When engine runs with misfires, they can take out the catalytic converters due to unburnt fuel getting to them. They would overheat and glow red as they try to burn off the excess fuel and over period of time they would fail.
Just make sure you have the engine running well before you atttempt replacing the catalytic converters if required. Failure to do so would damage the new catalytic converters as well.
Friday, September 7th, 2012 AT 1:26 AM