Automotive Engine Components

Glow Plug Cold-Start Technology.

A key component in diesel engine starting systems, a glow plug provides heat inside the combustion chamber to support ignition during cold-start conditions.

Explore Product Production History

Diesel Engine Starting Technology

Woojin Automotive India Pvt. Ltd.

GLOW PLUG · PRODUCT ILLUSTRATION
Product Overview

Supporting Reliable Diesel Engine Starts

A glow plug is an electrically heated component used in many diesel engines. It helps raise the temperature in the combustion chamber during starting, especially when the engine is cold.

Unlike a spark plug, which creates a spark to ignite an air-fuel mixture in a spark-ignition engine, a glow plug supplies heat to assist diesel combustion during the starting process.

01
Electrical Heating

Converts electrical energy into heat at the heating tip.

02
Cold-Start Assistance

Helps diesel engines start under cold conditions.

03
Engine System Component

Works as part of the engine's starting and combustion system.

Product Functions

The Role of a Glow Plug

Understand the main functions of glow plugs in diesel engine starting systems.

01

Heat Generation

The glow plug's heating element warms when electrical power is supplied, providing a local heat source inside the engine combustion chamber.

02

Cold-Start Support

By helping increase the temperature near the combustion chamber, glow plugs support ignition when cold engine conditions make starting more difficult.

03

Combustion Assistance

In applicable diesel engine systems, glow plugs assist the initial combustion process. Their operating strategy depends on the engine design and control system.

Illustrative heating principle · Not a technical specification
How It Works

From Electrical Energy to Heat

A glow plug operates through a straightforward heating principle. The engine's control system determines when heating is required and controls operation according to the vehicle's design.

01

Electrical Power Is Supplied

The vehicle's glow plug control system supplies electrical power to the component when required.

02

The Heating Tip Warms Up

Electrical resistance in the heating element produces heat, warming the glow plug tip.

03

Cold Starting Is Assisted

The heat helps diesel combustion begin under cold conditions. Some engines also use glow plugs after starting, depending on system design.

Application Overview

Designed for Diesel Starting Systems

Glow plugs are used in diesel engine applications that require supplementary heat to assist starting. The exact component design and compatibility vary by engine platform.

✓ Diesel engine cold-start systems
✓ Engine combustion preheating systems
✓ Engine-specific electronically controlled systems
Woojin Automotive India

Glow Plug Production History

Company-profile milestones relating to the glow plug production line at Woojin Automotive India.

Company Milestones

Part of Our Automotive Manufacturing Journey

The company profile records the establishment of the glow plug production line and its subsequent transfer to headquarters.

January 2019

Glow plug production line established and production started, as recorded in the company profile.

January 2023

Glow plug production discontinued at the India facility; equipment transferred to headquarters, according to the company profile.

Source: Woojin Automotive India Pvt. Ltd. Company Profile, dated 10 July 2026.

Product Information

Frequently Asked Questions

Essential information about glow plug function, operation and its relationship with diesel engine systems.

What is a glow plug?
A glow plug is an electrically heated component used in many diesel engines to assist combustion during cold starting.
How does a glow plug work?
Electrical power heats the glow plug's heating element. The resulting heat helps raise the temperature near the combustion chamber during the starting process.
Is a glow plug the same as a spark plug?
No. A spark plug creates an electrical spark to ignite the air-fuel mixture in a spark-ignition engine. A glow plug supplies heat to assist diesel engine starting.
Does Woojin Automotive India currently manufacture glow plugs?
According to the company profile dated 10 July 2026, glow plug production at the India facility was discontinued in January 2023 and the equipment was transferred to headquarters. The profile does not confirm current production availability from other locations.
Where can I find glow plug specifications?
Part numbers, dimensions, voltage ratings and vehicle compatibility are not provided in the supplied company profile. Please consult the relevant official technical documentation for confirmed specifications.