Quote:
Originally Posted by hatzie
The cat got excessively hot?
What does the substrate in the cat look like?
Might be worth looking in through the O2 sensor bung with a borescope.
Darn handy to see the Denso trademark with the GM 12587785 part number. Now we know who made them.
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i dont have a boresight i did run a piece of wire thru the bunghole didnt feel anything in it i ordered all 4 new o2s but i have not taken out the other 3 yet will see what they may look like