I am have a 92 325i and I have now burned up my second cat in as many months. I believe the car might be run rich and causeing this problem. I have replaced the O2 sensor the last time I replace that cat. which was all of three weeks ago. Now I am just tiered of wasting the money. I plan to run a small muffler or resonator in place of were the stock goes. Does anyone have any different ideas or input on my problem.
theres 2 kinds of cats one with a trillion beads packed inside of it and one that has alot of tunnels. which one are u running?
downside: in running without a cat is SMOG. and u will smell a hint co2 while driving. and you will smell alot if ur inside a garage.
upside: it will sound like a beast
you're smelling hydrocarbons. it's nastay! get a universal cat from Catco or something and save yourself a ton of money. but before you do that, find out why you're burning them up. check your injectors to see if they haven't failed (leaking? not spraying?) and check your airflow meter to see that it's functioning properly. I'm new to Bimmers, so this is uncharted territory for me...but fuel injection is the same principle across the board. start troubleshooting!
i took out the Cat on my car a month ago and it made a huge difference, you do smell unburned hydrocarbons, but the sound is addictive. I haven't had much of a problem with soot, just noticed the inside of my tip get a bit darker.
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