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Piston Slap

Navigation:  Home > Class Action Law> Piston Slap


Piston slap is caused by too much clearance between the pistons and the cylinder walls within the cylinder bore of the engine. Plaintiffs allege that piston slap engines waste fuel and cause significantly higher vehicle emissions due to incomplete combustion, combustion of excessive amounts of lubricating oil and combustion chamber blow-by. Since October 2003, at least six suits have been filed in courts throughout the country, including one in Michigan and two in Oklahoma. The plaintiffs claim that loud, irritating knocking noises in engines have slashed the value of their vehicles and that GM refuses to fix the problem. Some owners also allege the defect causes the engines in some cases to use more than twice the amount of oil they should between oil changes. If the cases are consolidated, there's a good chance they will be granted class-action status, say lawyers involved in the cases.

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