What are some symptoms of a clogged cat, simple as that. I think mine may be clogged. Thanks a billion Cory

 

Clogged CAT will result in a progressive loss of power as rpm's increase.

If it is really bad, it will barely rev to 2000rpm.

Easy way to check is to remove the air injection tube frome the driver side exhaust maniold. This will temporarily open up the exhaust. If the car runs significantly better, then the CAT is plugged, or a pipe is crushed.

 

what about if it blows a bunch of carbon out at high RPMs, it did that to me the other day and hesitated it at WOT it does fine til about 4500 rpm then it just craps out kinda it loses power all of a sudden. maybe its the cat hopefully thats all it is

 

When my cat. got plugged up exhaust was noticably quieter, engine had no power, wouldnt rev up.

 

My Z71 had same problem. cut cat off and gained like 30 HP!! well at least it felt like it. maybe it did. lol.
Loss of power, hard starting, using oil (CAN LEAD TO VALVE COVER GASKETS LEAKING)!

 

my .02 is drive the car for a little while, and then stop and check if your manifolds are cheery red, ive seen that usually is caused by a clogged cat

 

I have a solution.... Gut it and see if it gets better

 

what kinda cat should i replace it with

 

Another way to tell if the CAT is plugged is by using a vaccuum gage. They are relatively cheap, and are great for engine diagnostics.

Attach a vaccuum gagae to the intake manifold, and not the reading at idle (should be 18-22"). Next hold the rpm at 2000, and take another reading (should still be high, maybe even 24"). repeat for 3000, 4000, 5000 rpm.

If the readings get progressively lower as rpm increeases, something is plugged.

Mine was so bad it only had 16" at idle, and droped to 12" at 2000rpm. Engine would die at 2500rpm.

I unplugged one of the air injection tubes, and readings immediatley went back to normal.

Don't worry too much about what kind of CAT to replace with, just make sure the inlet and outlet of the CAT has a generous taper, and has the right size inlet/outlet diameter. You''ll notice that the stock CAT has a fairly lousy inlet/outlet design. Almost anything is an improvement over stock.

 

what brand of aftermarket cat should i get that is good?

 

None

They are VERY overpriced and not worth the insignificant gains. Your best bet is to ditch the cat. and replace it with an off-road pipe. Hold on to the cat. until it's emissions time.

 

SLP 2OTL....Love the sound, unique look, and best flowing non cut-out....