2GTHC39N2L1510188

The 1990 GMC Sierra is a robust pickup truck featuring a powerful 7.4L V8 engine with throttle body fuel injection. Built in Oshawa, Ontario, this 1-ton nominal truck offers a hydraulic brake system and 4x2 drive type. Perfect for heavy-duty tasks, it falls under the Class 2H weight rating.

Decoded VIN:

Make

GMC

Manufacturer Name

GENERAL MOTORS LLC

Model

Sierra

Model Year

1990

Plant City

OSHAWA TRUCK

Vehicle Type

TRUCK

Plant Country

CANADA

Plant Company Name

NA-Canada - Truck

Plant State

ONTARIO

Trim2

1 ton nominal

Series2

Conventional Cab

Body Class

Pickup

Gross Vehicle Weight Rating From

Class 2H: 9,001 - 10,000 lb (4,082 - 4,536 kg)

Cab Type

Extra/Super/Quad/Double/King/Extended

Drive Type

4x2

Brake System Type

Hydraulic

Engine Number of Cylinders

Displacement (CC)

7400.0

Displacement (CI)

451.57570630101

Displacement (L)

7.4

Fuel Type - Primary

Gasoline

Engine Configuration

V-Shaped

Fuel Delivery / Fuel Injection Type

Throttle Body Fuel Injection (TBI)

Engine Manufacturer

CPC

Most common problems:

Brake fluid leaks

Hydraulic brake systems can develop leaks in the brake lines, master cylinder, or calipers, leading to decreased braking efficiency.

Brake master cylinder failure

The master cylinder can wear out over time, causing a spongy brake pedal or complete brake failure.

Brake caliper issues

Calipers can seize or leak, affecting braking performance and causing uneven brake pad wear.

Brake pad and rotor wear

Regular wear and tear can cause brake pads and rotors to become worn, leading to decreased braking ability and potential safety hazards.

Misfiring cylinders

V8 engines can experience misfires due to ignition system problems, fuel delivery issues, or mechanical faults.

Oil leaks

Older V8 engines, like the one in the 1990 GMC Sierra, are prone to oil leaks from gaskets, seals, and valve covers.

Overheating

V-shaped engines can suffer from cooling system problems, such as radiator clogs, thermostat failures, or water pump issues, leading to overheating.

Timing chain or belt wear

Over time, the timing components can wear out, potentially leading to engine performance issues or catastrophic engine damage if they fail.

Fuel system problems

Issues with the fuel injectors, fuel pump, or fuel filter can cause poor engine performance, stalling, or starting difficulties.

Vacuum leaks

Vacuum leaks can lead to rough idling, poor acceleration, and reduced fuel efficiency in V8 engines.

Exhaust manifold cracks

V8 engines are prone to developing cracks in the exhaust manifolds, leading to exhaust leaks and increased engine noise.

Carbon buildup

Older engines can accumulate carbon deposits on valves, pistons, and combustion chambers, leading to reduced performance and efficiency.

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