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sammyg2 sammyg2 is offline
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Join Date: Aug 2000
Location: a wretched hive of scum and villainy
Posts: 54,960
A couple things I can think of that can cause a cat to clog up. One is contamination, like with excessive oil. Rare.

The one I've personally experienced was from running too lean so the cats got hot and melted.
That was on a POS ford ranger (redundant), where the primary fuel pump in the tank was really weak.
It provided enough fuel pressure for the injection at idle, but under load it would lean out and melt the two cats.
Did it twice before it was properly diagnosed, then I dumped the POS and got something better.

BTW if you spun a bearing, you don't need oil analysis. You'll be able to see the glitter in the oil.
Oil analysis is useful to determine if a bearing is kinda thinking about getting ready to fail.
Old 09-02-2020, 02:40 PM
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