Will a Bad Catalytic Converter Cause Rough Idle?
Yes, a bad catalytic converter will cause a rough idle. When internal ceramic substrates melt, fracture, or clog with deposits, exhaust backpressure rises above the normal threshold of 1.5 PSI at idle. This backpressure prevents spent exhaust gases from exiting the cylinders, diluting incoming air-fuel mixtures and triggering engine misfires, erratic RPMs, and severe idle […]