Eratic low boost with cold temps

[KDillard]

:{ Since it got bitter outside here in the last couple weeks I have notice that the boost is around 20 psi at full throttle. Also when its warmer out the boost will go back to the normal 32+ psi. Anyone else having this issue?

 

[RankRam]

It sounds like the fuel may be gelling to me.

 

[Diesel Thunder]

Yes, I have seen this on my 05 as well. When its warm, boost will spike at 30-33 then settle at 25-30. Now when its cold, it spikes at about 25 then settles at 22. I really don't think its a gelling problem since I have never had a gelling issue before and I run Primrose 409 additive which is supposed to lower the gelling point of the fuel.



Anyone else?



Diesel Thunder.

 

[Diesel Thunder]

After submitting my previous post, I got to thinking that it could possibly be an air density issue because as air gets colder it also increases in density. I don't know, maybe the ECM sees the higher air density and wastegates the turbo accordingly? Someone with more experience will chime in.



Diesel Thunder.

 

[SP Diesel]

Your MAT (Manifold Air Temperature Sensor) is telling your wastegate to open earlier since it is colder outside.

 

[mattymac]

Your MAT (Manifold Air Temperature Sensor) is telling your wastegate to open earlier since it is colder outside.

MAT or IAT? (intake air temp sensor on the intake tube?)

 

[SP Diesel]

Our experience has shown the MAT (the temperature portion of the combo boost/intake temp sensor on the manifold) can cause the wastegate to open when the temperature is below a certain point.



The IAT sensor may also cause this, but the MAT is where we have seen it happen.

 

[bagd99dak]

my 05 does the same thing. spikes around 32 when warm out and settles around 27-28. when its cold out, say below 30 degrees it spikes barely at 30 and settles in mid to low 20's. second winter i had the truck and has not changed any.

 

[KDillard]

I have an Edge Juice with attitude. Been thinking its an issue with the box. I thought I was supposed to boost fool?

 

[SP Diesel]

Boost fooling or a "boost fooler" may not actually help this situation.



We have a wastegate controller that we will be coming out with soon that will give you complete control over the wastegate on 04. 5+ trucks, and will make this problem disappear.