high pyro temp/low boost/weak engine brake

[Rawze]

(09-24-2022 )ILfarmer89 Wrote:  ...
It does have an adjustable fuel pressure harness on it
...

You need to yank that fuel-pressure sensor fooling device off of it ASAP and throw it in the garbage can!!!!!.

The ISX CM570, CM870, CM871 model engine fuel pressure is 100% mechanical.. and the computer HAS ZERO CONTROL OF THE FUEL PRESSURES!!!.

THOSE FUEL FOOLING DEVICES ARE A SCAM.. And all they do if royally f#uck up the injection timing badly and fuel quantities into the cylinders, creating a ton of excessive internal engine friction, seriously shortening the engine life!!!.

They also destroy engine cylinder balancing and the ability for the engine to maintain a proper fuel-air-mix.

The engine computer can make whatever power/torque/efficiency trade-offs that someone desires ... PROPERLY and without shortening engine life.

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Unplug the egr valve and see if it gets a CEL light. If it does not, then take it to a dealers$ip and have the correct program flashed back into the engine. CM870 does not shut down if it has been de-mandated.. it will only have CEL light for whatever got unplugged. -= at least this way you can iron out all the problems and get it running right while the correct factory program is in it before moving onward.