[Shotimes] What can destroy a cat?

[Ian Fisher]

Neither is likely or else you'd have more serious
problems. However, a failing piston ring will result
in oil being burned in the combustion chamber which
may be closer to what you have happening in your car.

Ian
--- cmichaelo@optonline.net wrote:
> 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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