WTF ! New exhaust=ses light!

[Jason1351]

Got a new exhaust done from headers back. Got stuck with a cat cuz it's the law and my off road y pipe was rusting apart. Now if I drive over 10 miles, my ses light comes on until I restart it. Any ideas?

 

[east302]

Have you pulled the code?


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[LMB1500]

Old O2 sensor doesn't like the new cat?

 

[kennythewelder]

First off, know that by removing your cats, your truck will not pass emissions testing. But if you want to remove your cats, or you have already, here is how to trick the rear 02 sensors, so that you don't need to reprogram the ECM. click the web sight and you can order these, http://www.bigdaddiesgarage.com/mini-cat-cel-fix.html or you can do what I did and build your own. I used 4 sparkplug non foulers. I took the honey comb that I removed from my cats. I used a hack saw, and a bench grinder to make the honey comb fit into the spark plug non fouler. If you do this, use a dust mask, or even better a respirator, grinding the honey comb makes a lot of dust. Also if you pull the hack saw to ruff cut the honey comb, it works better. If you try to push the saw, its to aggressive, and the honey comb is brittle.The little pieces of honey comb you need, will need to fit between the 02 sensor and the non fouler, that is next to the exhaust pipe, inside the non fouler, it will look like the pic on the web sight where you can buy them. They will need to be about 1/2 thick, and need to fit just slightly loose. You don't want to crush the honey comb when you put the 2 non foulers together. It will crumble and not work. Also be sure that the honey comb is not clogged up. I just used my breath to blow the honey comb clean once I got it to fit inside the non fouler. This gives the rear 02 sensor what it is looking for, it thinks there is still a cat.

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[Supercharged111]

Guys he has a 95. Not only that he was catless before and everything was fine.

 

[laidbackbigun]

Knock sensor? maybe new exhaust is causing it to trip?

 

[Jason1351]

Yeah, the old O2 doesn't like the new cat. It doesn't effect anything so not worried about it. Thanks for the info guys.

 

[Supercharged111]

The O2 should be upstream of the cat and should not be affected by it.

 

[Jorge6.5]

Should be no o2 sensor post cat on OBD1

Maybe a coincidence? I would check the codes first and go from there

 

[90halfton]

Is it an egr code (32 I think). Seems like a common problem after exhaust change. Mines done it for 10 years. No noticeable downside to it other than the light