ok whell i removed the airpump sometime ago.. knowing full well the main cat

wouldnt last long, so now im just wondering how would you know if its cloged or

getting there or what.... sometimes on startup when i look behind the car there is

like blackish liquid on the floor like the exhust spit it out... not alot but enough to

notice.. and sometimes i feel that the cars not giving me the power it used to.. i

need to go get it inspected.. (been about 4 months now now problems but)

 

The black liquid is just condensation in the exhaust being spit out on startup. Completely normal.

 

thanks.. that answers one question.. is there any other way to cheak if the main cat is clogged without removing it?

 

Without taking it off and doing some flow tests on it, there's no real comprehensive way of knowing if its clogged or not. There are symptoms which suggest the cat is clogged:


Somewhat clogged:

* Lower secondary boost (but that can accure from other problems)

Really clogged:

* Idling and generally running problems (could be cause by other problems too)
* Not much air coming out from the catback

Just think of it like a water drain. It's hard to know your drain is getting clogged until its clogged.

 

I have no exhaust piping after the main cat and I can stare down into it when it's on the lift. You're supposed to be able to shine a flashlight down into the honeycomb material and see in between 3" to 4" inches deep into the honeycomb with no blockage. Mine is a solid ball of molten goo, it's also being gutted today You don't have to remove it from the system, but you will have to remove the side that faces the muffler to be able to see down into the material.

If it's glowing externally after a hard run, it's most definitely a clog.

 

Haha, nice analogy Mahjik.

 

thanks eric but i never really looked at it after a hard run.. but ill try to cheak it like you said