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4.8 V-8 Firing Order VIN V

4.8 V-8 Firing Order VIN V

4.8 V-8 firing order VIN V

4.8 firing order

4.8 V8.VIN V Firing Order

GM 4.8 V-8 Firing order and history

The GM 4.8 Vortec engine is a small-block V8 engine that was produced by General Motors between 1999 and 2014. It was mainly used in the Chevrolet Silverado 1500, Tahoe, and Express, and its GMC counterparts the Sierra 1500, Yukon, and Savana1. The engine was available in three generations, each with slightly different specifications.

The first generation of the 4.8 Vortec engine was part of GM’s third generation of small-block LS/Vortec V8 engines. It was produced from 1999 to 2006 and was identified by having a V as the 8th digit of the VIN. The engine code for this generation was LR4.

Specifications first generation

Displacement: 4.8 liters (293 cid)
Bore and stroke: of 96 mm x 83 mm (3.78 in x 3.27 in).
Horsepower: Depending on the model and year, it made 255-302 horsepower and 285-305 lb-ft of torque.
Compression ratio: 9.4:1 (LR4).
Engine block: cast iron block with a 90° V8 configuration
Cylinder heads: aluminum a 90° V8 configuration. T
Valves: overhead valve train with 2 valves per cylinder. L20 generation had variable valve timing
Fuel: Electronic fuel injection fuel system.

Second generation of the 4.8 Vortec engine was produced from 2007 to 2009 and used the LY2 engine designation. The only significant change was to the compression ratio of 9.1:1

The final generation of the 4.8 Vortec engine was produced from 2010 to 2014 and used the L20 engine designation.
Lower compression ratio of 8.8:1 and made slightly less horsepower and torque than the previous generation.

Common problems with the GM 4.8L engine

High oil consumption
Oil pressure problems
Faulty knock sensor
Water pump failure
Intake manifold gasket leak

©,2009 Rick Muscoplat

Posted on by Rick Muscoplat


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