[paranoidredneck]

Code 2285 and runs rough. Should results be different when ICP unplugged?

Truck starts fine but idles and runs rough. I have code 2285.
I pulled the connector off the icp and it still started and ran the same.
Is this normal? I just want to double check everything before I go and buy parts.

What else should I check?
Truck is an 04 if it means anything.

 

[paranoidredneck]

I put in a new icp sensor and pigtail today.
The truck runs better, but still runs a little rough. No codes now.

Also, I let the truck idle while I gave it a bath today. Several times, there was a muffled pop sound from the exhaust followed with a small puff of black smoke.

Any ideas?