Bad Cat? or Something else

[DontPressureMe]

88 chevy k2500
127k miles
pretty sure its stock cat

when i drive highway speeds eventually my truck will bog and the AC system smells like burning matching so ill have to turn it off

and my engine light will come on and it’ll read code 24.

i’ve checked the speed sensor and covered anything that looked close to shorting out. and i have a new sensor in place. (trans rebuild)

the bogging will turn off my radio . if that matters.

any help with be appreciated

 

[PlayingWithTBI]

pretty sure its stock cat

If it is indeed a stock pellet style Cat, get rid of it and get a high flow one. You gain quite a bit of performance.

Your problem sounds more electrical than exhaust though.

 

[DontPressureMe]

If it is indeed a stock pellet style Cat, get rid of it and get a high flow one. You gain quite a bit of performance.

Your problem sounds more electrical than exhaust though.

any way to actually confirm that

 

[PlayingWithTBI]

any way to actually confirm that

With a scanner, watch your O2 feedback and INT/BLM. You said it smells burnt and you have to turn stuff off - that's not what a plugged Cat does.

 

[PlayingWithTBI]

Then look for burnt wires and/or connections.

 

[99xcss4]

if your cat looks like this it is a pellet cat

You must be registered for see images attach

get rid of it and replace with this https://www.ebay.com/itm/3559624525.../7eRBlmbK20FWz1ZlDMUPxSAq/|tkp:Bk9SR5jRpdKwZA if you have to have one if you do not have to have one then just put a pipe in its place

 

[DontPressureMe]

With a scanner, watch your O2 feedback and INT/BLM. You said it smells burnt and you have to turn stuff off - that's not what a plugged Cat doe

Then look for burnt wires and/or connections

i found a vacuum leak and it stopped my truck from bogging down but i still have an code 24 problem and the faster i went
the more messed up it was getting. could it be the “new” sensor or just some bad wiring

 

[PlayingWithTBI]

i still have an code 24 problem and the faster i went
the more messed up it was getting. could it be the “new” sensor or just some bad wiring

Get a scanner and see what it says.