Pete with Acert derates no code

Op said he had the truck on cat et while it was darated.... I would think you would have seen some evidence of the problem ....

My main man asked are you sure if it's a derate or is it a mechanical issue that acts like a derate..?

 

That is what it feels like when you lose an intake actuator. Actually, mine was the wiring harness in the head. Mine did come and go.

 

No ....

But if the aftermarket software isn't allowing the code to be logged I would think the derate wouldn't happen either....the ECM wouldn't see the problem or react to it.... She would run till it blows sort of speak.

I say this with peace and love, a lot of people blame the software upgrades right off the bat. And that may or may not be the problem....

My thought would be put it back on cat et while it's doing it and check the values on everything and go from there....

 

Not all upgrades turn the vvas off.....

 

You're not the only one on this forum with this problem. It's reported to happen in 15 liter and 13 liter acert engines.
I have the same problem in my 13 liter, engine prefix is kcb,for five years now. Most of the time it's derated when the engine starts at higher idle due to colder ambient temperatures. During the warm up it builds only 28 psi. The oil temp has to be at or above 200F and the coolant temp needs to reach the point where the thermostat opens. Then in most cases it picks up boost. If I run on flat ground, where there is no need for the engine to boost up to the 28 psi, the engine just warms up and runs fine.
In colder temperatures, when it takes longer to warm up, sometimes the CEL comes on. It seems like it's running a bit rough before this happens. The turbos seem to have a bit of a different sound, like they're singing the same song but on a different page. In this stage, there are only two things that solve the problem:
Get the Pyro temp up to 750F, which is difficult in the cold with a dereated engine. Second option is to shut down the engine and restart.
The CEL does not leave a trace in the ECM why this happened.
During those fife years the following repairs were done: upper oil pressure sensor replaced, platinum inframe, exhaust gas pressure sensor with pigtail harness and both turbos including wastegate were replaced.
Even when it suck most of the time, I just leave it.

There was a comment on one of the previous threads. This poster assumed the engines are too cold when put under load.
As far as I could figure out during a conversation with a service rep at CAT, there is no cold engine protection in the ECM which would explain the derate to me.

 

Be sure to check your coolant level and the sensor at the radiator. Low fluid level or a faulty sensor/broke wire will cause a derate. Been there with both low level due to leak and a broken wire to sensor.

 

Check the wiring going to the water recirculation valve on the precooler...its it sounds to me like it isnt recirculating water through preecooler which will cause slow warm up and low boost and low power. The wiring sucks to get at and runs behind alternator bracket and behind pre cooler near manifold.