2000 5.3 Cat delete

[btfarm]

Friend's 5.3 GMC has a plugged Cat(s) at 160k miles and would like to eliminate the restriction altogether. Is this an EFI live sort of situation that gets him to a DTC free tune for it? Anybody else deleted the cat on one of these?

 

[THEFERMANATOR]

EFILIVE is the best way to do it, but the cheapest way is to take a 18MM spark plug anti-fouler and drill the center out big enough for an O2 sensor to pass through it. The install the anti fouler with O2 sensor into the downstream O2 bung. The O2 fouler will slow down the downstream O2 sensors reading enough to make teh ECM think the cat is still there and prevents the light in most situations. Otherwise download teh tune and turn the codes off for the downstream and defeat the cat safety portions and flash it back in.

 

[ak diesel driver]

I've also heard you can stack o2 bungs for the same effect

 

[btfarm]

I don't know what an anti-fouler looks like :dunno:

 

[THEFERMANATOR]

I don't know what an anti-fouler looks like :dunno:

It's not a GM site, but it shows you what one is and how to modify it to work. And you may also need to buy an aftermarket O2 sensor to use it as well as many OEM's are just to large to fit in even a modifeid one.

http://forum.e46fanatics.com/showthread.php?t=486937

 

[Mad Maxx]

Here's another How to: http://poisnus.com/files/Spark Plug Non Fouler Mil Elims/mil elims spark plug fowlers.htm

 

[btfarm]

Ahhhhh! So I see said the blind man...
Thanks guys, I'll pass that along.