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It's commonly known as "Detonation or Knock". Engine management systems can overcome pre ignition by the means of a knock or detonation sensor. The sensor will detect pre ignition and retard the engines timing to protect the engine from damage. Undesired engine behavior will occur such as loss of performance or power.
In a collision in which two young women in a Chevrolet Cobalt were killed when the ignition switch shut off the engine, GM only counted the death of the woman in the front seat, because the death of the woman in the back seat was not caused by the failure of the airbag to deploy. [16] Most of the victims were under age 25. [17]
In spark-ignition internal combustion engines, knocking (also knock, detonation, spark knock, pinging or pinking) occurs when combustion of some of the air/fuel mixture in the cylinder does not result from propagation of the flame front ignited by the spark plug, but when one or more pockets of air/fuel mixture explode outside the envelope of the normal combustion front.
Both of these cause significant degradation to traditionally constructed engines, posing both residue and corrosion issues in increasing proportion with increasing fractions of ethanol. Whereas age-degraded gasoline may simply polymerize, evaporate, and thus lose its flammability, age-degraded gasoline-ethanol blends can cause severe damage if ...
General Motors Company (GM) [2] is an American multinational automotive manufacturing company headquartered in Detroit, Michigan, United States. [3] The company is most known for owning and manufacturing four automobile brands: Chevrolet, Buick, GMC, and Cadillac, each a separate division of GM.
In 2002, GMC celebrated its 100th anniversary and released a book entitled GMC: The First 100 Years, a complete history of the company. [ citation needed ] In 2007, GMC introduced the Acadia , a crossover SUV , which was the division's second unibody vehicle (after the Vandura) whose predecessor, the GMT-360 based Envoy , was discontinued with ...
The GM Instrument Cluster Settlement was a 2008 class action settlement awarded to owners of certain General Motors vehicles with allegedly defective speedometers.The settlement allows the owner or lessee to get their instrument cluster replaced under the terms of a special coverage adjustment to their factory standard warranty.
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