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Message: [QUOTE="glovemeister, post: 1566699, member: 3867"] Purchased a truck a 99 superduty number of years ago with 238 or 250/80s, with t4, smith bros push rods and comp cams 910 springs, and arp headstuds. It hazed at startup, until eot reached 160 then it quit. It stinks like fuel. I tried 3 different tuners customer tuners on chips I got with the truck. I pulled the sticks and had them flowtested, about 5 years ago, they passed. Also disconnected each injector and it made no difference to the smoke. I've pulled off the downpipe back then and it looked try/no oil. I've ran a Ford spec blowby test using the special tool and it passes. I've also compression tested it twice with 2 different gauges, it looked good north of 400psi. Checked fuel pressure twice, once with in cab, and one with underhood manual gauge. Idles pretty good. Unplugged MAT no change. Can't remember if I verified EOT or not, but I'm thinking if that sensor was bad it would messup fueling according to a read of the shop manual. I do seem to think I may have an oil consumption problem. Maybe a quart or so in like 3k miles. Recently decided I didn't like the hooptie look, and this was just how it was with large sticks, so I installed brand new alliant power ac code 160/0s. It does have zero miles on it, just driveway idling so it does not idle that great. But I also didn't want to smoke a piston if it was leaking fuel with the smoke. I've tried running it on stock SD tunes/no chip, and also on the 238/80 tuning on stock/daily setting and it seems to do the same thing. Granted I know it would be better to have stage 1 tuning, but in my mind 238/80 tuning is gonna call for x pulsewidth will only be so much fuel allowed by the sticks. Should I get a custom stage 1 tune, before I worry about this more? Or should a daily setting on hydra chip work? I've been thinking the only other thing it could perhaps be is a leaking turbo, or valve seals/guides leaking allowing oil into the cylinders. Kinda at my wits end with this thing. [/QUOTE]