Description: ACDelco Coil (Part Number: 19421261) is an ignition coil assembly that transforms battery voltage into the high-voltage spark required by spark plugs. Function: Converts low-voltage DC from the battery into high-voltage pulses used to ignite the air/fuel m ...

Description: ACDelco Iridium Spark Plug (Part Number: 12681663) — advanced iridium spark plug for reliable ignition and extended service life. Technology: Iridium electrode and laser-welded tip for durabilityBenefits: Enhanced cold-start, idle stability, and throttle ...

Description: 4.2l. Canyon, Colorado. 2.9, 3.7L, 2007-12. Hummer H3. Exhaust. Helps keep engine timing and fuel injection running in sync Helps provide proper alignment, positioning, and spacing for easy installation Synchronizes engine valves and pistons for excellent engine performance

Description: Canyon, Colorado. 2004-06. 2.9, 3.7L, 2007-12. Hummer H3. Helps keep engine timing and fuel injection running in sync Helps provide proper alignment, positioning, and spacing for easy installation Synchronizes engine valves and pistons for excellent engine performance

Description: ACDelco Ignition Knock (Detonation) Sensor (Part Number: 12623730) senses engine knock and sends signals to the engine control module (ECM) to help the ECM adjust ignition timing. Function: Detects detonation (engine knock) and assists the ECM (Engine Cont ...