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Replace Non-CARB compliant Catalytic Converter with CARB compliant
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go hereXJ (84-01)
All OEM related XJ specific tech. Examples, no start, general maintenance or anything that's stock.
No code yet, but it's making noise. So are you saying use the new carb compliant and undo the o2 sensor?
I think he means trim the existing exhaust pipe and/or the ends (where there's no catalyst, it's just regular pipe) on the new CARB to fit in the line behind your existing O2 sensor and weld it.
The downstream sensor is mostly to check the converter function, it doesn't affect engine performance, but it WILL throw a code if it's disconnected/removed. You will fail inspection if there's a code. In MA if you have too few miles since the last time the codes were cleared they will fail you for it -- so if MA does it, CA certainly does too. I was actually shocked to learn that that MA lets vehicles over 15 years old go without emissions testing. With all the road salt they use here, there aren't many that last that long, so I guess that's probably the reason.
A person, unlike myself, willing to skirt the law would order the cheaper, easier to install converter (that probably functions just as well as the CARB one) and have it shipped out of state to a friends house and then have that friend forward it to me (I mean, the unscrupulous person) and install it in a DIY manner. Even if that scofflaw couldn't weld, they could easily grab some couplers from their local parts store to make it work. If the scofflaw wanted to have a shop install it, AND had friends out of state, they might decide to visit their friends and have a local shop do the work while they visit their friends. Then the absurdity of CA law isn't in play and any competent exhaust shop could weld a cat into a vehicle in no more than an hour or two of labor and if anyone asked the rebellious brigand could claim they were moving and hadn't switched the plates over yet. If I had to bet on it, I'd bet they wouldn't even be asked.
If the unscrupulous person worried it looked too new, they might scuff it up and spray some water on the outside to encourage a little surface rust... however, in my experience the standard aftermarket exhaust parts don't need any extra encouragement in that regard.
I think he means trim the existing exhaust pipe and/or the ends (where there's no catalyst, it's just regular pipe) on the new CARB to fit in the line behind your existing O2 sensor and weld it.
The downstream sensor is mostly to check the converter function, it doesn't affect engine performance, but it WILL throw a code if it's disconnected/removed. You will fail inspection if there's a code. In MA if you have too few miles since the last time the codes were cleared they will fail you for it -- so if MA does it, CA certainly does too. I was actually shocked to learn that that MA lets vehicles over 15 years old go without emissions testing. With all the road salt they use here, there aren't many that last that long, so I guess that's probably the reason.
On 2000 and newer cars in Ca. the smog test is , plug in to the computer and read any codes and to see if the monitors are ready and show complete if any of the monitors show failed you will fail the smog test .
I had to cut the CAT off with a reciprocating saw and then grinded the small piece which overlapped the exhaust because it wouldn't slip off. I also cut the old tailpipe at the muffler because it was easier to remove. The kit comes with the 3 clamps and I was able to save one form the old installation. So far it's working great.
03-19-2019, 05:22 PM
