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Fired up my pile yesterday after it sat for a week or so, and it's hazing at idle pretty badly. Grey smoke, smells like [thick, but] healthy exhaust. I have straight exhaust with just an expansion chamber and I can see a pronounced 'puff' of thicker smoke that makes me think it's one cyl in particular. Searching for hazing or haze didn't turn much up so I figured I'd post for thoughts before I pull the trigger on a set of RV275s from DAP (24v head, P7100 pump). I'm heading out for a weekend of offroading tonight (towing heavy of course, probably 23-24k through PA mountains for 250+mi each way). I don't really want to try to check/set timing before I go, but it's possible that it has slipped since I did the cam swap 6-7 months ago. From what I read the popoff pressure difference 12v to 24v retards timing about 3˚, and I think I set mine to be effectively around 14-15˚ (17-18 by the table). Just put a fresh mechanical lift pump on it roadside a month ago after a sudden failure had me doing 30mph up hills on the DC beltway, and fuel pressure is good. I let it run for close to an hour, it never cleared up. Revs smooth, whether slowly or quickly - doesn't break up. This motor has seen a ton of abuse from me with the ongoing fuel line failures, it's probably done a couple thousand miles in 5 cylinder mode. Who knows what sort of issues that could cause in the long run. Also has a pretty unknown history besides having come from a bus, and having been under my hood for the past 40k or so. I've never done an oil analysis or anything. What I don't know won't scare me - - - Updated - - - details: stock ISB205 injectors (175-225k mi) stock B5.9 215 pump and DVs (311k mi) "Big Stick" cam Details (18k mi) I think this motor has some pretty healthy blow-by, it'll push some oil out the dipstick tube. Drinks probably a quart per 1000 miles when being worked. - - - Updated - - - sounds like identical symptoms that were confirmed by replacement here: http://www.dieselbombers.com/diesel-distress-support-ticket/100352-excessive-smokes-exhaust-popping-2.html I've had an exhaust "pop" when I'm to the floor under load for a little while, I was afraid I was barking the turbo and just stayed away from doing it. I can hardly wait to pull all my fuel lines. again. :banghead: