Gen 3 cats/downpipes

plh

Explorer
Just wondering if you tried a "spark plug non-fouler" modification to the o2 sensors after the cats before replacing the cats.
 

KyleT

Explorer
The cats were in bad shape. Highly restrictive. I thought about that though.


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Offroadmuch

Explorer
Not familiar with what you have pictured there. Is that a spark plug screwed into an improvised fitting welded into an exhaust pipe for possibly igniting residual flammable vapors as they pass through the exhaust system to help clean up smog emissions that would otherwise be detected during a smog inspection? Great idea...
 

plh

Explorer
Here is a photo before installed. 1 is drilled out to 1/2". Other is left alone.
IMG_20160908_120440882.jpg
IMG_20160908_120527208.jpg
 
Last edited:

cnutco

Adventurer
I just replaced my y-pipe/cats a few weeks ago. Then my vacuum tubes needed to be replaced too to clear codes.

My manifold currently has a hairline crack that sounds at first crank but then settles down shortly after.

I would be very interested in aftermarket or custom headers!



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redraif

The uphill battle begins
Spark plug non fouler trick worked for me to pass emissions... but the cat was indeed dying. Had to cut it off recently. Now I'm debating if i run catless on that side and let the nonfouler keep codes at bay for emissions.

Decisions, decisions... have a friend who knows a welder who will make an "off road" version out of my reminant pipe. Then i can always reinstall the cat equipt replacement section later.
 
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