Will 30 Inch Tires Fit On A Stock 2001 Gmc Jimmy

Can a clogged catalytic converter unclog itself?

Well, it can happen that they will de-clog on their own, but usually need a helping hand.  If it is utterly blocked, then dismantling and manually cleaning is the only solution.If the ceramic material inside is melted, then change it.Most modern Cats are stuffed with a ceramic honeycomb structure, unlike the older ones that had complex filters with platinum wool amongst other stuff inside them.One of the reasons they get clogged is people lugging around in fifth gear making lots of soot which clogs the honeycomb.A faulty EGR valve (gas recirculation) will do the trick as well.Faulty injection, allowing to much fuel to come through the exhaust can cause the honeycomb to melt when it starts burning the fuel... (replacement)But you can clear a blocked (not 100% blocked) converter by getting it hot enough to make it finish what it is supposed to do.The garages here in France have a naughty technique, they hoist the car up on lift with the motor going flat out, and stand underneath it holding a fire extuinguisher, just in case it sets fire to the car, or any flames from the now burning soot comes blasting out of the rear.It is a dangerous technique in my opinion, and not good for the engine, but it works.  I don't suppose it works everytime either.So if you have a CAT that is partially blocked because you mooch around in fifth gear or have bad driving habits, you could try driving the vehicle hard enough to heat the CAT as it should be, where usually it can clear itself.So , if it is soot build up, there is hope for you, to unclog it without taking it off the vehicle and or changing it, if it is hard blocked with mineral deposits, unlikely. If it is melted, its got to be changed.