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Old 07-06-2012, 09:11 AM
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Consistent Miss

So my truck is at the mechanics right now. It has a constant/consistent miss. I have searched long and hard and have not found a similar problems (lots of threads on missing but not like mine)

The truck starts up just fine and seems to idle ok (it is missing but is not running super rough). There is a constant poof of black smoke coming out the exhaust when that cylinder hits. It does not change at all whether the vehicle is warm or cold. It drives fine on the freeway but puffs out black smoke every time that cylinder hits (that makes for a smokey ride). No lights or codes

They took out the injector and put new o-rings on it and that did not help.

I am not a diesel mechanic so I am sure they said a lot of things to me that I did not understand. I believe they switched out the injector for the one next to it and it did not change anything. The same cylinder was still missing... But lets assume that did not happen because I could be wrong. I am going to go down there in a couple of hours and talk about the different options and I want to go in a little more educated when we start making decisions.

any ideas
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Old 07-06-2012, 09:13 AM
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Could be ficm, even if it is showing 48v.

Sent from my SCH-I500
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Old 07-06-2012, 09:17 AM
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would a ficm cause just one cylinder to miss like that? I will search really fast and learn everythign I can about the ficm... is there any other way to test the ficm if it is showing 48v?


Also does anyone have any explanation to me as to what is going on... what I mean by that is with the black smoke coming out consistantly does that mean it is getting no fuel, too much fuel, no compression, etc...

I am curisous as to not only what the problem is but what is going on inside the cylinder. I read lots of posts about puking black smoke or constant smoke, or even white/grey smoke but i don't see many threads about constant puffs of black smoke
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Old 07-06-2012, 09:44 AM
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Because you said they swapped the injector and the same was missing, that is why I think ficm. Not sure on the other checks, black smoke means overfueling.

Sent from my SCH-I500
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Old 07-06-2012, 01:25 PM
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thanks for the replies...

bump for any other ideas before I head down there...

I am debating and being pressured at the same time to do the arp studs, egr delete, take the whole engine apart down the the last bit, clean and replace as needed and then put it back together...

but i wanna make sure that this will take car of my problems
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Old 10-06-2012, 05:50 PM
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Ever find out what it was...mines kinda doing that, can't see smoke so much, only when it starts.
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Old 10-07-2012, 02:30 PM
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I should have posted this up a long time ago but I guess it is better late than never

My consistent miss was caused by a hole in a valve, a melted piston, and scarred cylinder wall

Here are a couple pics



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Old 10-07-2012, 02:45 PM
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I ended up getting another low mileage long block and starting from scratch. Built it with head studs, egr delete, new oil collar, cleaned the turbo, serviced all the injectors, lots of gaskets and seals, and stc high pressure oil fitting.

Wow it is like a whole new truck now!!! Don't wast your time and just get it done right!!!
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Old 10-07-2012, 03:01 PM
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Hahaha, wow. Hope that's not my problem, how did it start? A bad injector can cause that, as well as just crzy excessive heat from a tuner or something...Cummins do it all the time. We've rebuilt em like that before. Pita.
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