I went to start my truck this morning and had a little blue smoke and a slightly rough idle for a couple seconds then everything cleared up. This is not the first time this has happened and this is not the first time I noticed something strange. Normally when I turn the key on the fuel pressure jumps to 10psi then back to 0psi and once the truck starts it returns to 10psi. The two times I have had the rough idle at startup the pressure went to 10psi when I turned the key on and stayed there. Anybody else with a fuel pressure guage ever notice this? It makes me wonder if there is an injector intermittantly stuck open and the computer senses that the system is not fully pressurized so it keeps pumping fuel, in turn dumping fuel into that cylinder which causes misfiring, the rough idle, and smoke......

Just a thought.......

 

try some fuel treatment and run the truck very hard for a little bit. I would keep a close eye on your oil level. I fit is sticking it may build up pressure and lift the injector and fill the crankcase with fuel.

 

My 06 did the same thing at times along with long crank times, got rid of my XTZ which solved my rough idle. Then I got a new ECM which solved the long crank times and made the truck run smoother and quieter.

 

I run additive all the time. Lots of guys are having this issue with the newer trucks much worse than me. I was just trying to offer a hint as to what part of the problem may be...

 

I've intermittently had that issue as well. However, I don't have a fuel pressure gauge so can't report what the pressure is doing. Hmmmmm......maybe a good reason to get a set of gauges.

Mine usually does it after a few days of not being driven.

 

Mine shows 10psi with key on - drops to 0 while cranking - then back up to 10 when running too. The times I saw blue smoke I also noticed the pressure remained while cranking , that was just after I installed the Quad Std box. If you remember back a few months, I posted some concerns about timing noises being louder, or more rattle than before I installed the Quad. I dumped in some additives for a few tanks of fuel, then went back to no additives for a few tanks of fuel. I wanted to see if it was the ULSD causing the problem and IF additives solved it, then went back to no additives to see if it returned. I did not have blue smoke, I did not have more rattle during the time running the additives. Since returning to just ULSD I have not had blue smoke or the rattle either. So, beats me??? One thing that could have also been a factor was colder temps and more humidity during the times I was experiencing the blue smoke and the fuel pressure stuff. We have been having higher humidity lately, but still no changes thus far. I also considered the fuel pressure stuff to be injector related, but it could also be an ECM issue too. How to narrow it down is what I was having problems figuring out. No fuel in the oil (yet) right on the same mark every time I check it.

I wondered if the Quad box had something to do with it since our computers learn our habits, etc and if for whatever reason the computer had to learn about it's presence in the scheme of things???

CD

 

I will get a egt spike some times upon a hard start also. I concur with what you are saying about the injector stays open and the FP goes down.

 

My FP gauge usually reads about 6.5 when I turn the key on.. On very warm days it will start at about 9 when I turn the key on. My smokey- misfire startups are by far worse on the cold days.

To be honest, I pay very little attention to my FP gauge because I had a LP failure once already at 30k miles and the FP gauge gave no indications whatsoever of the impending doom. As I said, some days I have more FP than others for whatever reason according to the gauge. I'm not sure that the FP has much to do with anything as best I can tell. I think it has something to do with either colder weather or leaking injectors- or both.

 

I do an oil analysis with every oil change, no indications there is an injector problem, no fuel in the oil. When I got the new truck I read a lot of posts about injector problems, considered that they could stick open, and thought that doing the oil analysis would be a smart idea, it would serve to assist in any warranty issues as well. I am also faithful about dumping in injector cleaner. Knowing that these boxes DO add pressure, watching the oil and possible fuel in the oil seemed an important must do.

CD

 

I usually have problems with my truck when it's very cold outside. I have no gauges, but when it fires up, it shudders, stumbles, sputters for a few seconds (sometimes approx. 20-30 seconds) and then shoots straight to high idle. It sounds like an old tractor! It never does it whe warm, but when it's warm, sometimes I notice a little "sneeze" just after starting. Anybody heard of that??

 

Yup I guess that the symptoms are injector related. Must be the third injector event on a cold engine with a slight carbon build up on the tip. You guys have got to get some better fuel filtration and pump pressure, at least 3 microns and 15 psi. Dodgezilla, whats a 2017 Whyte Doolley 4300 Lariat 4x6 Cummings? . Are you missing the 03?

 

Ar yuo making funn of my pour spilling???????
I just got tired of looking at the sig with all the mods in it. My truck is almost back to stock right now too..
The 03 was a great truck but that trans just wouldn't shift right under part throttle and I could not stand it! It was something to do with the computer and nobody could figure it out. I definitely prefer the new 6-speed but my leg gets tired in the traffic sometimes.......

 

I have debated on adding some type of pump like FASS or RASP since I bought this truck. I'm not sure it would do much for the smokey startups though. I'm still not convinced after 3 years that adding some form of aux. fuel pump is actually worth it or not when the cost is considered.

 

^^^^^ I would respectfuly disagree with that. After starting my 04.5 with a stock lift pump for 2 years wondering if today was the day it was going to give out. I put on the GDP Walbro kit and the speculation went away. Yes, I know that no electric pump (or any for that matter) is guaranteed not to fail, but piece of mind and constant 18 psi make me feel tons better. And for me, that's priceless.

 

Got to recognize that Bosch, recommends for the high pressure common rail system 5 microns or better. DC refused to acknowledge that. Can't post a link as it is dead now. The stock filter and pump are a marginal system. Yes it will get you by, maybe, but I prefer long term.
Dodgezilla, i can't believe your driving a stock fueled cummins. Sure you don't want at least a smarty