So I know I need a new trans and about 2 months ago (I think lol) I got 2 p0420 codes, but I figured its just Cus I have a diff DP causing the CEL to come on, why would it take this long to come on though? :p
I've had this magnaflow downpipe for about 9 months now I believe. Could the cat be going bad already?? the car started running really rough about a week ago, surging and no power at all when I get down on the gas. Once it hits 2nd gear it bogs down and has no acceleration whatsoever. I was thinking it's my trans but could it also be my cat?

 

Hi `Frank,
If your `cat or kitty is clogged, I'd tried giving the cat a
laxative to see `if it helps ? Sorry, I couldn't resist...
==========================================
Do you smell a rotten `egg smell ? (It's one sign)
Click this link & see if you have any of these signs
Signs of a Bad Catalytic Converter | eHow.com <~ Click

Good Luck & please check back on your thread (?) & see what our expert member's posts...

 

thanks space but yep I think my cat is going bad
I'm going to take it to a shop and maybe they can do a pressure test on it or something :p

 

Good Luck `Frank,
Yes, I think a pressure test is the first step to take..I hope it's not a trans prob, because that can be expensive 4-Sure...

Below are a few links you may want to check out.
Is My Catalytic Converter Clogged?? PSI Pressure Test 2000 Chev ...



Jul 16, 2011 ... This is my exhaust pressure test on my 2000 Chevrolet Tahoe. I've been having slight ... Wanted to check for a clogged Catylitic Converter.
Is My Catalytic Converter Clogged?? PSI Pressure Test 2000 Chev Tahoe - YouTube



Fixing Bad Catalytic Converters With Inefficiency Code P0420 ...



Feb 3, 2011 ... Fixing Bad Catalytic Converters With Inefficiency Code P0420 .... scottykilmer 39941 views · How to check your vehicle's catalytic converter. 2:39 ...
Fixing Bad Catalytic Converters With Inefficiency Code P0420 - YouTube






How to test for a clogged catalytic converter? (Exhaust)
how do i test it ... What makes you feel that your Cat. Conv. is bad? Is the engine not exhausting as well as it should or did? You can go to Autozone ...
answers.edmunds.com/question-How-to-test-for-a-clogged-...

 

It could very well be the cat. These high-flows aren't made of the greatest quality, if your tune is running you rich you could destroy these things quick.

(think of the price difference between a real cat and these high-flows, that should tell you a lot)

 

My thinking is along the same lines. If the cat is clogged in 9 months time then putting another one on is just a 'band-aid'. You need to find the cause of the problem and solve it or you'll be back in the same position in short order.


Edit: As a comparison I put the Magnaflow DP on my Monte a month or two before you did and I'm not experiencing any problems with mine clogging up yet.

 

here in michigan we know longer have emissions testing....

I see your from florida...so why not just totally delete it? (cat)

That should resolve the problem!

 

well how would i know if my tune is running rich? :p

well im going to go get it checked out today and see whats up, might have to delete the cat lol

i know im now thinking about it, any pros and cons on deleting it? or should i just get another cat welded on?

 

You get tuning software hooked up to it and monitor your LTFT

Or you clean all of your filters and sensors (esp MAF and o2)

 

i already got my my sensors cleaned up and its still doing the same :p