05 CTD Rough Idle
 

I occasionally get a rough idle and the engine doesn't feel near as smooth. It's very random and only lasts for a drive or two even. I shut it off and sometimes it will stay for another drive. Most of the time it's gone.

Really weird. The dealer said they can;t do anything unless they see it acting up. So far no codes no CEL nothing.... What's the deal? Anyone have similar issues?

I run powerservice/mmo every other tank sometimes every tank, sometimes every 3rd tank.) The mechanic there said that's ok and sees nothing wrong with that stuff. I tried a couple other products also. Stanadyne and one other. But no changes really.


Just odd..

I know exacty what you are talking about. Sometimes the engine just seems to run a lot smoother, and sometimes it shakes more than I think it should.

Mine does the same thing, it did it before I started mod's and it does it to this day. I must say it really gets old quick, and I have no clue when its going to start, or stop idleing like sh*t.

I have had the same problem. Kind of a lite missfire. Comes and goes with no rithym to it. Have'nt been able to pinpoint it yet. Could be carbon build up on an injector, fuel, temp, lifter or a valve. It runs fine off idle with no added smoke so I don't think its in the valvetrain.

Mine does the same. But doesn't stay around long enough for me to worry about it:cool:

Michael

sounds like carbon'd up injectors.

change the fuel filter, fill the filter canister with seafoam, prime the system run the truck for 5 seconds, let it sit overnight. then with 1/4 tank of fuel add 1 bottle of howes meaner cleaner and either pull something heavy or drive it like its stolen.

A good cleaner
 

I agree with Redspider.

Even just a can of SeaFoam in a half tank of fuel may
be enough to do the trick.

I don't tow or work my truck like it should be worked
so I like to use some SeaFoam every few months just
for preventive maintenance.

Only got 31,000 mi on mine but so far no problems
with running rough.

I drive mine like I stole it all the time. So I don't really see that as an issue with mine but like I said it doesn't happen often enough for me to worry about it.

Michael