![]() In order to reuse as many of the factory components as possible, you need to get all of them with the engine. Each engine requires the use of its own specific computer and harness, and keep in mind that there were changes made to each system year by year. This includes the computer, wiring harness, mass airflow sensor (MAF), oxygen sensors, and if the engine is drive-by-wire, the gas pedal and throttle actuator control (TAC) module. Let me repeat: it is imperative to get everything. If you picked up an engine from a salvage yard or other used vehicle, you need all the electrical components to go with it. Although the factory systems are certainly adequate, the aftermarket has fully embraced the LS platform and there is definitely more than one way to do it right. These systems can be overwhelming, but the key is to tackle one circuit at a time. On many LS engines, even the throttle is computer controlled the pedal is connected to a sensor box that tells the throttle how much to open. Gen III/IV engines feature complex computers that control everything from timing and ignition to fuel and air intake. It is not a simple plug-and-play procedure, so make sure you are up to the task before hacking into the wiring harness. Retrofitting the stock harness requires knowledge of electrical circuits, soldering skills, and attention to detail.
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June 2023
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