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The 3.6-liter V6 LLT is an engine produced by General Motors for use in a wide variety of mid- and full-size vehicles. The 3.6L LLT delivers a market-leading balance of good specific output, high torque over a broad rpm band, fuel economy, low emissions, and first-rate noise, vibration and harshness control, with exclusive durability-enhancing features and very low maintenance. The V6 VVT engine family was developed with pressure-actuated oil squirters in all applications.
Direct Injection: direct injection moves the point where fuel feeds into an engine closer to the point where it ignites, enabling greater combustion efficiency.
High-Pressure Engine-Driven Fuel Pump: an engine-driven high-pressure pump supplies fuel to the injectors to overcome the higher pressures inside the combustion chamber, as well as supply the multiple injection points of the direct injection nozzles. Dual Overhead Cams with Four Valves per Cylinder and Silent Cam Drive: four-valves-per-cylinder with inverted-tooth chain cam drive contributes to the smoothness and high output of the LFX. ABOUT GM AUTHORITY GM Authority is a must-read for GM news, GM rumors, GM reviews, and information about General Motors vehicles. Join others in discussing The General in our GM Forums and browse photos of GM vehicles in our GM pictures gallery. Please note that GM Authority is a product of Motrolix LLC and is not sponsored, owned, or in any other way condoned by General Motors Company, its brands, subsidiaries, or partners.
On most Chevrolet engines the #1 cylinder is the first cylinder at the front of the engine on the driver side (left side) of a rear-wheel drive car or truck.
The cylinders are numbered in a staggered sequence going from side-to-side, starting with the #1 cylinder going towards the back of the engine (see illustrations below).

The correct firing order is very important because mixing up the spark plug wires may prevent the engine from starting, cause it to backfire and run very poorly if at all.
NOTE: On engines where two adjacent spark plugs fire right after each other, it is important to make sure the spark plug wires are not routed right next to each other for a long distance. On engines with distributorless ignition systems or coil-on-plug ignition systems, the firing order is controlled by the ignition module or engine computer.
This website is property of and maintained by AutomotiveTouchup, a Microfinish LLC Company © 2002-2016. The paint code for all Cadillac cars are located on the service parts identification sticker. Part of GM’s High Feature V6 VVT engine family, the LLT was among the first within the automaker to acquire direct injection.
Upon its release, it applied the most advanced automotive engine technology available, from state-of-the-art casting processes and full four-cam phasing to ultra-fast data processing and torque-based engine management.
This aluminum-intensive construction means less weight and greater efficiency than conventional cast-iron engines a€“ and less weight translates to improved vehicle fuel economy. The pistons are made of lightweight cast aluminum and feature a friction-reducing polymer coating on the skirts, as well as fully floating wrist pins, which also help reduce friction. The jets reduce piston temperature, which in turn allows the engine to produce more power without reducing long-term durability.
It fosters a more complete burn of the fuel in the air-fuel mixture, and it operates at a lower temperature than conventional port injection.

This variable-pressure high-pressure pump feeds a high-strength stainless steel fuel rail attached to the injectors. It allows linear delivery of torque, with near-peak levels over a broad rpm range, and high specific output (horsepower per liter of displacement) without sacrificing overall engine response, or driveability. See ad details, contact the seller or find other GMC Sierra 2500HD vehicles for sale from Metairie in just seconds.
The engine is currently being replaced by the more efficient and powerful LFX, with the Lambda-based crossovers (Chevrolet Traverse, Buick Enclave, GMC Acadia) being the last vehicles to be equipped with the LLT unit.
The sand-mold-cast block features strong cast-in iron bore liners, six-bolt main caps, and inter-bay breather vents. Less weight in the pistons means less reciprocating mass in the engine, which in turn means less inertia and greater operating efficiency.
That allows the mixture to be leaner (less fuel and more air), so less fuel is required to produce the equivalent horsepower of a conventional, port injection fuel system. Direct injection also delivers reduced emissions, particularly cold-start emissions, which are cut by about 25 percent. In conjunction with the smaller pitch chain, the number of teeth on the sprockets are increased, which increases the meshing frequency and further reduces noise and vibration.

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