isx cm2250 enigne brake

[Rawze]

Fault code 3253 = DPF Inlet Temp sensor is Above its Normal Range.

this can happen if it is in a regen and it goes too high .... OR ... If it is not in a regen and the DPF inlet temp sensor reads higher than the normal exhaust temperatures.

* Could be one or more of ...

* Bad, mis-reading DPF inlet temp sensor or wiring for it.

* The engine is letting oil build up on the face of the DPF and igniting due to excessive blo-by or leaky exhaust turbine on turbo.

* You have a leaky Doser injector.

* Bad Valve guide seals that are quite bad, allowing oil into the exhaust.

* Leaky injector, allowing fuel to get into the exhaust via the exhaust stroke(s) of the engine.

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* Will it pass an injector leak test?
<iframe id="lbry-iframe" width="560" height="315" src="https://lbry.tv/$/embed/isx-injector-leak-test-for-the-cm2250/e8187fb8d70f0f06388b597cb40751c5536d03dd" allowfullscreen></iframe>

* Anyone pulled the Doser pipe away from the turbo, cranked the engine up, and looked to see if it is seeping fuel from its nozzle?

* Anyone pulled the intake and exhaust piping off the turbo to see if turbo is leaky?

* Anyone replaced the DPF inlet temp sensor to ensure it is not reading incorrectly?

* Does it have an aftermarket DOC or DPF unit on it? .. If so, this could be the issue.

* Anyone pulled the DOC and DPF, taken detailed pictures of their faces, and looked to see what kind of buildup is on the face of each?

* Anyone checked to see if the decomp tube does not have the dreaded "Volcano" in it, partially blocking off the exhaust system? ref: http://rawze.com/forums/showthread.php?t...07#pid1807


* Any mysterious coolant losses?

* Anyone removed the turbo + exhaust manifold off after a 20-second quick cold-start, then shut down to see if any of the the exhaust valves (or inside of manifold) at one or more cylinders are wet with oil or fuel?


just some thoughts.