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« on: August 26, 2008, 01:35:48 AM »
I own a 91 318is that I have done a lot of work to. I've replaced or touched almost every thing on this car, from front grille, radiator, engine, suspension, interior, paint, rims, steering wheel, etc. There is a Mark D chip and about 90,000 on this engine. I run 91 octane. The wires and plugs are less than a year old. I put a new universal Cat on the car in March of '07. By Febuary of this year the Cat had a hole in it and the warrenty covered it. Now 6 months later, it is making the same noise it did back in Febuary. This seems to happen when I take long road trips, say longer than 2 1/2 hours on the road at one time. This time of course the warrenty is over. What would cause the cat to get a hole in it, or maybe burn a hole? There is also glass pack between the cat and the muffler. I have not run over anything that would hit it. The brackets and so for under the car are all in good shape. The o2 sensor is about 8 months old, OEM. Could it be a cheap universal cat? I bought a supersprint muffler a few months ago and now is a good time to put it on, but I do not want to run into the same problem I have now. Any tips would be greatly appriciated.