XxXChrisGXxX

iTrader: (1)

Anyone experience this with their v6?

I pulled off my old converter last week (converter was maybe a year or two old), and it was all melted inside on the engine side of it. There was big ***** of rock hard melted something or another all throughout the top of the honeycomb looking structure. Looks like a bunch of burnt marshmallows but rock hard.

I put a new converter on (magnaflow), with a new back pipe (PITA), and a new SS muffler. I get better gas mileage now...yay!

from 16 to 19 mpg, only measured this from my first full tank, going on the second now.

Just was wondering if anyone has experienced this and why it happens if for any reason?

My previous converter the heat shield fell off would this cause it?

RBob

iTrader: (1)

Double check the ignition system. Any misfire will turn the cat-con into a volcano.

RBob.

XxXChrisGXxX

iTrader: (1)

Everything is new and the car has been running really good.

RBob

iTrader: (1)

In that case I have no idea...

RBob.

project89

iTrader: (1)

typical meltdowns of a converter are from running extreamly lean, or really rich.
missfires cause a rich condition in the converter

the converter reacts witht he ex gas and heats up to burn any unburnt fuel if the engine is overly rich all that extra fuel overheats the converter and causes the melting

if u run extreamly lean the ex gases are super hot and can cause a meltdown as well

also over advanced ignition timing can do the same thing as running lean


what do the spark plugs look like?
were any of them black or really white ?

XxXChrisGXxX

iTrader: (1)

Nope they were all a nice chocolate brown. All new ignition system (8mm taylor wires, MSD blaster coil, dizzy, ICM, spark plugs, alternator), fuel injectors, all new sensors (GM AC Delco MAF NEW, and other sensors).

No codes, only thing that has happened recently is the new ICM I put in went bad. I put in another one with arctic silver this time.

I hope this doesn't happen to my new converter -_-

RBob

iTrader: (1)

With an EFI engine properly running in closed loop the center porcelain of the spark plugs should be bone white. It may be that the CTS is reporting a colder then normal engine temperature and the ECM is staying in open loop.

RBob.