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 2000 Silverado issues with exhaust. 
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Joined: Mon Feb 04, 2008 6:15 am
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Location: White House, TN
Status: Restoring a 68 SWB
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Post 2000 Silverado issues with exhaust.
Last winter I pulled into a pit accidentally and got stuck. A few days after that I noticed some rattling coming from around my drivers side exhaust manifold. Long story short, the catalytic converter had busted apart on the inside. I cut it out and threw a piece of straight-pipe in there temporarily, but it was still running very rough (undriveable). I figured maybe the exhaust had gotten clogged with all that stuff in the catalytic converter. I unhooked where the two exhausts come into one right before the muffler (in case the muffler was clogged), but it still ran rough. Finally I just cut off the other cat on the passenger side and hooked my front O2 sensors back up, but it won't hardly run (the rear O2 sensors are unhooked). I just thought if the rear O2 sensors were unhooked it would throw a code, but not make the truck run rough. I plan on hooking them back up, but I don't want to put it all together and then if that's not the culprit I just wasted a bunch of time.

Any thoughts? Will the rear O2 sensors being unhooked cause it to run that rough, or do I have a bigger problem?

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Sat Mar 16, 2013 3:44 pm
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Location: White House, TN
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Post Re: 2000 Silverado issues with exhaust.
Disregard. After I hooked the rear o2 sensors back up and pumped the gas for about a minute it fired up. Now to put the exhaust back together.

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Sat Mar 16, 2013 6:05 pm
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Location: Maynardville, TN
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Post Re: 2000 Silverado issues with exhaust.
Glad it's running better. Rear sensors should not cause a drive ability issue though, they just provide feedback to the computer to see if the cat's are working ok.

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Sat Mar 16, 2013 6:32 pm
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Joined: Mon Feb 04, 2008 6:15 am
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Location: White House, TN
Status: Restoring a 68 SWB
Part of TN: Middle
Post Re: 2000 Silverado issues with exhaust.
Thanks David.

No emissions here. I am just gonna run straight pipes in place of the cats, and use some spark plug defoulers to get the rear cats out of the airflow. Anyone had any success with this?

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Sat Mar 16, 2013 7:24 pm
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Joined: Thu Oct 25, 2007 4:38 pm
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Location: Beech Bluff, TN
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Post Re: 2000 Silverado issues with exhaust.
My 99 has No Kat, However I didn't do anything about
the O2. I just have the glaring Orange dash light. LOL

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