01-2007, 10:09 PM   #1
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LS1 ECU and harness upgrade?
If I was to purchase a 98 LS1 with no ecu or harness can i get a 99 or new ecu and harness and just plug and play? or is their a lot of sensors that will need changed. I've been serching for hour and got nothing.
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Old 11-01-2007, 11:10 PM   #2
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Re: LS1 ECU and harness upgrade?
You can use a 99+ PCM and harness with no problems at all. I want to say that the coil packs are different.....but I haven't compared my 98 coil packs to a 99+
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Old 11-02-2007, 04:20 PM   #3
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Re: LS1 ECU and harness upgrade?
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Originally Posted by Klortho View Post
You can use a 99+ PCM and harness with no problems at all. I want to say that the coil packs are different.....but I haven't compared my 98 coil packs to a 99+
Coils for the 98 are all seperate whereas the 99+ are mounted together iirc. I had no clearance issues with my 98 coils since the mounting brackets are small. Others have used 6.0 truck coils to help with clearance.

edit: Oh yea, I used a 99+ harness and PCM on my 98 motor with no problems.
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Old 11-02-2007, 11:33 PM   #4
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Re: LS1 ECU and harness upgrade?
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Originally Posted by dingle View Post
Coils for the 98 are all seperate whereas the 99+ are mounted together iirc. I had no clearance issues with my 98 coils since the mounting brackets are small. Others have used 6.0 truck coils to help with clearance.

edit: Oh yea, I used a 99+ harness and PCM on my 98 motor with no problems.
Great thats what I was looking for.
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Old 11-02-2007, 11:33 PM
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