Ignition Coil and Iridium Spark Plugs for Audi S8 (2016-2018) 4.0L

Direct-Replacement Ignition Coil and Iridium Spark Plug Kit for 2016-2018 Audi S8

What it Does: The ignition coil and iridium spark plug kit restores factory combustion efficiency on the 2016-2018 Audi S8 by eliminating high-boost spark blowout, secondary winding breakdown, and cylinder misfires.

The Stock Audi S8 Thermal Saturation Weakness

The "hot-vee" twin-turbo layout of the EA824 4.0L TFSI engine creates extreme under-hood thermal saturation directly adjacent to the cylinder heads. Over repetitive heat cycles, factory coil boots harden, internal dielectric epoxy degrades, and high cylinder pressures accelerate electrode erosion on standard plugs. This leads to intermittent misfires under heavy load, hesitation, erratic idle stability, and unburnt fuel entering the catalytic converters.

The Engineering Solution

This comprehensive ignition service kit supplies eight high-insulation pencil coils paired with fine-wire iridium-tipped spark plugs built to withstand sustained thermal stress. The iridium center electrode provides superior arc stability and wear resistance under high boost without expanding the spark gap over time. Reinforced silicone boots prevent voltage arcing to the plug tubes, directly replacing cross-references UF766, GN10334, and 307134160 for restored throttle mapping and clean combustion.

Technical Specifications

Compatibility

• 2016 Audi S8 Plus (4.0L V8 Turbocharged)
• 2017 Audi S8 Plus (4.0L V8 Turbocharged)
• 2018 Audi S8 Plus (4.0L V8 Turbocharged)

Frequently Asked Questions

Does this fit the D4 S8?
Yes, this is a direct fit for the 2016-2018 Audi S8 equipped with the EA824 4.0L twin-turbo V8 engine.

Do these spark plugs require gapping prior to installation?
While pre-gapped to factory specifications, verify the electrode gap with a feeler gauge prior to threading into the aluminum cylinder head.

The Audi Precision Standard

High-output European biturbo platforms require precise primary-to-secondary coil resistance to prevent false-positive diagnostic trouble codes (DTCs) and unmetered ignition hesitation; this kit ensures seamless communication with the factory Bosch MED17 ECU without triggering a CEL.