2000 gmc sierra, has ticking issue, major knock, clogged cat???

[matty b]

I live in California. We know people. The visual isn't the problem, it's the pcm monitor the obd2 port Smog machine is looking for. That's why it's setup the way it shouldn't be

So do I and if you set the EGR codes to no error reported, you can turn it all off in the tune and it will say that the EGR monitor passed. Tryi it with your cats, set the rear O2 and catalyst codes to no error reported and voila, your IM monitors will say passed as soon as you key up the car.

[Asylumwarp]

Yep I already know all that.. But that isn't whats causing the truck to run like a POS.... May wanna re read a few posts back. Or we just got off topic. Either Way..

[matty b]

We got off topic.

[Asylumwarp]

Once the wideband is installed, i'll know a bit more on whats going on. The log is for a basic putt down the road.. idle-2500 .... this engine hasn't seen 3k..