Ignition Coil + Spark Plugs for Lincoln Mark LT (2006-2008) 5.4L

Direct-Replacement Ignition Coil and Spark Plug Kit for 2006-2008 Lincoln Mark LT (P221)

What it Does: The Ignition Coil and Spark Plug Kit replaces worn secondary ignition hardware on the 2006-2008 Lincoln Mark LT to eliminate misfires, stabilize engine idle, and restore peak combustion efficiency under load.

The Stock Lincoln Mark LT Ignition Breakdown

Under continuous thermal stress inside the P221 engine bay, factory FD508 and DG511 coil packs suffer dielectric breakdown. Heat cycles crack the internal epoxy resin, allowing secondary voltage to leak to ground rather than reaching the cylinder. Coupled with carbon-eroded electrode gaps on aging SP515 spark plugs, ignition resistance spikes. This overtaxes the primary winding circuits, triggering low-RPM hesitation, erratic idle, reduced fuel economy, and persistent P0300 through P0308 diagnostic trouble codes during heavy payload demands.

The Engineering Solution

This comprehensive tune-up kit features eight high-output coil-on-plug (COP) units wound with high-conductivity copper wire and laminated magnetic steel cores to maximize spark energy output. High-dielectric silicone boots isolate peak secondary voltage to prevent arcing and flashover. Paired with fine-wire platinum spark plugs, the assembly minimizes quenching, stabilizes flame-front propagation, and resists erosion under high combustion chamber temperatures without requiring recalibration or harness modification.

What's Included

• 8 Ignition Coils
• 8 Platinum Spark Plugs

Technical Specifications

Compatibility

• 2006 Lincoln Mark LT Base 5.4L V8
• 2007 Lincoln Mark LT Base 5.4L V8
• 2008 Lincoln Mark LT Base 5.4L V8

Frequently Asked Questions & Fitment Warnings

Does this fit the P221 Mark LT?

Yes, this is a direct fit for the 2006-2008 Lincoln Mark LT equipped with the 5.4L Triton 3V engine. Confirm your vehicle does not use earlier 2V coil configurations or alternate boot lengths prior to installation.

What are the critical torque and installation specs?

Torque all spark plugs to factory spec on a completely cold cylinder head, apply dielectric grease to internal boot terminals, and do not overtighten coil retention bolts.

The Lincoln Truck Standard

Engineered for full-size luxury utility, these components deliver the ignition durability and spark energy required to maintain smooth power delivery under heavy towing and sustained grade-climbing.