BDFHYK FD505 DG504 ignition coil and AP104 iridium spark plug kit

Ford Escape ignition coil FD505 replacement kit for compatible 2.3L L4 applications

FD505 ignition coil and AP104 spark plug replacement set

BDFHYK ignition coil and iridium spark plug set for compatible Ford Mazda and Mercury vehicles

DG504 FD505 ignition coil replacement with AP104 spark plug reference

Ford Escape ignition coil and spark plug kit with FD505 reference

BDFHYK FD505 ignition coil kit for compatible Ford Escape and Mazda applications

BDFHYK Ignition Coil FD505 & Spark Plug AP104 Mercury Escape C-Max Fusion Transit Connect MKZ 2.0L 2.5L,Set of 4

$39.49

Type Ignition Coil + Spark Plug Set
SKU BDDLZ-BD-05-01804-CK
OE Number For Coil: DG504, 5C1443, E417, 1788328, 521783, 6736010, GN10229, IC517, 4M5Z12029BB, 4M5Z12029BC, 4M5Z12029BA, 4M5Z12029B, 4M5Z12029A, CLS1042, CLS1044, LF1618100A, ZZCA18100, LF1618100, LF1618100B, DG541, IC517SB, 50089, C676, FD505, CFD505, 9212065, C1453
OE Number For Spark plug:AP104

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Technical Specifications

Brand	BDFHYK
Product Type	Ignition Coil + Spark Plug Set
Ignition Coil References	FD505; DG504
Spark Plug Reference	AP104
Spark Plug Type	Iridium
Vehicle Makes	Ford; Mazda; Mercury
Verified Ford Escape Examples	2005, 2007, 2008 2.3L L4; confirm exact fitment

BDFHYK FD505 / DG504 ignition coil and AP104 iridium spark plug kit is listed for compatible Ford, Mazda, and Mercury applications. For a Ford Escape ignition coil replacement, current structured fitment includes selected 2005, 2007, and 2008 Escape 2.3L L4 applications. Confirm the exact year, engine, connector design, removed-part shape, and reference number before installation.

Product Details

Brand: BDFHYK
Product Type: Ignition Coil + Spark Plug Set
Primary Ignition Coil References: FD505 / DG504
Spark Plug Reference: AP104
Vehicle Makes: Ford; Mazda; Mercury

Verified Application Examples

Ford Escape: selected 2005, 2007, 2008 2.3L L4 applications
Ford Focus: selected 2003–2009 2.0L / 2.3L L4 applications
Mazda 3: selected 2004 2.0L / 2.3L L4 applications
Mazda Tribute: selected 2005 and 2008 2.3L L4 applications

Application coverage varies by exact configuration. Match vehicle details and reference numbers before ordering.

OE / Interchange References

Ignition coil comparison references: DG504, 5C1443, E417, 1788328, 521783, 6736010, GN10229, IC517, 4M5Z12029BB, 4M5Z12029BC, 4M5Z12029BA, 4M5Z12029B, 4M5Z12029A, CLS1042, CLS1044, LF1618100A, ZZCA18100, LF1618100, LF1618100B, DG541, IC517SB, 50089, C676, FD505, CFD505, 9212065, C1453.

Spark plug reference: AP104.

Diagnosis Before Replacement

Misfire, rough idle, hard starting, hesitation, or an ignition-related code can involve the ignition coil or spark plug, but those symptoms do not prove either component is the only cause. Check the affected cylinder, plug condition, connectors, wiring, fuel delivery, intake leaks, compression, timing, and other relevant conditions before replacing parts.

Installation Notes

Compare the replacement coil body, connector keying, mounting points, boot profile, and spark-plug specification with the removed components.
Inspect plug wells for oil, moisture, corrosion, or debris.
Do not force a connector or mounting point that does not match.
Use vehicle-specific service information for spark-plug specification, torque, and installation procedure.

Replacement Planning

Replacement scope should follow diagnosis, component condition, service history, labor access, and the requirements of the exact engine. There is no universal mileage interval that requires every ignition coil to be replaced.

After Installation

If a misfire remains, recheck fitment, connector seating, spark-plug installation, and the affected cylinder. Continued diagnosis may be required for wiring, injectors, fuel delivery, intake leaks, compression, timing, or other mechanical conditions.

Difficulty Moderate

Estimated Time 0.5–1 hour

Tools Required

Screwdrivers
Service manual specific to your vehicle
Socket set and ratchet
Wrenches

Pre-Installation Checklist

Stop the engine before disassembling or replacing the ignition coil.
Check the spark plugs and spark plug wires as part of diagnosis.
Keep the installation area clean and dry.
Make sure the ignition coil connections are correct.
Refer to the service manual for your specific vehicle because removal order and connector or fastener details can vary by make and model.
Disconnect the negative battery cable before working on the ignition system.

Installation Steps

Disconnect the battery. Remove the negative battery cable by loosening the clamp bolt with a socket or wrench.
Locate the ignition coils on top of the engine. They may be attached to the engine block or surrounding components.
Disconnect and remove the old ignition coil. Remove the mounting bolts or screws and disconnect the electrical connector(s). The order can vary by vehicle, so follow the vehicle-specific service manual. Remove the old coil once fully disconnected.
If one coil serves multiple spark plugs and has multiple electrical connections, mark or label the connectors so they can be reattached to the correct terminals.
Install the new ignition coil in the reverse order of removal. Secure the mounting bolts or screws and reconnect the electrical connector(s) in the correct positions.
Reconnect the negative battery terminal. Hand-tighten the connection, then tighten the terminal bolt with a socket or wrench. Do not over-tighten.
Close the hood, start the engine with the vehicle in Park, and confirm it starts and idles normally. If it does, test-drive the vehicle.

Post-Installation Verification

Confirm the new ignition coil is securely mounted.
Confirm all electrical connectors are connected to the correct terminals.
Confirm the negative battery terminal is reconnected and tightened sufficiently without over-tightening.
Start the engine in Park and confirm it starts and idles normally.
If idle is normal, test-drive the vehicle and check for remaining misfire or drivability symptoms.

Troubleshooting

Spark plug and wire checks from the manual:
With the engine running, disconnect spark plug wires one at a time and observe engine-speed or roughness changes; the manual states that no significant change can indicate a bad spark plug.
The manual describes checking for spark by holding the end of a disconnected spark plug wire near a metal surface and looking or listening for a spark or cracking sound.
While the engine is cranked, check for spark at each spark plug wire; the manual states that no spark can indicate a dead wire.
Make sure battery, ignition, coil, and spark-plug wire connections are secure. Wiggle connections and retest if a loose connection is suspected.
Keep spark plug ends clean and free of dirt, oil, or grease; clean and retest before replacing a plug.
Inspect wires for cracked, cut, scraped, or burned insulation. Check boots and terminals for damage, corrosion, or poor contact.
Check for corrosion between the boot, spark plug, and ignition coil, and inspect the spark plug for discoloration or damage.
Inspect spring clips and wire retention at the distributor and spark plug ends to make sure connections are held securely.
Ignition coil failure can cause one or more cylinders to misfire, stuttering, sluggishness, and other drivability issues.

BDFHYK Ignition Coil Installation Guide

Q: Will this fit a Ford Escape?

A: Current structured fitment includes selected 2005, 2007, and 2008 Ford Escape 2.3L L4 applications. Confirm the exact vehicle, engine, connector, and reference number before installation.

Q: Which Mazda applications are listed?

A: Current structured fitment includes selected 2004 Mazda 3 2.0L/2.3L applications and selected 2005 and 2008 Mazda Tribute 2.3L applications.

Q: Which ignition coil references can I compare?

A: Current product data lists DG504, 5C1443, E417, 1788328, 521783, 6736010, GN10229, IC517, 4M5Z12029BB, 4M5Z12029BC, 4M5Z12029BA, 4M5Z12029B, 4M5Z12029A, CLS1042, CLS1044, LF1618100A, ZZCA18100, LF1618100, LF1618100B, DG541, IC517SB, 50089, C676, FD505, CFD505, 9212065, and C1453.

Q: What spark plug reference is listed?

A: The current spark plug reference is AP104.

Q: Does a misfire code prove the ignition coil is bad?

A: No. A misfire or ignition-related code is a starting point for diagnosis. Spark plugs, connectors, wiring, fuel delivery, intake leaks, compression, timing, and other conditions can produce similar symptoms.

Q: Should all coils be replaced together?

A: Replacement scope should follow diagnosis, component condition, service history, labor access, and the exact engine. One failed coil does not automatically mean every coil is faulty.

Q: Should the spark plugs be inspected during coil replacement?

A: Yes. Check plug condition, wear, fouling, damage, and the correct specification for the exact engine.

Q: What if oil or moisture is in the spark-plug well?

A: Correct oil, moisture, corrosion, or debris before evaluating the new ignition parts. Contamination can affect the boot and electrical connection.

Q: What if the engine still misfires after installation?

A: Recheck fitment, connector seating, spark-plug installation, and the affected cylinder first. Further diagnosis may be needed for wiring, injectors, fuel delivery, intake leaks, compression, timing, or other mechanical conditions.

Q: Is there a universal mileage interval for ignition coil replacement?

A: No. Use diagnosis, component condition, service history, and vehicle-specific service information.

Q: What should I compare before installing the replacement coil?

A: Compare coil body shape, connector keying, mounting points, boot profile, spark-plug specification, and replacement references with the removed components.

Q: Which torque or plug specification should I use?

A: Use service information for the exact vehicle and engine because installation specifications vary by application.

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.