Cm871 code 2637 and 4214

[Rawze]

At some point in the engines life, no matter what you do, you will not keep that system happy. 700k is commendable to still have that system in place, but at some point you need to ask yourself when is enough suffering going to happen before you take it to Mr. Hag, Unilevers, or Gearhead and have the problem solved permanently? -- That or start replacing injectors and a lot of other components / possibly an in-frame it to try to make it happy again, but even that has no guarantee.

Those CM871's are the absolute best engines that cummins has ever made so far. -- that is,.. when you get rid of those problems once in for all, but until then,.. They eat themselves alive and are nothing but emissions system headaches.

Hopefully, it has lived most of its live with a bypass filter on it to reduce the soot levels and save the internals,... but most people don't bother and/or are too cheap/lazy to install them until all the damage has already already done. If yours don't have one, I feel sorry for your engine.

By the way,.. just because the oil is not going out of the engine at a fast rate does not mean it is not worn out. the crank case filter catches most of the oil from blo-by and it will fool you big time. - I have seen engines with more than a million miles on them go form 0 oil consumption to using a gallon every thousand miles simply because someone relieved all the back-pressure problems in the exhaust and drilled out the crank case filter, it suddenly revealing the actual wear in the engine.


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You own a truck where 60% of the engine is a computer, yet you have no way of working on it because you have not bothered to get yourself a copy of Insite to keep after it with. Personally, I would have gotten that software the same day I purchased the truck. It would have saved you thousands and thousands by now. -- Not having the tools and equipment to maintain and operate your equipment in cost a effective manner is simply bad business planning if you ask me.

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Have you done an injector leak test on it?

Do you have a bypass filter on it?

What are your oil samples looking like? -- Soot levels?

What are the blo-by levels?

Boost and pyro readings?

Did you ensure it has the correct program in it? -- You said it was upgraded,.. but many times someone will put the wrong program in one to ehemm--- "up the hp" and that in itself many times will contribute towards emissions system issues too.

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Get Insite.

Get that thing down to Mr. Hag in atlanta and get it taken care of once in for all.

Hope that when all the problems are revealed,.. that it does not result in an inframe, because its comming. --- Very very few CM871's make it past about 900k miles max before an inframe.


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You have the best model of the best brand of engine made since 2007, but it will only ever be that way if you take the steps to make it that way. From the factory THEY ABSOLUTELY SUCK OTHERWISE!>.... You keep driving it like that and letting it fall apart around you, all you will accomplish is that you will be chasing the tail of the dragon that is does nothign but eat its asse alive. No one can tell you to get rid of that mandate, you have to decide that, but I can say that it is absolutely shameful not to, especially in that model engine, knowing that very system it the thing that has put most owner-operators out of business.

Performing EGR tune-ups works great when the engine is not very old and worn down yet,.. but nothing helps after the engine has suffered several hundreds of thousands of miles of that soot eating, exhaust restrictive crap system on it. That tune-up is great, and if it gets you going,.. even better, but Keep chasing it in a worn down engine and you will find yourself in the poor house in doing so.