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Both Detonation and Pre-ignition are abnormal combustions. But there are different combustion phenomenons. Detonation causes three types of failure: (1)Mechanical damage (broken ring lands) (2)Abrasion (pitting of the piston crown) (3)Overheating (scuffed piston skirts due to excess heat input or high coolant temperatures) Pre-ignition caused by some other ignition source such as an overheated spark plug tip, carbon deposits in the combustion chamber and, rarely, a burned exhaust valve; all act as a glow plug to ignite the charge. Please identify the true cause of the problem, and resolve them. ESPEEDER always thinks about the real demand from the perspective of the user, provide high-quality products and services, hope our users have good shopping experiences. We provide detailed car compatibility data, please check them before your order. Or if you have any question, please let us know, and will try our best to help you. Vehicle Fitment: BUICK RAINIER 2004 CADILLAC ESCALADE 2002-2006 CHEVROLET AVALANCHE 1500 2002-2006 CHEVROLET CAMARO 1998-2002 CHEVROLET CORVETTE 1998-2004 CHEVROLET EXPRESS 1500/2500/3500 2003-2007 CHEVROLET SILVERADO 1500 1999-2007 CHEVROLET SILVERADO 1500 CLASSIC 2007 CHEVROLET SILVERADO 2500 1999-2007 CHEVROLET SILVERADO 2500 CLASSIC 2007 CHEVROLET SILVERADO 3500 2001-2008 CHEVROLET SILVERADO 3500 CLASSIC 2007 CHEVROLET SSR 2003-2004 CHEVROLET SUBURBAN 1500/2500 2000-2006 CHEVROLET TAHOE 2000-2006 CHEVROLET TRAILBLAZER 2003-2004 GMC ENVOY 2003-2004 GMC SAVANA 1500/2500/3500 2003-2007 GMC SIERRA 1500/2500 1999-2007 GMC SIERRA 3500 2001-2007 GMC SIERRA 1500/2500/3500 CLASSIC 2007 GMC YUKON 2000-2006 GMC YUKON XL 1500/2500 2000-2006 HUMMER H2 2003-2007 PONTIAC FIREBIRD 1998-2002 PONTIAC GTO 2004