Catalytic converter and O2 sensor

AMOFF1500

MEMBER
1995 CHEVROLET SILVERADO
5.7L
V8
4WD
AUTOMATIC
13 MILES

Ok, so I just recently bought a universal fit Flowmaster 223 high flow catalytic converter for my truck. The old cat has a O2 sensor on a piece of pipe in front of it and the old one has no place for an O2 sensor, is it possible for the muffler shop to cut the cat off right behind the O2 sensor and put the new one on without causing issues with my service engine light?

5 Replies

AMOFF1500

MEMBER
4 POSTS

I meant the new one has no place for an O2 sensor

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Tuesday, January 19th, 2016 AT 4:22 PM

AMOFF1500

MEMBER
4 POSTS

That's where I'm talking about, couldn't they cut it right between the cat and the sensor and weld the new one?

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Tuesday, January 19th, 2016 AT 4:49 PM

CJ MEDEVAC

MECHANIC
11,004 POSTS

YOU CAN DRILL A HOLE IN THE NEW CAT, 'BOUT THE SAME SPOT AS THE OLD ONE.

THEY MAKE A THREADED RING CALLED A "BUNG", IT CAN BE WELDED OVER THE HOLE

ON MY 1977 JEEP CJ-5 (CARBURETED, NO NEED FOR AN O2 SENSOR)) I INSTALLED AN O2 SENSOR AT THE END OF MY HEADER TO RUN MY AIR/ FUEL RATIO GAUGE (TO AID IN TUNING MY CARB/ INSTALLING JETS)
I USED A BUNG, PICS BELOW

THE MEDIC

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Tuesday, January 19th, 2016 AT 6:49 PM

AMOFF1500

MEMBER
4 POSTS

Thank you Medic, sweet CJ btw! I called the muffler shop that installed my Flowmaster 40 series muffler a few months back and explained my issue and they said normally they can cut between the sensor and cat but if not they have the bungs and can install one of those for me. You gave me reassurance until I could call the muffler shop. I was afraid that I had just wasted good bit of money on the cat that I bought and would have to try and get my money back and then wait a few weeks on another to arrive!

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Saturday, January 23rd, 2016 AT 6:13 PM

CJ MEDEVAC