on the way home from work, car sounded way quieter than normal with loss of power, motor runs fine but it feels like im pulling another car, think this has to do with the gas consumption?? i then disconnected the MAF and drove, no check light, and the car ran the same

 

Starting to sound like a clogged converter

Massey

 

I agree with Massey. It's gotta be a bad cat. They normally involve lack of power and sounds real quiet or have a real deep dull tone.

 

how would i know which one is it? or would it be equally bad? also, would this be a one to one swap out?? im not a welder nor a blacksmith


Magnaflow 23477 Direct Fit Catalytic Converter - eBay (item 310306111318 end time Apr-21-11 06:30:08 PDT)

 

also if anyone could reccomend one that would be helpfull too

 

To test you want to pull the fuel pump fuse and remove an O2 sensor. Then install a a pressure gage.

youtube is your friend
YouTube - exhaust back pressure testing

You do not have to make an adapter like they show. Most Vacuum gages have a large cone that work fine for a crank test. You do not need to start the car for the crank test, that is why I said pull the fuse. If your cat is real bad it will not pass the crank test. Anything over 1 PSI is a fail. At around 3-4 PSI the car will not even start. 90% car that I have tested, if they pasted the cold crank test they will pass the running test.


Just make sure it is a Vacuum/pressure gage and not just a Vacuum.

 

that cat will fit dude but only the drivers side

or just take cats out hahah

 

haha yea thats always an option

thanx 4 the test tip gorn

update- bout to test back pressure had to move the car, when i started it ran for a second then cut off, then started again and gave it some gas and it started to stammer and hearing some loud back fire arc, so i cut it off

 

Just a word of warning: as these higher power V8s will no longer run the clogging become a complete clog very quickly. I had a L98 with a no start condition and it had fuel and spark. I hooked up my gage like normal and spun the motor over. The gage blew apart in my hand and left my hand numb for a few minutes. These motors are just big air compressors if the exhaust cannot breathe. It very rare for that much back pressure but possible.

 

thanks for not telling me that before i went under there else i woulda call my friend over to "help"

update- i pulled the o2`s before the cat to test, at idle the needle jumps between 0-1 psi, at constant 2000 rpm the needle jumps between 1-2 psi,

after running for for about less than a minute when i revved all the stammering and backfiring went away, gunna test one thing before i drop the car down, i`ll plug in the o2 back and run the car to see if the cats turn red.