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Pre-ignition
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==Causes of pre-ignition== Causes of pre-ignition include the following:<ref name=b1>{{cite book|url=https://books.google.com/books?id=gleuEwRhyBAC&pg=PT32|page=32|title=Automotive Engineering|author=Daniel Hall|publisher=Global Media|year=2007|isbn=978-81-904575-0-7}}</ref> * Carbon deposits form a heat barrier and can be a contributing factor to pre-ignition. Other causes include: An overheated spark plug (too hot a heat range for the application). Glowing carbon deposits on a hot exhaust valve (which may mean the valve is running too hot because of poor seating, a weak valve spring or insufficient valve [[Backlash (engineering)|lash]]) * A sharp edge in the combustion chamber or on top of a piston (rounding sharp edges with a grinder can eliminate this cause) * Sharp edges on valves that were reground improperly (not enough margin left on the edges) * A lean fuel mixture or excessive amount of oxygen in the combustion chamber * An engine that is running hotter than normal due to a cooling system problem (low coolant level, slipping fan clutch, inoperative electric cooling fan or other cooling system problem) * Auto-ignition of engine oil droplets (Can be solved by using an [[Oil_Catch_Tank|oil catch tank]])<ref name="solutions"/> * Insufficient oil in the engine * Ignition timing too far advanced * Too much air/too little fuel (octane) to withstand pressures (too much air causes too much pressure for the octane to handle, too little fuel reduces the octane to handle the pressurized air) <ref>[http://www.contactmagazine.com/Issue54/EngineBasics.html Engine Basics: Detonation and Pre-Ignition by Allen W. Cline<!-- Bot generated title -->]</ref>
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