Ignition Coil + Spark Plugs for GMC Yukon (1996-2000) 5.7L

Direct-Fit Ignition Coil and Spark Plug Tune-Up Kit for 1996-2000 GMC Yukon (GMT400)

What it Does: The direct-fit ignition coil and spark plug kit restores secondary ignition voltage and combustion efficiency on the 1996-2000 GMC Yukon to eliminate misfires, hard starts, and rough idling under load.

The Stock GMC Yukon Secondary Ignition Breakdown

Under-hood thermal cycling on the GMT400 platform degrades the factory epoxy encapsulation inside the stock canister or E-core ignition coil over time. This breakdown causes high-voltage micro-arcing, internal shorting, and reduced dielectric strength. Concurrently, high-mileage copper or platinum plugs in the Vortec 5700 L31 suffer from severe electrode erosion, widening the plug gap past factory specification. The resulting high electrical resistance places excessive demand on aging primary and secondary windings, causing intermittent ignition misfires (DTC P0300 through P0308), unburnt hydrocarbon loading in the catalytic converters, reduced towing capability, and sluggish throttle tip-in.

The Engineering Solution

This comprehensive service kit replaces worn ignition hardware with precision-wound internal copper primaries and high-grade silicon magnetic steel laminations engineered to deliver sustained 35,000+ volt output. The replacement coil utilizes high-dielectric epoxy potting that resists thermal degradation and moisture intrusion. Paired with eight factory-gapped spark plugs featuring wear-resistant nickel-alloy/copper core construction, this kit maintains optimal spark kernel energy across all eight cylinders. Replacing the coil and plugs simultaneously restores precise flame propagation inside the combustion chambers, lowering emissions and maintaining optimal dwell time under heavy load conditions without electrical cross-fire.

Technical Specifications

Compatibility

• 1996 GMC Yukon 5.7L V8 (Vortec L31)
• 1997 GMC Yukon 5.7L V8 (Vortec L31)
• 1998 GMC Yukon 5.7L V8 (Vortec L31)
• 1999 GMC Yukon 5.7L V8 (Vortec L31)
• 2000 GMC Yukon Denali 5.7L V8 (Vortec L31)

Frequently Asked Questions

Does this fit the GMT400 Yukon?

Yes, this is a direct fit for the 1996-2000 GMC Yukon equipped with the Vortec 5700 L31 engine.

Should I replace spark plug wires when installing this kit?

While wires are not included, inspecting or renewing high-resistance secondary ignition leads is strongly recommended to ensure consistent voltage delivery to all eight plugs.

The GMC Heavy-Duty Standard

Built for rugged utility and demanding payload duty, this ignition assembly delivers the sustained spark delivery needed to preserve low-end pulling torque and long-range reliability on heavy-duty hauling platforms.