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Message: [QUOTE="maplemale, post: 1160415, member: 17366"] GPs are new. At $10 a piece it's a no-brainer when doing injectors. Didn't replace the UVCH because it ohm'd to spec / didn't know at the time they were so finicky. After reading Lethalthreat's post and hearing that spec omhs might mean jack, we replaced it this weekend. Was a fun weekend with N2GN2!! Did the up-pipes, 4" exhaust, pulled injector (just to validate I didn't screw up the install and no unusual signs of wear -- looked perfect!), UVCH and a few other minor things. Keeping in mind the truck sounds 100% different / better, I will say that the idle seems much smoother. Also, the smoke starts as normal at 30 degrees, but seems to clear up almost completely within about 30 - 45 seconds! However, the EBPV seems to make it smoke again. It's a bit hard to tell because the exhaust is only half-way done and it's shooting out just past the down pipe (waiting on remaining exhaust piece.) Also waiting on the higher ICP tunes and new map sensor tune from Matt. It's pretty obvious though, the UVCH had a significant effect on the cold smoke. At only $65 a side (locally from Navistar), it's worth it and seems to = a smoother running truck all around. Something else that's interesting. It's pretty obvious with 4" straight-pipe when the EBPV comes on. Sounds like a jet turbine. Until the engine oil hits about 150ish it comes on while driving/dinking around. Odd? Normal? Seems like it comes on whenever I give it fuel until the RPMs hit about 1600, then it goes off again. This keeps up until the engine is 100% hot. Maybe I should just delete it... seems like a trouble-maker. I'd rather leave it for now, but wow is that loud! And how can it be normal that it comes on while giving it fuel? PS: Already cleaned the tube really well. Maybe the sensor is just toast? [/QUOTE]