Ignition Coil + Spark Plugs for Cadillac Eldorado Seville (1997-1999) 4.6L

Direct-Fit Ignition Coil & Spark Plug Kit for 1997-1999 Cadillac Eldorado, Seville (E-Body / K-Body)

What it Does: The ignition coil and spark plug service kit restores high-voltage secondary ignition output on 1997-1999 Cadillac Eldorado and Seville models to eliminate cylinder misfires, rough idle, and unburned fuel dumping into catalytic converters.

The Stock Cadillac Eldorado, Seville Ignition Breakdown

The 4.6L Northstar L37 / LD8 engine operates in a compact, thermally saturated transverse engine bay. Over extended heat cycles, factory waste-spark coil packs suffer internal dielectric breakdown of the secondary windings, tracking failure, and casing micro-fractures. In a waste-spark setup where one pack fires two companion cylinders simultaneously, degradation in a single coil pack immediately induces multi-cylinder misfires under high-load acceleration. Compounding this, aged plugs suffer spark erosion, increasing the required firing voltage across the electrode gap beyond what degraded coils can bridge.

The Engineering Solution

This replacement ignition kit pairs calibrated high-dielectric epoxy-encapsulated coil packs with genuine NGK spark plugs engineered to factory thermal ranges. Built to match OEM secondary impedance and primary saturation times, these coils resist high-voltage flashover under extended heat soak. Combined with NGK plugs featuring trivalent metal plating to halt anti-seizing and corrosion, this kit guarantees consistent flame-front propagation, stabilizes idle RPM, and eliminates load-dependent misfire codes.

What's Included

• 3 Ignition Coils
• 6 NGK Spark Plugs

Technical Specifications

Compatibility

• 1997-1999 Cadillac Eldorado 4.6L
• 1997-1999 Cadillac Seville 4.6L

Frequently Asked Questions & Fitment Warnings

Does this fit the E-Body / K-Body Eldorado, Seville?

Yes, this is a direct fit for the 1997-1999 Cadillac Eldorado and Seville equipped with the 4.6L Northstar engine; verify your coil connector style before purchasing as this is not a universal kit.

Are spark plug wires included with this kit?

No, secondary ignition wires are not included and must be inspected or purchased separately if deteriorated.

The Cadillac Precision Standard

Engineered to deliver factory-level spark output without triggering nuisance secondary circuit DTCs, preserving the smooth, high-output luxury power delivery expected from Cadillac V8 engineering.