Truck sounds weak at startup...??

[Dante04SRT]

I've noticed something the last 1/2 dozen times I've started the truck. Normally, I start the truck and a second later I get the "woooooooosh" sound as the turbo spins up. Same as every other 6.0 out there...

Lately, I'm not getting the woooooosh at all after startup and the truck's idle starts slower than usual and then builds up slightly.

Fuel pressure at startup is usually 50-55psi and batteries are brand new.

Ideas? Is this a sign of something wrong or is it possibly due to cold weather conditions?

[jesilvas]

Probably cold weather.
You could double check FICM voltages and then maybe try some RevX in your oil.
What kind of oil are you running.

[Dante04SRT]

Originally Posted by jesilvas

Probably cold weather.
You could double check FICM voltages and then maybe try some RevX in your oil.
What kind of oil are you running.

I'm running Delo400; Which, by the way, I'll never run again. The oil has been in the truck about a month, and the problem has just been noticed within the past two weeks.

Oddly enough, it starts like this all the time, whether the truck is ice cold, plugged in, or even after its fully warmed up.

[psd_va]

my truck does this every now and then and never was able to figure it out but since i got my tuner is happens less if at all. but i am curious what can cause this to