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EngineEer

So I have a cm2250 deleted cant wrap my head around if the ecm is failing or im missing something simple here

The jakes are choppy/weak right after a long pull, oil @ 230-235 degrees, and oil pressure seem to drop to 30-33psi when jakes activated. I need to manually fan on to cool the oil down to 225 or less and then my jakes are strong again

I change oil 250hrs conventional 15w40 rotella, it does seem worse when i get close to 200hrs on my oil (oil breaking down)?

So far
-new crank and rod bearings, and new oil pump OEM cummins parts. That got my oil pressure back to normal 35psi spec, when warm at 235 degrees. Was about 31-33psi with old bearings and pump at 235degrees before
- new wiring harness and solenoids in the head - OEM Cummins parts
- wiring checked good at 0.1 ohms from passtrough connector to ECM for the 2 jake solenoid
- new ground terminals next to ECM
- installed a rebuild kit for jake heads with new spool valves and springs… same issues
- swapped another set of full rocker shafts/levers/jake heads from another truck… same issues
- new exhaust back pressure sensor and wiring tests good
- no boost leaks and no exhaust leaks

Any ideas? Im wondering
- bad ecm (drivers for 12v for the jake solenoid are failing)?
- oil thermostat failing, cant make up its mind on being open or closed?
- injectors leaking a small amount after pulling
- havent tried new switches for engine brake, but its good on the scanner, 100% engine brake level , and switch ON at all times. Maybe I should try that

When it does get choppy i have seen driver solenoid #2 switch from on to off randomly on the scanner a few times, and solenoid #1 stayed consistent ON.

Would love to hear some ideas. Ive read some other posts on here about worn rockers shafts but i dont believe its the case for me here

mikkhh

You mention deleted and oil temps high. These two might be connected - former causing latter.

Was the delete done by somebody who can be trusted and knows what he or she is doing?

Have you pulled file from ecm and sent it over for a review? It would be the absolute first thing to do before replacing wiring harnesses, injectors or tearing into engine itself.

Read this to get started -
https://rawze.com/forums/showthread.php?...5#pid72945

Rawze

How do you know for sure that some complete clueless yahoo did not jack with the engine brake settings in the de-mandate program that they made for it?... This is a Very common mistake, and its very dangerous for the engine.

Start by copying the de-mandate file from the ecm to have it properly reviewed. for all anyone knows, the damnned thing could be trying to perpetually generating heat, to try to warm up a DPF can that is no longer there.. a VERY VERY common problem with improperly de-mandated engines.

info: https://rawze.com/forums/showthread.php?...5#pid72945