W124 E200 Cat converter

[JerryG]

Has anyone had trouble with their cat converter and is failure at 100000 miles normal? Is there anything that can contribute to failure? I would appreciate any information that anyone might have.

 

[dieselman]

Cats do fail. 100K is not unreasonable given the age of the car.

Poor starting, running too rich, misfires and driving through water or over bumps will shorten a cats life.

 

[JerryG]

W124 Cat Converter

Thanks for your contribution dieselman.
I've been thinking about your comments especially about the misfiring. I've noticed that if I start the engine and run for about 30secs then stop it and restart it after a few hours it will misfire for 15 or 20secs. I know that raw petrol getting to the cat is detrimental. Have I a flooding problem after I stop the engine? Any more ideas?