Toyota Diesel 1N 1NT 2L 2LT 2LTE 2LTEH 3L OEM Heater Glow Plug Set 19850-54090

Product Overview

Genuine OEM Toyota Glow Plug compatible with 1984-2006 Toyota Hilux, Hiace, 4Runner, Land Cruiser, and Dyna models with 1N, 1N-T, 2L, 2L-T, 2L-TE, 2L-THE, and 3L diesel engines. This essential ignition component ensures reliable cold-weather starting and smooth diesel operation. This OEM glow plug delivers consistent performance and long-lasting durability in demanding conditions.

OEM Part Number(s):

• 19850-54090 (primary)
• 19850-54031 (superseded)
• 19850-54030 (superseded)
• 19850-54050 (related application)

 

Key Features & Benefits

• Perfect Fit: Engineered specifically for Toyota 1N, 1N-T, 2L, 2L-T, 2L-TE, 2L-THE, and 3L diesel engines 
• Quality Assurance: Metal glow plug construction with high-quality coating for superior corrosion resistance
• Performance: Rapid heat-up time ensures reliable cold starts and reduced emissions during warm-up
• Easy Installation: Direct OEM replacement with standard M10x1.25 thread - beginner to intermediate installation

 

Technical Specifications

Part Type: Diesel Engine Glow Plug (Heater Plug)
Material: Metal construction with corrosion-resistant coating
Engine Compatibility: 1N (1.5L), 1N-T (1.5L Turbo), 2L (2.4L), 2L-T (2.4L Turbo), 2L-TE (2.4L Turbo EFI), 2L-THE (2.4L), 3L (2.8L)
Voltage: 11V (operates in 12V systems)
Thread Size: M10 x 1.25mm
Overall Length: 90.4mm
Heat-up Time: Approximately 7 seconds
Spanner Size: 12mm
Connector Type: M4
Tightening Torque: 10-18 Nm (7-13 ft-lbs)

Fitment

Year	Model	Engine
1984-2006	Toyota Hilux / Pickup	2L, 2L-T, 3L diesel engines
1988-2001	Toyota 4Runner / Hilux Surf	2L-T, 2L-TE turbo diesel
1989-2006	Toyota Hiace / Regius Ace	2L, 2L-T, 2L-TE, 3L diesel engines
1987-1996	Toyota Hiace Truck	2L, 3L diesel engines
1984-1996	Toyota Land Cruiser (70 Series)	2L-T, 2L-TE, 3L diesel engines
1987-2001	Toyota Dyna / ToyoAce	2L, 3L diesel engines
1988-1992	Toyota Chaser	2L, 2L-T diesel engines
1988-1993	Toyota Cressida / Wagon	2L diesel engines
1988-1992	Toyota Cresta	2L, 2L-T diesel engines
1990-1994	Toyota Corolla / Corsa / Tercel	1N-T diesel engines
1987-2001	Toyota Crown / Majesta / Comfort	2L, 2L-T, 2L-THE diesel engines
1988-1992	Toyota Mark II	2L, 2L-T diesel engines
1995-2002	Toyota Grand Hiace / Granvia	3L diesel engines
1996-2002	Toyota Innova / Kijang / Revo	2L-TE diesel engines

Important: This glow plug (19850-54090) is specifically designed for cylinder head part number 11101-54121, which is used in 1N, 1N-T, 2L, 2L-T, 2L-TE, 2L-THE, and 3L engines. The 5L and 5L-E engines use a different glow plug (19850-54120). Verify engine code and cylinder head part number before purchase. Glow plugs should be replaced as a complete set of 4 for optimal performance.

Installation & Maintenance

Installation Difficulty: Beginner to Intermediate
Tools Required: 12mm socket or wrench, torque wrench, anti-seize compound, wire brush
Professional Installation: Optional - DIY-friendly for mechanically inclined owners

Maintenance Tips:

• Always replace glow plugs as a complete set of 4 to ensure even performance
• Clean cylinder head threads with wire brush and apply anti-seize compound before installation
• Use proper torque specifications (10-18 Nm) to prevent thread damage or glow plug breakage
• Inspect glow plug relay and timer system when replacing glow plugs for comprehensive maintenance

 

Frequently Asked Questions

Q: How many glow plugs do I need for my Toyota diesel engine?
A: Toyota 2L, 3L, and 5L diesel engines use 4 glow plugs (one per cylinder). We recommend replacing all 4 glow plugs simultaneously for optimal cold-start performance and to prevent uneven wear.

Q: What's the difference between 11V and 12V glow plugs?
A: This 11V glow plug is designed to operate in 12V electrical systems. The slightly lower voltage rating provides optimal heat-up time and longevity. Early Toyota diesels used 6V or 7V glow plugs with different relay systems. 

Q: How do I know when my glow plugs need replacement?
A: Common symptoms include difficult cold starts, extended cranking time, rough idle when cold, white smoke during warm-up, and illuminated glow plug warning light on the dashboard.

Related Toyota Parts You May Need

• Glow Plug Relay - Controls glow plug operation and timing for optimal cold starts
• Glow Plug Timer - Manages pre-heat and post-glow cycles for proper diesel operation
• Glow Plug Insulator Kit - Prevents electrical shorting and ensures proper glow plug function
• Fuel Filter - Replace during glow plug service for comprehensive diesel system maintenance

 

Common Symptoms of Glow Plug Failure

• Extended cranking time or difficulty starting in cold weather conditions
• Rough idle and engine misfiring during initial warm-up period
• White or gray smoke from exhaust during cold starts
• Glow plug warning light remains illuminated on dashboard
• Increased emissions and reduced fuel efficiency during warm-up phase

 

Why Replace Your Toyota Diesel Glow Plugs

Essential for Diesel Engine Operation: Glow plugs are critical components in diesel engines, especially in cold climates. Unlike gasoline engines that use spark plugs for ignition, diesel engines rely on compression heat and glow plugs to achieve the temperatures necessary for fuel combustion during cold starts.

Failed or worn glow plugs don't just make cold starts difficult - they increase engine wear, elevate emissions, and can lead to incomplete combustion that damages injectors and other components. The relatively small investment in genuine OEM glow plugs protects your engine and ensures reliable operation in all weather conditions.

The 2L-T and 2L-TE turbocharged variants became particularly renowned for robust construction and ability to handle significant workloads in commercial, agricultural, and off-road applications. Proper maintenance of the glow plug system is essential to preserve the cold-start performance and longevity that made these engines legendary.

Don't compromise on this critical ignition component. Genuine Toyota OEM glow plugs are engineered to precise specifications with proper heat-up times, correct voltage characteristics, and durable construction that withstands the harsh combustion chamber environment. Aftermarket alternatives may seem economical but often fail prematurely or provide inconsistent performance.

Replace your worn glow plugs with genuine Toyota OEM parts and experience the reliable cold-start performance your legendary L-series diesel engine was designed to deliver.