BDFHYK UF543 ignition coil and SP541 double-platinum spark plug kit for 4.6L V8

UF543 coil pack and SP541 spark plugs for Buick Lucerne 4.6L Northstar V8

8 ignition coils and 8 SP541 double-platinum plugs for Cadillac DTS 4.6L V8

UF543 ignition coil kit for Cadillac STS SRX XLR 4.6L Northstar V8

12597745 UF543 replacement ignition coil and SP541 spark plug set

BDFHYK 4.6L Northstar V8 ignition coils and double-platinum spark plugs

UF543 SP541 ignition service kit for Buick Lucerne and Cadillac 4.6L V8

BDFHYK 8-coil 8-plug UF543 SP541 kit for GM 4.6L Northstar V8 applications

BDFHYK 8 Ignition Coil UF543 and 8 Iridium Spark Plug SP541 For Buick 2007-2011 Lucerne, Cadillac 2007-2011 DTS

$145.99

Type Ignition Coil + Spark Plug Set
SKU BDDLZ-BD-05-07377-8-CK
OE Number For Coil: UF543, 12597745, 42597745
OE Number For Spark plug:SP541

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Technical Specifications

Brand	BDFHYK
Product Type	Ignition Coil + Spark Plug Kit
Primary Coil Reference	UF543
Spark Plug Reference	SP541 / SP541X
Package Quantity	8 Ignition Coils + 8 Spark Plugs
Includes	8 Ignition Coils + 8 SP541-Reference Double-Platinum Spark Plugs
Ignition Coil Construction	Silicon steel core; high-temperature rubber; varnished copper wire
Spark Plug Construction	Double-platinum spark plug reference with ceramic insulator
Engine	4.6L Northstar V8
Listed Vehicle Fitment	2007-2011 Buick Lucerne; 2007-2011 Cadillac DTS; 2007-2010 Cadillac STS; 2007-2009 Cadillac SRX; 2007-2009 Cadillac XLR — listed 4.6L V8 applications
OE / Interchange References	UF543, 12597745, 42597745; spark plug SP541 / SP541X
Common Service Scenarios	Misfire, rough idle, hard starting or hesitation after diagnosis confirms worn ignition components
Fitment Checks	Confirm exact year/model and 4.6L Northstar V8; compare original coil connector/body/boot and UF543/12597745 references; confirm SP541/SP541X separately
Installation Checks	Follow exact Buick or Cadillac service information for spark plug gap and torque; inspect plug wells, boots and electrical connectors
Important Note	SP541 / SP541X is treated as a double-platinum spark plug reference for this listing. Confirm the exact supplied plug and service application before installation.

UF543 Ignition Coil & SP541 Double-Platinum Spark Plug Kit for GM 4.6L Northstar V8

Misfire, rough idle, hard starting or hesitation can involve worn ignition components, but similar symptoms can also come from wiring, injectors, fuel delivery, intake leaks, sensors or mechanical faults. This BDFHYK UF543 ignition coil and SP541 / SP541X double-platinum spark plug kit contains eight coils and eight plugs for listed Buick and Cadillac 4.6L Northstar V8 applications. Confirm the exact year, model, engine and original ignition references before ordering.

UF543 / SP541 4.6L Northstar V8 Vehicle Fitment

Buick Lucerne 2007-2011 — listed 4.6L V8 applications
Cadillac DTS 2007-2011 — listed 4.6L V8 applications
Cadillac STS 2007-2010 — listed 4.6L V8 applications; confirm exact engine before ordering
Cadillac SRX 2007-2009 — listed 4.6L V8 applications
Cadillac XLR 2007-2009 — listed 4.6L V8 applications

What Is Included in the UF543 / SP541 Kit?

8 UF543-style ignition coils
8 SP541 / SP541X double-platinum spark plugs

UF543 Ignition Coil Reference Numbers

UF543, 12597745 and 42597745 are listed coil references for this kit. Compare the original coil connector, body, mounting and printed references before ordering.

SP541 Spark Plug Reference & Material

The SP541 family is a double-platinum spark plug reference. Confirm the exact SP541 / SP541X service application for the vehicle and compare the supplied plug with the original plug before installation.

Common Ignition Service Scenarios

Misfire or unstable idle after diagnostic inspection
Hard starting or hesitation with worn ignition components
Eight-cylinder ignition service when coil and spark plug condition supports replacement

How to Confirm UF543 & SP541 Fitment Before Ordering

Confirm the exact listed year, model and 4.6L Northstar V8 engine.
Compare the original coil connector, body, mounting, boot profile and printed references.
Confirm UF543 / 12597745 or another listed coil reference.
Confirm SP541 / SP541X for the exact engine application.
Verify an eight-position V8 ignition service quantity.
Follow exact Buick or Cadillac service information for spark plug gap and torque.

Diagnostic note: A misfire DTC does not prove an ignition coil has failed. Inspect wiring, connectors, injectors, fuel delivery, intake or vacuum leaks, sensors, compression and mechanical timing as applicable.

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: What is included in the UF543 and SP541 kit?
A: The kit includes 8 UF543-style ignition coils and 8 SP541 / SP541X double-platinum spark plugs.

Q: Which vehicles are listed for this kit?
A: Listed applications include 2007-2011 Buick Lucerne, 2007-2011 Cadillac DTS, 2007-2010 Cadillac STS, and 2007-2009 Cadillac SRX and XLR with the listed 4.6L V8.

Q: Which engine is this kit intended for?
A: This listing targets the listed 4.6L Northstar V8 applications. Confirm engine displacement and original ignition parts before ordering.

Q: What ignition coil references should I compare?
A: Compare UF543, 12597745 and 42597745 with the original ignition coil and connector configuration.

Q: Is SP541 an iridium spark plug?
A: The SP541 / SP541X family is treated here as a double-platinum spark plug reference. Confirm the exact plug supplied and the vehicle service application before installation.

Q: Does a misfire code prove a UF543 coil is defective?
A: No. Wiring, connectors, injectors, fuel delivery, intake leaks, sensors, compression and mechanical timing can also cause misfire symptoms.

Q: Should all eight ignition coils and spark plugs be replaced together?
A: A complete V8 set can be appropriate when inspection and maintenance history support full-set service, but diagnosis should determine whether the coils, plugs or another system requires attention.

Q: What spark plug gap and torque should be used?
A: Follow the exact Buick or Cadillac service information for the specific 4.6L V8 application. Do not use a universal gap or torque value.

Q: How should fitment be confirmed before ordering?
A: Confirm the exact year, model and 4.6L V8, then compare the original coil connector, body, boot, mounting and UF543/12597745 references. Confirm SP541/SP541X separately.

Q: Does this kit fit every Lucerne or Cadillac in the listed years?
A: No. The model names were offered with different engines and configurations. This listing is for the specified 4.6L V8 applications only.

Q: Can replacing this kit guarantee a check-engine light will turn off?
A: No. A check-engine light can result from ignition, fuel, air, emissions, sensor or mechanical faults, so the underlying DTC and system condition should be diagnosed first.

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)

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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.