Initially, the EJ253 engine had two ignition coils (one for each pair of cylinders, i.e. 1-2 and 3-4) which fired the spark plugs directly twice per cycle. The ignition knock control system had fuzzy logic that enabled the maximum ignition advanced angle to be used without detonation since the programme continually adapted to changes in EZ30R Subaru EngineSubaru's EZ30R was a 3.0-litre horizontally-opposed (or 'boxer') six-cylinder petrol engine. Replacing Subaru's EZ30D, the EZ30R engine was first introduced in the Subaru BP Outback 3.0R in 2003 and subsequently offered in the Subaru BL/BP Liberty 3.0R and Subaru Tribeca.Compared to the EZ30D engine, changes for the EZ30R included:A lighter cylinder head and block by eliminating excessive
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