Here you will find general information about the 1998 to 2002 F-Body LS1 wiring harnesses. A few things to keep in mind. The 1998 harness used a different PCM. Lay out may be the same, but the PCM pinouts were entirely different. Must use 1998 Harness with a 1998 PCM. (Note that 1997 LS1 Corvette uses same PCM as 1998) 1999-2002 wiring schematics and pinouts should be very similar, if not the same.
1998 LS1 F-Body Harness Connector Pinouts - Note that 1998 had 3 connectors under the dash C210, C220, C230
2000 LS1 F-Body Harness Connector Pinouts
2001 LS1 F-Body Engine Wiring Schematics
2001 LS1 F-Body PCM Connector Pinouts
Below is a before and after picture of a LS1 Automatic wiring harness I recently modified. This is what you would get if you sent your LS1 F-Body wiring harness to me to be reworked. Click picture to see a high resolution image.
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The modified LS1 harness has the rear oxygen sensors removed, and the front O2's are relocated to allow use with long tube headers. I can also leave these in stock location, if using stock manifolds. I also move the Crank Sensor (CKP) to allow the harness to stretch out more, and allow PCM placement under the dash. Near the PCM is the Diagnostic Port, Check Engine Light, and some other wiring needed to complete the install.
Email me with any questions, lt1swap@centurytel.net