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Possible clogged catalytic converter

Tiny
DOMESTICENG
  • MEMBER
  • 2004 SATURN L300
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 91 MILES
So how do you go about unclogging a "cat" on a 2004 Saturn L300? Is this an expensive fix? What makes it clog in the first place?
Friday, July 29th, 2011 AT 3:13 PM

3 Replies

Tiny
MHPAUTOS
  • MECHANIC
  • 31,938 POSTS
They usually collapse, this looks like a clog but the matrix of the converter has collapsed and causes a blockage, the cat will have to be replaced, age can be a factor, over rich mixture due to a miss fire can over heat the cat and "cook it"
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Friday, July 29th, 2011 AT 3:34 PM
Tiny
DOMESTICENG
  • MEMBER
  • 3 POSTS
Is it worth fixing? How much should it cost?
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Friday, July 29th, 2011 AT 4:12 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
Just to add to this one I had a feeling you had a clogged cat when you said in the question you asked the other day that you had to let up on the gas pedal for it to shift. So did you have a back pressure test performed to find this out?Which one is it?The most common one to clog up is the one towards the firewall the Y pipe one.
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Friday, July 29th, 2011 AT 4:13 PM

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