2006 5.9 with part time rough idle

[SSwords]

Ok I just got my truck back from the dealer and they said no codes no problem. I take it do not feel any thing until tonight when I got off work when I come to a stop it has a shake through the whole truck. It reminds me of my old 350 chevy when the plug weirs fell wiers the headers. I am a mechanic and I know that their are more test to do than the codes. (I used to work for the dark side ford) My dad has had 4 injectors bad (not at the same time) and never set a code. I have replaced lot of injectors for a missing problem by running a power balance test or injector buzz test. Does dodge have any thing like that? I tried to take it back to the dealer but the diesel guy was gone for the day. #@$%! So I drove it home and made a couple of stops and it was fine but I started it to put up for the night and it was right back at it. It is not overfull on the oil the air filter is good no chips for 4 months now(had a idler pulley go out so I pulled every thing and was to lazy to put it back) and 16750 miles on it. Does anyone have a clue?

 

[daytripper63]

With all the people haveing rough idle issues lately (including myself) I am starting to think it may be this new crappy fuel

 

[AllianceDiesel]

you got injectors bad, how much do you idle it? how often do you change the fuel filter



I have done over 100 injectors for rough idle, the best way to see if you have an injector going bad is put the truck in neutral and run the engine up to 1750rpm range and see if it shakes the **** out of the truck, i usually have the door open to the first notch and it will shake the door bad. I have never seen a truck with an injector code, the other way to find them is with the injector kill test and either do the test in idle or driving down the road with a load on the engine and about the same rpm range you should hear a slight knock like the older diesels.

 

[SSwords]

not much idle time and every fall weather it needs it or not I change the filter and am using the good filter

 

[TWagers]

Alright I have the same problem. I also noticed in the new tdr magazine that the ticking may also refer to a dropped valve or cp3. I have also heard that the injectors could be bad. How do I determine which it is. I hope it is the cheaper of the three.

 

[Dan Simmonds]

mopartech - good info on testing injectors - I'll remember that, thanks.

 

[AllianceDiesel]

if you dropped a valve the truck won't run very well will probably smoke like crazy and it is very rare

 

[231jasonS]

My 06 5. 9 has same prob. bad idlefor about 5-10 seconds when i come to a stop from an extended drive then it clears up. It only does it in gear and only on a decent drive, like not stop light to stop light. More like 3/4 miole or more.



Ive noticed some more smoke at startup than i remember and some more white smoke from time to time.

 

[AllianceDiesel]

yeah that sounds like an injector too, the computer can't figure out the pressure to run the rail so it idles rough because at least one injector is bad, i have seen it when all the injectors were bad and you would just blip the throttle and it would idle at about 2200rpm and stay there until the computer could get the fuel pressure down,

 

[231jasonS]

When it happens i watch the RPG and it dosent seem it fluxuate at all.



How would i confirm this is an injector problem? And how to figure which one?



I tried the test from post #3 and no shaking.

 

[JFought]

my 06 5. 9

Has a rough idle.

I can see the rpm gauge flux. from about 50-100 rpms. it shakes the truck, but with a little more rpm( 100-200) seems to get smoother.



I did the 1750rpm thing shakes a little.



Does this sound like an injector? I al so have the tick noise around1500 -1800 rpm while accel. light or moderate. 10-40mph traffic. .



Any thoughts. .

Thanks.

 

[SSwords]

I have more of the last post a rough idle and it comes out of it with a touch of the throtle and no shake after that I do have a little more tick on the mid range than normal but maybe just that it got warm and I got the windows down

 

[daytripper63]

I dont believe the problem to be injectors. I doubled up on injector cleaner on this current tank of fuel and now I have only had a semi rough idle a couple times instead of nearly all the time and everything seems to be smooth now at idle and it was always smooth above idle, now this week I will get my FCA changed and that should take care of my occasional high idle.

I think this new fuel is crap, I have ran Stanadyne fuel treatment since my truck was new and never an issue till this new ULSD fuel. Maybe it is something with ULSD and fuel treatment mixed together that causes the problem? maybe some kind of gumming up or something. I am running 2 bottles of straight injector cleaner and it seems to be working.

 

[AllianceDiesel]

well if it clears up after injector cleaner than pretty much it is injectors, what happens is when you idle the truck, the cylinder temps drop and then the fuel doesn't completly burn. This, unburned fuel is carbon, that will eventually make its way up into the injector and can cause the injector to stick open, thats why they say never idle a common rail truck more than you need to.



My suggestion to everybody with problems, run some good additive and injector cleaner and drive the truck like you stole it, also don't idle it unless you are cooling the egts, pretty much drive it like it was a gas vehicle.



I agree ulsd is crap, its just like etanol, its a tree huggers way to find something to whine about, but you can't tell them anything about fuels because they either drive electric cars or walk (where do you think they get that electricity for their cars?, most of it comes from coal, and most of that coal comes from wyoming which has to be shipped by railroad which uses diesel, so the more coal they use to make electricity, the more diesel they need to move it)



rant over

 

[SSwords]

Ok it is back I have left my truck set 3 days and when I started it up it run like c#ap and smoked blueish untill it burned out all the fuel that leaked off (thats what it seemd like at least) I have not had a chance to check the oil after it cooled down a little bit to see what it smells like. I am going to another dealership I told them that I will drop it off and let it set all week so they can see what it is doing. Mabey this dealer will see the problem. I took it to the other one 3 times now and they keep telling me no codes no prob I hate that. Ok now I feel better Why do dealers do that stuff.

 

[TBland]

I guess I get to jump in on the rough idle bandwagon. I had a rough idle when the truck was warm only & as soon as any RPM was increased, it ran smooth. Now, magically the rough idle is gone, but the truck idles @ 50-75 RPM higher than normal. New FCA, Stanadyne used, good power, no injector noise to speak of

 

[AllianceDiesel]

Dealers do that because the techs aren't trained in cummins or don't know how to work on them. There are some occasions where you do have to say that because you can't get anything to show up wrong or none of the tests will show anything but that is rare.

 

[JWaugh]

i have had a problem the same as the rest of you have had with intermitent ruff running whether it is at start up or just driving down the road. i change my fuel filter on a regular basis and always insure that the filter housing is drained and clean. the way i found my problem was when i would start he truck when it is cold and was running ruff i checked the individual cylinder exhaust temps with a heat gun and found #6 cylinder to be almost 100'f colder than the rest (not firing). i took it to the dealer and they said there was no problem until i demanded they remove and inspect the #6 injector and bench test it. by the end of the day they agreed that the injector was faulty and installed a new one. the then stated that it was caused by water in the fuel and that the filter was full of water!!! this is when i proceeded to tell them that i changer the filter only 1 hr previously to taking it to them and stated that as usual there had been now water in it. they then said i would have to pay a couple hundred bucks to have the fuel tank dropped and the water cleaned out at which point i demanded to see the branch manager and stated to them that if they pull the tank i will be present and if there is no water they would not be being paid needles to say it got ugly for a bit but ened up that the mechanic working on the truck was just trying to cover his ***** for not being able to troubleshoot the truck. in the end i didn't have to payanything, and there was no water in the tank!!!so to make a long story short stick to your guns if you know what you are talking about and don't let the dealer feed you a bunch of crap!!

 

[SSwords]

I got my problem to show up agian and I just kept on it and finaly got a code to set and got #1 and 2 injector replaced.

 

[EDankievitch]

Guess this is progress... ... . Cleaner fuel now the injectors fail... . How I miss the old days when the fuel was full of sulpher and things were mecanical and every where there were two stroke detroits ... Lol.

Na, we just need to all be burning Biodiesel-B20, The biodiesel cleans the fuel system and provides better lube than ulsd ever can. and it even cleans up the exaust emmisions.