QUOTE (sbr711 @ Jun 20 2010, 01:31 PM)
WOW, a 2006+ Accent with an actual mis-fire.... every time we get them, they run smooth as can be, and have have all 3-5 mis-fire codes, so we just install the latest mis-fire logic program and send them down the road.
Flashing MIL means something bad enough that will kill the cat.... get it repaired NOW !!
Exhaust system is not a monitored part... just the contents into the manifold/catalyst and what come out of the cat.. everything beyond has no value.
You have no knowledge of vehicles. Please don't post illegitimate things, with no known knowledge behind it. Flashing MIL dosen't mean that at all. There are very few codes that cause a flashing MIL... They can be vacuum related, exhaust related, or even intake related. Mass Air Flow Sensor, Map Sensors, TBI, leaks, exhaust leaks, etc, etc. All that can cause a flashing MIL. Flashing MIL means it's a pending code that comes and goes. The car knows somethings wrong, but sometimes in certain situations the car runs beautifully. The computer realizes this. So please, calm down. Dosen't mean it will kill the cat, however running it for a LONG period of time will damage the catalytic converter. The honey comb inside the cat that is used to extract harmful gases to the environment, is sensitive to gas. All the unburned fuel can harm it.
Secondly the exhaust system is heavily monitored... It tells SO much about the car. Lean, rich, how the cat is functioning, etc. They are by far the most important sensors on the car... Without them you know nothing about your vehicle. Could lean out, and detonate... How would you know? Ohhhh, your o2 sensor would tell you. Could be running retardedly rich... How would you know? Ohhhh, your o2 would tell you...