BlewSilverado

iTrader: (3)

Is there anyway to tell if your cats are clogged without taking them off? I have some of the metalic spun magnaflows on a 3" ory and they are welded on. I have heard of a couple of other guys that have had problems with the cats clogging on F/I set ups. The truck seems to have lost a little gas mileage and feels down on power. I am probably going to have to bite the bullet and take the y pipe off to see if I can tell if they are damaged.

Mangled03gmc

iTrader: (95)

Yes you would def be able to tell if you had a bad converter.. If the problem came out of know where, that would prob be a good place to start...

L7 Sierra

A trick I have seen is to weld a bung in the exhaust system, and put a schrader valve in when you want to measure back pressure and a plug when you don't.

I think Ideal is around 7psi or less, but I haven't owned to many cars with cats to bother to care.

thunderwagen

iTrader: (3)

I had a pair of those things and melted them within a year. IMO get rid of em and call it a day!

vanillagorilla

iTrader: (1)

You can tell, by looking at your boost/vacuum gauge. If you quickily rev the engine in park or neutral, and it builds positive manifold pressure, like 1psi or so, then the exhaust is plugged somewhere.

hog

less that 2 psi is ideal.

peace
Hog

ls3s10

same converters gave me hell on the dyno.. gut them quick i melted mine and center came out made horrible rattle and had to remove whole exhaust to get parts of metal from converter

Kevin08

check engine light should come on, it did on my cousins 2000 model

2005 Silverado

iTrader: (19)

Check for excessive heat from the cat, low flow out the tail pipe, if you can shake the exhaust and listen for loose parts. How i check out cats at work. So far im 100%

Dustin