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The 1991 GMC Suburban is a robust 4WD SUV powered by a 5.7L V8 engine with throttle body fuel injection. Manufactured by General Motors in Flint, Michigan, this 3/4 ton vehicle offers a durable hydraulic brake system. It’s designed for versatility and heavy-duty performance, ideal for both passenger and multipurpose use.

Decoded VIN:

Make

GMC

Manufacturer Name

GENERAL MOTORS LLC

Model

Suburban

Model Year

1991

Plant City

FLINT

Series

3/4 Ton Nominal

Vehicle Type

MULTIPURPOSE PASSENGER VEHICLE (MPV)

Plant Country

UNITED STATES (USA)

Plant Company Name

NA - Truck Platform

Plant State

MICHIGAN

Series2

Conventional Cab

Body Class

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

Gross Vehicle Weight Rating From

Class 2G: 8,001 - 9,000 lb (3,629 - 4,082 kg)

Drive Type

4WD/4-Wheel Drive/4x4

Brake System Type

Hydraulic

Engine Number of Cylinders

Displacement (CC)

5700.0

Displacement (CI)

347.83534133997

Displacement (L)

5.7

Fuel Type - Primary

Gasoline

Engine Configuration

V-Shaped

Fuel Delivery / Fuel Injection Type

Throttle Body Fuel Injection (TBI)

Other Engine Info

LPG conversion can be accomplished on the engine.

Engine Manufacturer

CPC

Most common problems:

Brake fluid leaks

Hydraulic brake systems can suffer from leaks in the brake lines, master cylinder, or wheel cylinders, causing a loss of braking power.

Brake fade

Prolonged use can cause the brakes to overheat, reducing their effectiveness temporarily.

Worn brake pads or shoes

Regular wear and tear can cause brake pads or shoes to thin out, leading to decreased braking efficiency and potential damage to the rotors or drums.

Warped brake rotors

Overheating or uneven pressure can cause the brake rotors to warp, leading to vibrations and reduced braking performance.

Engine misfires

V-shaped engines, especially with 8 cylinders, can experience misfires due to issues with spark plugs, ignition coils, or fuel injectors.

Oil leaks

V8 engines are prone to oil leaks from valve cover gaskets, oil pan gaskets, or rear main seals.

Cooling system issues

V-shaped engines generate significant heat, which can lead to problems like radiator leaks, thermostat failures, or water pump issues.

Fuel system problems

LPG conversions can lead to compatibility issues, including fuel line leaks, injector clogs, or improper fuel-air mixtures.

Timing chain or belt wear

Over time, the timing chain or belt can stretch or wear out, causing timing issues and potentially severe engine damage if not addressed.

Exhaust manifold leaks

V8 engines can develop cracks or leaks in the exhaust manifold, leading to increased noise and potential exhaust fumes entering the cabin.

Transmission problems

Older GMC Suburban models can experience transmission issues such as slipping gears, delayed engagement, or complete failure.

Suspension wear

The heavy weight of a 1991 GMC Suburban can cause wear and tear on suspension components like shocks, struts, and bushings.

Rust and corrosion

Older vehicles, particularly those from 1991, are susceptible to rust and corrosion on the body and frame, which can compromise structural integrity.

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