cat. converter

Swbari00 · Post by **Swbari00** » Sat Feb 04, 2006 8:35 am

what is the factory waranty on the cat? is it just the 36K or is it longer?

Post by **HenryJ** » Sat Feb 04, 2006 8:37 am

It was 80k miles, but rumor has it that has been extended to 120k

Swbari00 · Post by **Swbari00** » Sat Feb 04, 2006 9:26 am

woo! thats what i wanted to hear!! im hearing a ticking noise comming from my passenger side floor board...and a metalic ratling sound...maybe cat?

a2b · Post by **a2b** » Sun Feb 05, 2006 3:43 am

mine went out at 65k. of course this was after driving 2 days on it with no 02 sensor, precat and getting about 6 mpg

AZS10Crew · Post by **AZS10Crew** » Sun Feb 05, 2006 6:09 am

Pretty sure it's 10 years, 120K.

Swbari00 · Post by **Swbari00** » Mon Feb 06, 2006 12:41 pm

does a cat make anykind of hollow metalic ratling type sounds? I have been trying to get this fixed forever but everytime i take it in, something comes up and it doesn't get fixed

BADs Crew · Post by **BADs Crew** » Mon Feb 06, 2006 3:40 pm

It sounds like the the heat shield has broken loose on it. Sometime you can find a shop that can tack weld it so it stops rattling.

Steve2003 · Post by **Steve2003** » Wed Feb 15, 2006 4:34 pm

I have been having this pinging noise coming from under my truck for a few months. It started out as just a ping once in a while and has gotten worse. The tune-up didn't help. I remembered reading a thread a while back about it possibly being the cat converter. I crawled under my truck and looked arround and didn't see any thing loose. I then tapped on the front cat converter with my nuckles and it sounded like it was full of sand. Does that mean its bad?

Steve M

Post by **HenryJ** » Wed Feb 15, 2006 5:15 pm

Steve2003 wrote:...I then tapped on the front cat converter with my nuckles and it sounded like it was full of sand. Does that mean its bad?

It is possible.
You should hear nothing loose inside.

Check out this thread- Plugged Pre-cat

Steve2003 · Post by **Steve2003** » Wed Feb 15, 2006 5:44 pm

I read that thred and my truck is doing some of the same things. The spark knock is exactly what it sounds like. I have also noticed that my truck is running a little hot especially since it's winter. The mileage seems to be getting worse. I will take it to the dealer. I just want to have all my ducks in a row before I take it in.

Thanks

Steve M

Post by **HenryJ** » Wed Feb 15, 2006 5:49 pm

Return the programming to stock and watch out for any aftermarket accessories that they may blame for it running rich and destroying the cat. Not that is is their fault, but they will be blamed.
I think the precat is a good idea that just didn't work out very well.

Steve2003 · Post by **Steve2003** » Wed Feb 15, 2006 5:54 pm

Do you think they might blame the flowmaster? I called a friend of mine and he told me to get fixed right away that it might ruin my flowmaster.

Post by **HenryJ** » Wed Feb 15, 2006 6:43 pm

No, I think your flowmaster is fine. The issues should be before the cats.
The cat provides plenty of back pressure and the sensors should make the needed adjustments to prevent converter damage.
I think the precat is just too easy to foul, and too small to not go bad. The main cat should be more than enough to meet emissions standards, although you would fail the visual inspection without all parts intact.

Steve2003 · Post by **Steve2003** » Fri Feb 17, 2006 7:01 pm

Will the pre cat going bad cause the service engine soon light to come on and set off the P0410 code? Was just curious if I have more then one problem. Any help would be appreciated.

Thanks Steve M

Post by **HenryJ** » Fri Feb 17, 2006 7:15 pm

Steve2003 wrote:Will the pre cat going bad cause the service engine soon light to come on and set off the P0410 code?

I am not sure, but don't really think so.

GM data wrote:Conditions for Setting the DTC P0410

* The HO2S voltage does not decrease to less than 222 mV within 1.2 seconds when the AIR pump turns on during Closed Loop operation. AND
* Short term fuel trim does not increase above a predetermined amount.

I suppose it is possible the two are related. I did not experience that though. The air pump code has usually been do to contamination and water in the pump. I would fix the plugged cat problem first and see if there is improvement.
Under warranty they should inspect both. You will know more after that.