Ignition Coil and Iridium Spark Plugs for Chevrolet SSR (2003-2004) 5.3L

Direct-Fit Ignition Coil and Iridium Spark Plug Kit for 2003-2004 Chevrolet SSR

What it Does: The complete ignition kit replaces degraded factory coil packs and worn spark plugs on the 2003-2004 SSR to eliminate cylinder misfires, stabilize secondary ignition voltage, and restore crisp throttle response.

The Stock Chevrolet SSR Ignition Breakdown

Factory ignition coils on the GMT368 platform face sustained thermal stress within a tightly packaged engine bay. Over operational life cycles, the original coil winding insulation and epoxy potting deteriorate under high cylinder head temperatures, causing internal resistance breakdown and high-voltage arc leakage. Paired with aged spark plugs suffering from widened, eroded ground gaps, the stock ignition system regularly manifests high-load misfires (DTC P0300), sluggish off-idle acceleration, and unburnt hydrocarbon fouling.

The Engineering Solution

This complete tune-up kit restores primary and secondary ignition circuit integrity. The eight square-body coil packs are constructed with high-dielectric epoxy potting and high-conductivity copper windings designed to resist internal thermal fatigue and deliver a sustained 35kV+ output. Paired with fine-wire iridium-electrode spark plugs, this kit lowers ionizing voltage requirements, resists carbon fouling, and creates an efficient flame front for optimal combustion in the all-aluminum LM4 block.

Technical Specifications

Compatibility

• 2003 Chevrolet SSR Base 5.3L V8 (Engine Code: LM4)
• 2004 Chevrolet SSR Base 5.3L V8 (Engine Code: LM4)

Frequently Asked Questions

Does this fit the GMT368 SSR?
Yes, this is a direct fit for the 2003-2004 Chevrolet SSR equipped with the LM4 5.3L engine.

Do these iridium spark plugs require manual gapping before installation?
No, these iridium spark plugs come factory pre-gapped for the 5.3L V8; touching or forcing feeler gauges against the fine-wire iridium electrode can damage the tip.

The Chevrolet Muscle Caliber

Built for the unique power profile of Chevrolet's retro-styled muscle truck, this direct replacement set ensures consistent ignition timing and high-rpm spark stability. It eliminates spark blowout under wide-open throttle, keeping your small-block V8 running smooth and responsive.