Thanks all for the thoughts. I checked the EGR valve itself a few months back when I was going through everything on the top of the engine trying unsuccessfully to figure out the cold idle issue and the valve itself was fine. I found and JB welded the pin-hole in the EGR pipe that the previous owner had tried to solder some time back, but its possible that hole opened up again. I also recall someone finding issue not with their valve, but with their control solenoid for the EGR system. I understand it could be the cat, but I can't help but feel the cold idle issue is related to the NOX fail since anything on the little list they gave me could affect idle as well as NOX. I would like to run through that and maybe even get it solved before dropping a couple hundred on the cat.

As for time, it isn't absolutely necessary it get done this week, any time someone could help would be great. My tags aren't due till the 31st of this month, and I have 60 days (ok, 59 left) for my free re-test. I just am putting in 10 to 12 hour days, 6 or 7 times a week this month, plus work related Christmas parties, plus a bunch of other small problems that I need to track down. I feel that the only way I am going to sort out the cold idle and possibly fix the NOX at the moment is to have a spare mind and set of hands at the shop with me if at all possible to track it down. I have free boat and camping/climbing gear rentals, discounts on the coolest outdoor gear AND Mt Dew or beer I can bribe someone with... <img src="/forums/images/graemlins/smile.gif" alt="" />