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Internal Combustion Engine. Most engines in road going vehicles are 4-cycle internal combustion gasoline engines.

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Well as you have removed the catcon, the restriction and treatment to exhaust air has been removed which exits from the engine. The pressure drops around the catalytic converter is usually 50-200 Pa … depending upon the engine RPM. Thus when you removed the catalytic converter oxygen share in the increased which told the ECU that the air is rich in oxygen thus it has to lower the LTFT from 11% to …
answered Oct 7 '18 by SaharshJ