Walker 921-2003 Ignition Coil

Walker ThunderSpark Ignition Coil 921-2003

Walker ThunderSpark ignition coil 921-2003 is a direct-fit ignition component for select GM, Isuzu, Buick, Saab, and Hummer applications. It is listed for vehicles such as the Chevrolet Colorado, GMC Canyon, and Isuzu Ascender, with fitment spanning 2002-2008 model years.

Key Features

• Ignition coil for select 2002-2008 applications
• Walker ThunderSpark product line
• Fits multiple truck and SUV platforms, including Chevrolet Colorado and GMC Canyon
• Part number 921-2003 for catalog lookup and ordering
• Position listed as N/A in the fitment data

Fitment Details

• Fits 2008 Isuzu Ascender, N/A
• Fits 2004-2005 Isuzu Ascender, N/A
• Fits 2007-2008 Isuzu i-290, N/A
• Fits 2007 Isuzu i-370, N/A
• Fits 2004-2006 Chevrolet Colorado, N/A
• Fits 2004-2006 GMC Canyon, N/A
• Fits 2006 Hummer H3, N/A
• Fits 2006 Isuzu i-280, N/A
• Fits 2006 Isuzu i-350, N/A
• Fits 2004-2005 Buick Rainier, N/A
• Fits 2002-2005 Chevrolet Trailblazer, N/A
• Fits 2002-2005 Chevrolet Trailblazer EXT, N/A
• Fits 2002-2005 GMC Envoy, N/A
• Fits 2002-2005 GMC Envoy XL, N/A
• Fits 2004-2005 GMC Envoy XUV, N/A
• Fits 2005 Saab 9-7x, N/A
• Fits 2002-2004 Oldsmobile Bravada, N/A
• Fits 2003 Isuzu Ascender, N/A, Incl.Boot and Spring; ThunderSpark

What It Helps Address

• Engine misfire caused by weak or failing ignition output
• Hard starting related to inconsistent spark delivery
• Rough idle from degraded coil performance
• Loss of acceleration response tied to ignition breakdown
• Check engine light conditions associated with ignition coil faults

Installation Notes

Verify the vehicle year, make, and model against the fitment list before ordering. The catalog shows one application note for the 2003 Isuzu Ascender: “Incl. Boot and Spring; ThunderSpark.” Confirm connector style and mounting location on the vehicle before installation. Part number 921-2003 should be matched to the existing coil and vehicle application data.

Quality Assurance

Walker ThunderSpark 921-2003 is cataloged as an ignition coil for specific OE-style replacement use across GM and Isuzu platforms. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.