Ignition Coil & Iridium Spark Plugs for BMW 840Ci (1996-1997) 4.4L V8

High-Performance Ignition Coil & Iridium Spark Plugs for 1996-1997 BMW 8 Series

What it Does: Restores factory ignition sequence and combustion efficiency by replacing degraded OEM coils and worn plugs with upgraded high-dielectric epoxy coils and fine-wire iridium spark plugs.

The Stock 8 Series Ignition Degradation

The M62 4.4L V8 engine in the E31 chassis generates severe thermal loads. Over time, this intense heat cycling compromises the epoxy insulation of the factory ignition coils. Once the thermal barrier cracks, voltage leaks inevitably follow, resulting in weak spark delivery, rough idling, and under-load misfires. Furthermore, older factory-style spark plugs suffer from accelerated electrode erosion. This widens the spark gap, forcing the failing coils to work harder and compounding the M62's ignition failure loop.

The Engineering Solution

This complete 16-piece ignition kit directly addresses the E31's thermal shortcomings. The replacement ignition coils feature upgraded copper wire windings encased in high-temperature dielectric epoxy resin, drastically reducing heat soak vulnerability and stopping voltage leakage. Paired with eight fine-wire iridium spark plugs, the system requires less voltage to fire while delivering a stronger spark front. The iridium alloy resists high-temperature erosion, ensuring consistent gap tolerances. This stabilizes the M62's idle, improves throttle response, and prevents unburned fuel from damaging catalytic converters.

Technical Specifications

Compatibility

• 1996 BMW 840Ci 4.4L V8
• 1997 BMW 840Ci 4.4L V8

The BMW Precision Caliber

Engineered to meet exact European mechanical tolerances, this ignition system upgrade guarantees a clean install with no erratic Check Engine Light (CEL) codes. Restoring your M62 V8 to peak operating condition ensures the smooth, linear power delivery expected from an autobahn-bred grand tourer.