Drive Cycle

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FreshBoxLive

TYF Newbie
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Just replaced the EGR valve to get my 2000 Z71 through emissions. SES light is off, and code P404 is gone. However, after many "drive cycles" and about 200 miles, my ECU reader detects that my Catalyst, Evap, and EGR monitors are not ready. I have GM's procedure on the drive cycle, so I am following that as close as I can. I also read that the Evap will not go ready without the fuel tank being 25%-75% full. With all that being said, y'all got some advice? I have never dealt with this problem before, and i have heard it can take up to 800 miles to fully cycle.
 

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