Posting about the 06 in my sig. It blows an abnormal amount of black smoke, particularly around 3/4 throttle. Not only does it blow out smoke, but the motor gets real rattly. And it most noticeable around 2k rpms.

I haven't had the truck long so I don't know its history. It has almost 170,000 on the odo. It has a clean air filter, fuel filter and I have ran some Howe's through it with no help to the problem. I'm tired of driving looking through the rear view to make sure I'm not blowing smoke all over somebody. Any body else experience this?

 

Sounds like one or more injectors are failing to shut off the flow completely between cycles. Fuel igniting at the wrong time causes the noise and too much fuel causes the smoke.

 

I have had the 06 in my sig since new and when stock my truck would smoke a lot especially around 3/4 throttle. It was embarrassing because I wasn’t even trying to hot rod it, just merge with traffic. A load would clear it up some, but not much. When I put the twins on with new exhaust and intake the smoke disappeared completely and EGT fell a lot. I was on stock programming and fuel so I wasn’t even spooling the big turbo. I got a smarty to spool the big turbo and some of the smoke returned but the turbos clean it up well.

 

Boost leak?

 

sounds just like mine. mine will clear up after a bit tho. if you do like me and dont get on it very offen. than when you do. it looks bad. i can black out the cars behind me but after a few wot runs it clears up.

 

Mine is just like ripping r stated above. Also I think that soot builds up in the CAT and when you do a WOT it helps cleans it out as if I do 2 WOT with in an hour the second WOT I get very little black smoke thus I try to do a WOT once a week. The only thing I know that will keep it down is to work the truck hard every day.

 

I don't think it's a boost leak, I've dealt with those in the past, on a different truck. It also leaves a haze you can see at night under normal driving. And if I do a couple wot runs, the initial cloud isn't nearly as bad, but the haze never goes way, along with the rattle.