ECCPP Ignition Coil and Iridium Spark Plug Kit for Buick Regal & Cadillac ATS 2.0L–2.5L — Set of 4, OE-fit Reliable Spark

This ECCPP kit pairs four ignition coils with four iridium spark plugs to restore reliable spark and engine responsiveness for select Buick and Cadillac 2.0L–2.5L engines.

If your vehicle is showing misfires, rough idle, or a check engine light after many miles, replacing ignition coils and spark plugs as a matched set often returns smooth performance faster than swapping parts individually. ECCPP engineered these components to meet or surpass OE specifications, using high-conductivity materials and corrosion-resistant connections. The set is designed to fit specific Buick Regal and Cadillac ATS model years and several original equipment part numbers for a straightforward replacement.

Which vehicles and part numbers does this set fit?

This kit is intended for certain Buick Regal and Cadillac ATS models with 2.0L or 2.5L four-cylinder engines. It cross-references multiple OEM part numbers so you can confirm compatibility before purchasing.

• Fits: Buick Regal 2014 2.0L L4, Regal Sportback 2018 2.0L L4, Regal Tour 2018 2.0L L4;
• Fits: Cadillac ATS 2013–2016 2.5L L4;
• Replaces OEM references: UF680, 12652405, 12654078, 12687140, 25202791 and additional cross numbers;
• Verify your VIN or existing part numbers to ensure a correct match.

How will replacing both coils and plugs together help performance?

Coils and plugs wear on different schedules but both affect combustion quality. Installing a matched coil-and-plug set helps ensure even spark delivery across cylinders, which reduces misfires, restores throttle response, and stabilizes idle.

• ECCPP coils deliver about 15% more available spark energy versus typical OE output;
• Iridium plugs preserve consistent firing with a long service life and stable gap retention;
• Together they reduce the likelihood of intermittent misfires and CEL triggers;
• Best practice: replace coils and plugs at the same time for balanced engine operation.

What construction and materials make this kit durable?

ECCPP uses materials chosen for electrical stability and environmental resistance. The coils have high dielectric epoxy and corrosion-resistant terminals, while the spark plugs employ iridium tips for reliable ignition and extended life.

• High-conductivity copper wiring inside coils for efficient energy transfer;
• Dielectric epoxy seals to resist heat and moisture intrusion;
• Corrosion-resistant connections for dependable long-term contact;
• Precision-ground iridium electrodes to maintain a stable spark gap.

How difficult is installation and what should I check during fitment?

Installation is straightforward for anyone comfortable with basic engine maintenance, but follow safety precautions. Double-check plug gaps, torque specs, and connector seating; improper installation can lead to poor performance or damage.

• Recommended tools: torque wrench, socket set, anti-seize (if specified by manual);
• Confirm OEM torque values for spark plugs and secure coil harness connectors fully;
• Inspect ignition boot seals and replace if cracked or oil-soaked;
• Clear codes and test-drive to confirm misfires and drivability are resolved.

Who is this for: This ECCPP UF680 & 94489 kit is for owners and professional mechanics replacing worn ignition components on compatible Buick Regal and Cadillac ATS four-cylinder engines. It's suited to drivers seeking an OE-fit replacement with upgraded spark energy and long-life iridium plugs to restore engine smoothness, fuel efficiency balance, and reliable starting. Always verify vehicle compatibility by checking existing part numbers or your VIN before ordering.