CM871 Slow Climbing Regen Temps

[Rawze]

(03-30-2016 )Taco05 Wrote:  When you say engine damage what do you mean specifically? Not enough exhaust pressure, too much blow-by? The pressure we are talking about is the actual pressure drop across the DPF Filter (change in pressure before and after DPF) which should not go about 3 inHg. So if the filter is really clogged and past the point were a forced regen can clean it out would't it show really high numbers like 8-9 or am I missing something? Last regen finished good in about 45min and differential pressure code went inactive, soot load went from least severe to normal but 30 min later it was asking for another regen. I will see the truck today and get all the numbers again including the turbo specs which I am suspecting the most since I have not changed it and it is red which might be the original equipment but the actuator has been replaced.

Ever see a car with a blocked up catalytic converter? -- Car runs fine mostly (for a while anyways), but the exhaust manifold will glow red.


After a forced regen it should be BELOW about 1.8 or so max. Otherwise it did not perform very well, and it will ask for it again in short order.

What you should be seeing is a forced regen about 1.2 - maybe 1.5 or so, but realistically, it will typically be BELOW 1.0 aon a good DPF system in the history after the forced regen. -- And a history after several days should be an average of BELOW 3.0 -- if it is running higher,.. you have some problems there.

You said it is showing a history of 8+. THIS IS VERY BAD! It should not be more than about 3 or so max on average. If your getting 8's on the history,... it is costing fuel mileage and the higher it reads on the history, the more it is showing that it is creating excess heat buildup in the engine. High numbers like that can cause a lot of engine damage in short order. Here is what can and will eventually happen to it...


* at 8+ and 9+ all the time ----

* Cook the injectors and cause them to leak, become weak, and start to go bad. This will also make it run a bit rough at idle after someone does this.

* Eventually start to make cracks in the top of one or more of your pistons. Then they/it will fail several weeks to months later even after the problem is fixed, when the exhaust gases finally drill holes through them to the bottom. You cannot know this is happening without boroscoping the engine a couple weeks AFTER the problems have all been fixed.

* Cause a cracked Intake or exhaust Valve.

* It can contribute to and/or cause the engine to drop a valve, damaging the head severely.

* Crack the head.

I.E. -- Damage

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Stuff up the exhaust in ANY engine and see how long it lasts. It is very real.