Who here's D-Max is wet stacking? I see it a lot in generators that dont have enough load, but never would have expected it from my truck. I know I need to tow heavy which I dont. Any one else?

I give up..what exactly is wet stacking?:think:

I give up..what exactly is wet stacking?:think:
X2

When not all the fuel is burnt. Here a better explanation, I suck @ explaning. http://en.wikipedia.org/wiki/Wet_stacking

No comment!

A sign of it is black ooose ooosing out of the exhaust conections. I have one where the EGR block of plate is @.

I have never heard such a thing in our trucks :think: , but i guess it will give me another reason to hammer the go-pedal :D.

I only see it in my big 4 wheel drive tractors (600 hp 855 Cummins) when they idle for more than an hour.

Shouldn't happen in a machine engineered to run around town, take the kids to soccer and idle in traffic jams. I hope the enginners would do better than that..

If your getting a black ooze around your blocker plate, you either need to tighten up the bolts, get a new gasket, or it is just the same black soot that is inside the exhaust pipe. I really have never heard of this condition with a Duramax engine.

Who here's D-Max is wet stacking? I see it a lot in generators that dont have enough load, but never would have expected it from my truck. I know I need to tow heavy which I dont. Any one else?
I do!

I THINK wet stacking a function egt. I heard from older guys never to let a diesel idle in cold weather too long or risk wet stack the exhaust valves and comp. rings. If they have to be idled than the idle spedd should be kept up to provide for 750* F egt's. This is only what I have heard, I do not know this to be true.

I work on Deere diesels and we see it a lot on the older tractors, especially the ones that are turned up. It's really noticable on them due to the short exhaust and lack of a complete seal between the exhaust elbow and turbo. I can't say as though I've ever seen it on my truck, and with the variability of the injection systems on these trucks I'd think you wouldn't ever see it. I will say though that I can see it happening with a leak closer to the turbo, but I wouldn't think you would ever see it out of the exhaust. That's a lot of "slober".

I can't see our common rail diesels slober. You have that with the old diesel engines, but I just can't see that happening with the dmax. I would think the ecm would prevent that from happening.

I agree with some of the previous posters re: older diesel engines slobbering in cold weather at low RPM's. I have seen this lots of times with early 60's D4 and D6 Cats when someone pulled the throttle back from a higher idle setting to minimum idle.Usually ended up with black snot all over the hood if not caught in time and idle kicked back up.

My lly did, and lbz does that all the time. I pay for fuel, so I run at ~55 on the freeway. The few times i put my foot into it I have a black cloud for a few hundred feet. Stock truck, so the only thing I can think of is the unburned fuel in the exhaust, getting lit off when the egt's spike under heavy throttle. I have to crawl at 55 for a long time, like 60 or 80 miles before I can get the cloud. 10 or 20 miles, and no cloud.

My LBZ has just done it this weekend, it was cold and i had a boat behind me, ran it for 1/2hr to get gas for the boat, got back and soot looks like it had splattered on the fender....

My lly did, and lbz does that all the time. I pay for fuel, so I run at ~55 on the freeway. The few times i put my foot into it I have a black cloud for a few hundred feet. Stock truck, so the only thing I can think of is the unburned fuel in the exhaust, getting lit off when the egt's spike under heavy throttle. I have to crawl at 55 for a long time, like 60 or 80 miles before I can get the cloud. 10 or 20 miles, and no cloud.

Is that wet stacking or soot? It is normal for these engines to puff black soot after being babied for a while. The wet stack would be an ooze leaking from the exhaust system. The LMM has the diesel particulate filter (DPF) to trap the soot and burn it up. Oddly enough, I think it does it by injecting more fuel after the cylinder has fired and the raw fuel collects in the DPF and burns whatever is in it.

If your getting a black ooze around your blocker plate, you either need to tighten up the bolts, get a new gasket, or it is just the same black soot that is inside the exhaust pipe. I really have never heard of this condition with a Duramax engine.

Its wet soot, I think Im just goin to get some new gasket for the blocker plate and crank down on it. I have also been floorin the shit out of the since I seent it. Like I said before I never would have expected my truck wich is fairly new(36xxxmi) to wet stack. I usually see it on biger gensets.

Is that wet stacking or soot? It is normal for these engines to puff black soot after being babied for a while. The wet stack would be an ooze leaking from the exhaust system. The LMM has the diesel particulate filter (DPF) to trap the soot and burn it up. Oddly enough, I think it does it by injecting more fuel after the cylinder has fired and the raw fuel collects in the DPF and burns whatever is in it.

I believe it is still wet stacking. If it went on for several tanks of fuel, without ever bringing te egt's up, I would expect ooze anywhere there is a slight leak. As it is just lasting 45 to 90 minutes at a stretch (commuting) I don't expect that. A road trip of several thousand miles, on flat backroads, I would expect worse.

yea, like some guys have said, the old school term is "slobber".

the d-max will slobber in cold climates if idling to long, it's not good for it! i don't think it would happen under normal driving circumstances though.

i was forced to sleep in my crew cab a couple years ago. i only slept for a couple few hours. i had the BD idle up switch but i thought 800 was too high, i just felt it was hard on it with no load for an extended period of time and i couldn't relax in the truck while it was running so fast! so i left it at stock idle... anyhue..... when i woke up, she was all slobbered up. when i left to drive it, oh boy, she smoked bright blue for miles. :( oops sorry, ambient temp was about 0*. but i believe it is possible to cool off enuff if idled long enuff to slobber or wet stack... i don't think my '06 with the high idle would though.