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The 2003 GMC Yukon XL is a robust SUV designed for both luxury and utility. Powered by a 6.0L V8 LQ4 Iron engine with multipoint fuel injection, it offers impressive performance and 4WD capability. Built by General Motors in Janesville, Wisconsin, this model is part of the 1500 luxury series and falls under the Class 2F weight category. Ideal for families and adventure seekers alike, the Yukon XL combines spaciousness with power.

Decoded VIN:

Make

GMC

Manufacturer Name

GENERAL MOTORS LLC

Model

Yukon XL

Model Year

2003

Plant City

JANESVILLE

Series

1500 (1/2 Ton) Luxury

Vehicle Type

MULTIPURPOSE PASSENGER VEHICLE (MPV)

Plant Country

UNITED STATES (USA)

Plant Company Name

GM Truck Group

Plant State

WISCONSIN

Body Class

Sport Utility Vehicle (SUV)/Multi-Purpose Vehicle (MPV)

Gross Vehicle Weight Rating From

Class 2F: 7,001 - 8,000 lb (3,175 - 3,629 kg)

Drive Type

4WD/4-Wheel Drive/4x4

Engine Number of Cylinders

Displacement (CC)

6000.0

Displacement (CI)

366.14246456839

Displacement (L)

6.0

Engine Model

LQ4 Iron

Fuel Type - Primary

Gasoline

Engine Configuration

V-Shaped

Fuel Delivery / Fuel Injection Type

Multipoint Fuel Injection (MPFI)

Most common problems:

Oil consumption

The LQ4 Iron engine is known for higher oil consumption, which might be due to worn piston rings or valve seals.

Intake manifold gasket failure

Over time, the intake manifold gaskets can deteriorate and lead to vacuum leaks, causing rough idling and poor performance.

Knocking sounds

The LQ4 engine can develop knocking sounds due to carbon buildup on the pistons or worn rod bearings.

Coolant leaks

The water pump and radiator can develop leaks, leading to overheating issues.

Sensor failures

Common issues include malfunctioning oxygen sensors and mass airflow sensors, which can affect fuel efficiency and engine performance.

Fuel injector issues

Fuel injectors may become clogged or fail, leading to misfires and poor engine performance.

Throttle body problems

The throttle body can become dirty or fail, causing erratic idling and acceleration issues.

Timing chain wear

Over time, the timing chain and its components may wear out, potentially leading to timing issues and engine damage.

Exhaust manifold cracking

The exhaust manifolds can crack due to heat cycles, leading to exhaust leaks and increased noise.

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