Cm870 demandated hot egts

[Rawze]

(11-10-2024 )Upnorth83 Wrote:  I’m still struggling with this engine tune. I’m working on purchasing Cal?erm so I can copy the tune out. I put a {aftermarket} twin oil cooler on it and oil temp runs around 210 now gets up to 225 on the hills. I thought it was going good. Then as the weather has cooled off in the last two weeks my boost has started jumping all over. Up and down. I had a copy of insite on my computer but it has disappeared. So I am working on getting that back as well. When check engine comes on it derates and sucks the life out of it. When I’m pulling and the engine light starts flashing off I lift my foot and go back in to it everything smooths out for a minute boost jumps to 40 41 and everything gets smooth and quite, lasts for about 3 seconds then boost falls off and back to noisy and no boost. I’m starting to think this truck is going to be the end of me. I had read on here that there is a flaw in Cummins programming that causes this issue. I’ve bought some resistors to try and fool it by bypassing the intake air temp sensor. I have load tested and replaced every sensor and wire. It has to be something in the tune right?

there are so many things wrong with what you just said that it is not even funny. No wonder you have nothing but issues.


- Installing after-garbage oil coolers IS MASKING THE ACTUAL PROBLEMS INSTEAD OF ADDRESSING THEM AND BEING ABLE TO SEE THEM!!>... NO WONDER YOU GOT ISSUES.. YOUR TRYING TO BAND-AIDE ON TOP OF PROBLEMS INSTEAD OF FIXING THINGS THE RIGHT WAY!!!.

first of all STOP TRYING TO FOOL S$IT!!!... IT IS BEYOND OBVIOUS THAT YOU HAVE BAD GARBAGE PROGRAMMING!!!!.. AND 40+ LBS BOOST IS GOING TO KILL THAT ENIGNE IN A HURRY!. -- IT CANNOT TAKE MORE THAN ABOUT 37-38 PSI.. EVEN IF YOU WERE MAKING BIG DAMN POWER WELL ABOVE 600HP!!!

YOUR FIGHTING BAD PROGRAMMING!!! .. PLAIN AND SIMPLE!!!.

AND YEAH.. CM870S ARE NOTORIOUS FOR BOOSTING UP AND THEN FALLING OUT BECAUSE OF --- GUESS WHAT..---- BAD PROGRAMMING!. IT IS WELL KLNOWN.. AND NO IT IS NOT A SOFTWARE BUG.. IT IS SOME IDIOTS --- BAD PROGRAMMING!!!.

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your story is nowhere near unique.. it has been seen 1,000+ times on here... and I see more than 900+ bad delete programs per year that do those same types of things you describe.. most of them by those same big-name trash engine killing/tuning companies like the brand of garbage oil cooler you purchased.

SO GO AHEAD.. AND BLAME THE ENGINE ... for all the F$UCKUPSS$S THAT WEAS DONE TO IT instead of facing the reality that it is THE ABSOLUTE ENGINE ABUSE THAT YOU ARE PUTTING IT THRU THAT IS THE REAL PROBLEM!!!.

(Generic quote... Now the beer is talkin'):
It becomes obvious where the problems are, when you witness someone stick their hand in a blender while its running.. and then proceeding to blame the blender for their hospital bills, agony, and missing fingers, instead of taking a moment to think about what string of bad decisions that they might have made, either by their own lack of understanding, or from the bad advice of others, that got them to the issues where they are currently at.