Gm Ls3 Engine Wiring Diagram

The engine control module is the brain of your Gen IV LS-powered project vehicle. The LS3 engine wiring or as many call it LS3 engine management system requires solid integration with the GM LAN and all associated computers. Retrofitting a stock wiring harnessis seemingly complex and perhaps overwhelming.

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Each Chevrolet Performance controller kit is a true stand-alone system.

Gm ls3 engine wiring diagram. For engine retrofits many PCMs excluding 2003- newer have an AC on input that allows the PCM to adjust for the additional engine load avoiding low-RPM stumble. Just like the fuel pump different versions of the LS3 engine harness have different colors for the cooling fan wire. Engine Control Module 19257235 LS3 17T 17 tooth trans speed signal with 19257236 Engine Control Module.

This could be an ideal situation for someone who picks up a junkyard engine with a botched harness they arent always nice to the wires on the way out. Change or alter any wiring in the accelerator pedal or electronic throttle systems. While electronically compatible with the LS1LS6LS2 MAP sensor the LS3 MAP sensor is not a direct fit to the early intake manifolds uses a different harness connector and its pin configuration is unique.

The 62 liter LS3 V8 engine is currently produced by Chevrolet Performance as a crate engine offering a peak output of 430 horsepower at 5900 RPM. Vehicle Requirements Maximum Vehicle GVWR Gross Vehicle Weight Rating 53L LC9 Engine 7200 lbs or less 62L LS3 Engine 5725 lbs or less. With Chevrolet Performances aggressive ASA camshaft installed in the LS3 62L engine it comes alive with 525 uncompromising horsepower.

All thats needed to get a vehicle running with it are power and ground sources a high-pressure fuel pump and an electric cooling fan. Welcome to the LS3 wire harness built by Speed Scene Wiring Made USA. That means there is plenty of room to power a stock 400-hp LS3.

And Chevrolet Performance is your source for controllers designed for easy plug-and-play installation and in most applications there is no need for third-party tuning adjustments. All PSI Harnesses are Made in the USA. These harnesses include the Gen II LT1LT4 Gen III 24x LS1LS6 and Vortec Truck Engines as well as Gen IV 58x LS2 LS3 LS7 Vortec and GEN V LT ECOTEC3 Engines.

The majority of the wires in the stock harness are not needed in a retrofit application. These harnesses include the Gen II LT1LT4 Gen III 24x LS1LS6 and Vortec Truck Engines as well as Gen IV 58x LS2 LS3 LS7 Vortec and GEN V LT ECOTEC3 Engines. Solder or alter any Oxygen Sensor wiring.