[Shotimes] What can destroy a cat?

[cmichaelo@optonline.net]

I've heard about oil leaking into the cylinders through the valve guides, but supposedly that should generate a blue puff of smoke when I start the car, and that I don't see.  So I can imagine that perhaps oil is entering the cylinder through the cylinder walls or due to a broken cylinder head gasket.

Which one is more likely, and are there other ways oil can enter the cylinders?

Michael Olsen
94MTX,green,BOS+,130k

----- Original Message -----
From: Bill Murray <fordsho@cloud9grafx.com>
Date: Tuesday, June 15, 2004 12:32 pm
Subject: RE: [Shotimes] What can destroy a cat?

> Burning oil will also cause cats to go bad.  They are not designed to
> burnoff the extra "stuff" that the exhaust will have in it.
> 
> Bill Murray
> 
> > -----Original Message-----
> > From: cmichaelo@optonline.net [cmichaelo@optonline.net] 
> > Sent: Tuesday, June 15, 2004 11:20 AM
> > To: shotimes
> > Subject: [Shotimes] What can destroy a cat?
> > 
> > 
> > I have now destroyed my second catalytic converter. I'm 
> > trying to find out if something is wrong my engine, or if the 
> > cats were just of poor quality to begin with. 
> > 
> > Both cats were bought from Sho Shop in 1997. 
> > 
> > The first cat lasted about 40k, and the second about 30k.  
> > 
> > I strongly suspect that the first cat died to some prolonged 
> > trouble with the MAF which produced rich fuel mixture. During 
> > the life of the first cat I only averaged 17-18 mpg.
> > 
> > But with the second cat I had no such problem with the MAF.  
> > I'm now averaging 20-21 mpg. However, I do have an excessive 
> > oil consumption, and I'm wondering if oil is leaking into the 
> > cylinders and is burning up, if that can destroy a cat?
> > 
> > What else could destroy a cat?  I have 130k on the car. New 
> > oxygen sensors. New 77mm ProFlow MAF. No chip.  Good 
> > acceleration.  Good idle.  Car is due for 60k though.
> > 
> > Michael Olsen
> > 94MTX,green,BOX+
> > 
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