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BDFHYK 8 Ignition Coil FD506 and 8 Iridium Spark Plug 4503 for 2000-2006 Lincoln LS,2002-2005 Ford Thunderbird 3.9L V8

$86.99

Type Ignition Coil + Spark Plug Set
SKU BDDLZ-BD-05-11352-CK
OE Number For Coil: FD506, FD506T, FD-506, DG515, DG509, DG529, C1234, 1W4Z12029BA, 2W4Z12029B, 2W4Z12029BA, 2W4Z12029BC, 2W4Z12029BD, AJ81373, AJ82545, AJ86468, LF1618100B, XR827823, XW4U12A366BB, XW4X12029BA, XW4Z12029BA
OE Number For Spark plug:4503

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Technical Specifications

Brand	BDFHYK
Model	Professional FD506 Ignition Coil & 4503 Spark Plug Set
Package Includes	8 PCS Ignition Coils + 8 PCS Spark Plugs (Complete Tune-Up Kit)
Efficiency Rating	+20% Ignition Power Boost (Ensures stable ignition and eliminates misfires)
Connector Type	2-Pin (Direct Plug-and-Play design for 3.9L V8 engines)
Electrode Material	Premium Iridium (High melting point for superior durability and spark)
Manufacturing Process	360-degree Laser Welding Technology (Secures Iridium Electrode for long service life)
Internal Components	High-Permeability Magnetic Core & Dual-Winding (Primary/Secondary) System
Insulation Protection	Flexible High-temp Silicone & Special Ceramic (Thermal and Shock Resistance)
Ignition Coil OE Reference	FD506, FD506T, FD-506, DG515, DG509, DG529, 1W4Z12029BA, 2W4Z12029B, XR827823, XW4U12A366BB
Interchange Part Numbers	C1234, AJ8173, AJ82545, AJ86468, LF1618100B, XW4X12029BA, 2W4Z12029BC, 2W4Z12029BD
Spark Plug OE Number	4503 (Premium Iridium Electrode for fuller combustion)
Lincoln Fitment	Lincoln LS (2000–2006 3.9L V8 Models)
Ford Fitment	Ford Thunderbird (2002–2005 3.9L V8 Models)
Primary Functions	Resolve Engine Jitter, Prevent Misfires, and Reduce Carbon Deposits
Engine Compatibility	3.9L V8 Engines (Ford / Lincoln AJ-V8 Series ONLY)
Critical Note	Please verify your 2-Pin connector and OE number to ensure a perfect fit before purchasing.

Restore your vehicle's factory performance with the BDFHYK ignition coil and spark plug set. Specifically engineered for the 3.9L V8 engines found in the Lincoln LS and Ford Thunderbird, this ignition coil kit addresses common V8 ignition failures such as rough idling, acceleration hesitation, and power loss.

Vehicle Compatibility & OE Cross-Reference

This LS ignition set is a Direct OE Replacement designed for a perfect fit. Please verify your 2 Pins connector and OE number before purchase:

Core OE Numbers: FD506, FD506T, FD-506, DG515, DG509, DG529.
Interchange Parts: 1W4Z12029BA, 2W4Z12029B, 2W4Z12029BA, AJ8173, AJ86468, XR827823, XW4U12A366BB.
Spark Plug OE: 4503.

Brand	Model	Years	Engine
Lincoln	LS	2000–2006	3.9L V8
Ford	Thunderbird	2002–2005	3.9L V8

Why BDFHYK is the Top Choice for LS Ignition Maintenance

Advanced Internal Construction: Every BDFHYK LS ignition coil features a precision-engineered Secondary Coil and Primary Coil system wrapped around a high-permeability Magnetic Core. This dual-winding architecture maximizes energy transfer, delivering a high-voltage spark that Boosts Power by 20%.
Thermal & Shock Resilience: The 3.9L V8 engines generate significant engine bay heat. Our LS ignition coils are protected by Flexible High-temp Silicone boots and a rugged outer shell designed for superior Shock Resistance. This prevents the electrical leakage and boot cracking common in standard coils ignition.
360-degree Laser-Welded Iridium Spark Plugs: Our iridium spark plugs utilize 360° laser welding technology to secure the Iridium Electrode. Combined with Special Ceramic insulation, these spark plugs prevent flashover and ensure consistent firing even under extreme pressure, effectively helping to Resolve Jitter.
Carbon Deposit Prevention: A stronger spark means fuller combustion. By upgrading to the BDFHYK LS ignition coil kit, you transition from 'Serious Carbon Deposits' to 'Basically No Carbon Deposits,' protecting your valves and extending engine life.

Application Scenarios: Who is this for?

The Daily Commuter: If your 'Check Engine' light is on due to misfire codes (P0300-P0308), this LS ignition coil set provides a budget-friendly, professional-grade fix to get you back on the road safely.
Classic Car Restoration: For enthusiasts maintaining the 2000–2006 Lincoln LS or 2002–2005 Ford Thunderbird, using the FD506 specific kit preserves the original driving dynamics of these iconic V8s.
DIY Mechanics: Designed for an Easy to Install experience, the 2 Pins connector ensures a plug-and-play fit. You can restore your LS ignition system in five simple steps, saving hundreds on dealership labor costs.

Installation Quick-Start

Step 1: Disconnect the battery.
Step 2: Locate and remove old LS ignition coils.
Step 3: Install the new BDFHYK ignition coil and spark plugs.
Step 4: Reconnect and test.

The BDFHYK Advantage: Restore Your Drive

Old, weak spark plugs and failing LS ignition coils lead to unburnt fuel and heavy carbon buildup. As shown in our technical comparisons, the BDFHYK LS ignition coil delivers a consistent, high-energy spark that cleans up your combustion cycle.

Upgrade to the BDFHYK LS ignition coil kit today and experience a smoother, more powerful ride!

Q: How to tell if an LS ignition coil is bad?

A: Common symptoms include a rough idle, noticeable 'stuttering' during acceleration, decreased fuel economy, and the illumination of the Check Engine Light. You may see misfire codes such as P0300 (Random) or P0301-P0308 (Specific Cylinders) when using an OBD-II scanner.

Q: How long do BDFHYK LS ignition coils last?

A: Typically, high-quality ignition coils last between 60,000 to 80,000 miles. However, because the 3.9L V8 engine bay runs very hot, we recommend inspecting them every 50,000 miles to ensure optimal firing and fuel efficiency.

Q: What is the most common cause of no spark on a 3.9L V8?
A: Beyond a failed coil, the most common culprit is often a cracked coil boot or oil contamination in the spark plug well. If the coil cannot jump the gap due to insulation failure, the cylinder will experience a 'no spark' condition.

Q: Are all LS ignition coil harnesses the same?

A: No. While many Ford/Lincoln coils look similar, the connector type (2-Pin vs 3-Pin) and the mounting bracket offset vary. The BDFHYK FD506 is specifically designed with the correct 2-Pin orientation for the 3.9L V8 AJ-V8 engine series.

Q: Why is there oil on my spark plugs when I remove the coils?

A: This is a classic issue for Lincoln LS and Thunderbird V8s. It indicates a failing Valve Cover Gasket (VCG). Oil leaks into the spark plug wells and shorts out the coils. We strongly recommend checking your gaskets when installing the BDFHYK ignition coil kit.

Q: Can I replace just one faulty coil instead of the whole set?

A: While you can replace a single coil, it is highly recommended to replace all 8 as a complete tune-up kit. Ignition coils usually have a similar lifespan; when one fails, others often follow shortly after. A full set ensures balanced engine harmonics and performance.

Q: Does the BDFHYK kit include Iridium spark plugs?

A: Yes. Our kit features 4503 Iridium spark plugs. Iridium is preferred for the 3.9L V8 because it has a higher melting point and better conductivity than platinum, effectively resolving jitter and providing a more stable spark.

Q: What is the recommended gap for the spark plugs in this kit?

A: Our 4503 spark plugs come with a factory-preset gap. However, for the Lincoln LS 3.9L V8, always verify the gap (typically 1.0mm to 1.1mm) according to your vehicle's emissions sticker before installation to ensure the best LS ignition performance.

Q: Will these coils help with my 'Misfire under load' issue?

A: Yes. Misfires that only happen during heavy acceleration (under load) are usually caused by weak coils that can no longer produce enough voltage to jump the gap under high cylinder pressure. The +20% power boost of BDFHYK coils is specifically designed to eliminate this.

Q: Is this ignition coil kit 'Plug-and-Play' for a DIY install?

A: Absolutely. The BDFHYK LS ignition coil is a direct OE replacement. No splicing or modification to the wiring harness is required. With basic hand tools, most owners can complete the installation in about 60-90 minutes.

Returns & Refunds

We accept returns within 30 days of delivery for eligible items. If the product is unused and in original condition, you may request a return according to our refund policy. Full policy details: View Refund Policy . We recommend contacting our support team before initiating a return to ensure the fastest resolution.

Customer Support

If you purchased the wrong part, received an incompatible item, or need installation assistance, please contact us directly.

Email: service@bdfhyk.com

Business Hours:

Mon–Fri 9:00–18:00 (GMT+8)

Mon–Fri 19:00–04:00 (UTC−6 / CST)

Manufacturing Standards

Direct Factory Supply, Cost Saving
Integrated R&D, production, and warehousing. Eliminate middleman markups: same quality at lower prices, superior quality at same prices.

Precision Inspection, Commitment to Excellence
Rigorous inspection process, international certification standards. Each product includes individual inspection.

Before vs After Replacement

Replacing worn ignition coils and spark plugs helps restore stable ignition and smoother engine performance.

BEFORE

Rough Idle & Engine Vibration Noticeable engine shaking while idling. Irregular exhaust flow may indicate unstable ignition performance.

AFTER

Fast Start & Stable Idle IMore consistent spark delivery reduces misfires and stabilizes idle speed.

BEFORE

Sluggish Acceleration Weak throttle response at lower RPM. Vehicle may feel underpowered.

AFTER

Enhanced Power Response Improved throttle response and smoother acceleration

BEFORE

Increased Fuel Consumption Poor combustion can lead to higher fuel usage.

AFTER

Improved Fuel Efficiency Optimized ignition supports more efficient combustion.

Performance improvements may vary depending on vehicle condition.