clogged cat
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clogged cat
Hey guys I know my cat is clogged an I got a new one don't got a welder tho. I just got a rebuild short block I'm going to put in my truck tomorrow my question to you guys is will it hurt the new engine if I run it with a clogged cat to go straight to the muffler shop 15 miles tops
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From: Clayton MI
Go straight to the muffler shop.
I would also bet real money that your heads are cracked...... your plenum is blown, and the front O2 sensor is toast. Read the plenum sticky at the top of this forum.
I would also bet real money that your heads are cracked...... your plenum is blown, and the front O2 sensor is toast. Read the plenum sticky at the top of this forum.
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Joined: Apr 2010
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From: Clayton MI
Ah, so there is more to this story than you are telling in this thread. 
Yeah, you wanna fix the plenum, and get rid of that cat as quickly as possible. Probably wouldn't hurt to gut it before you fire up the new engine. Or at least, pull the front O2 sensor out of the exhaust. Let the engine breath.
Yeah, you wanna fix the plenum, and get rid of that cat as quickly as possible. Probably wouldn't hurt to gut it before you fire up the new engine. Or at least, pull the front O2 sensor out of the exhaust. Let the engine breath.
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Well with my brand new engine I am not sure if getting rid of the cat would be a good idea not because of emissions (not required) I have been told by a few mechanics to just put the new one in the claim cutting it out will mess with my air to fuel ratio is that tru or will I really be completely ok to cut that expensive SOB as far as mechanical
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Joined: Feb 2015
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From: CA
i would recommend getting a performance cat. i got mine from magnaflow, its a small little bugger but it works good. Id imagine your o2s arent gonna get proper reads without a cat, and you might blow check engine lights all day long if you loose the cat and the o2s. Just make sure your plenum is fixed before you put the new cat on, and replace the upstream o2 if its original. thatll save you some grief
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From: Clayton MI
The Front O2 is the major influence on mixture, so, the cat has zero influence there. The rear O2 has a very minor influence, and can be fooled with the non-fouler trick. (see DIY section.) My cat has been hollow as long as I have owned the truck.....