Good morning to most of you,

I have an 06 6.0 yesterday morning the temps were at 0F with wind chills down around -20. I had the my truck plugged in started just fine. On the way to work it accelerated just fine when I drove nice and easy never noticed any issue. I got on the highway and noticed when I got after it on the accelerator it would bog down at almost 3k RPM and didnt want to shift or accelerate. Im running Rotella T6, OEM fuel filters that are changed every other oil change and Innovative extreme street tune with MBRP exhaust. My boost gauge was giving me good readings fuel pressure gauge was showing around 68psi at idle and only dropped to about 64ish on regular acceleration. HPOP was worked on about 6 months ago and all has been well. I forgot to add power service the last fill up but always keep tank near full when its this cold and plugged it. I havent hooked it up to look for codes yet. Any ideas? Gelled Fuel? I wish this weather would go away but it doesnt look like its gonna get above 10 for the next week. F****** northern Illinois weather.

 

What was done to the HPOP - STC fitting?

Do you have a way to watch the ICP values and IPR % duty cycle?

Maybe drain some fuel out of the HFCM and see if it looks gelled ........ although it seems unlikely that it is if you have good fuel pressure. Gelled fuel is hard to push through the primary filter.

 

Im sorry I dont have the ability to monitor those values. Yes STC fittings were done on HPOP after it had cracked the rear cover.

 

Cracked rear cover - Ouch!

Can you drive it to an Auto Parts store and check for codes?

Hopefully someone else can give you a few more ideas, but if it isn't fuel, then I would think that you need the scan tool to check the HPO system.

 

Ok thanks Ill prolly get it scanned and if that turns out ok its on to filters to see if that helps. Think Diesel 911 would be a good start?

 

Personally I don't like it because of the alcohol content, but sometimes it seems that it is the only thing that helps if the fuel is already gelled.

 

Ok Im trying the cheap fix first, Diesel 911 and some Winter Power Service Ill see what it does. Ill keep you updated on the scan my buddys is gonna come by with his scan tool and check out IPR, ICP, FICMv for kicks and see if im throwing DTCs. Thanks for the input so far bismic anything else I should be checking while hes here? Any chance it would be EBPV and if so would is that something I would notice by sound?

 

Since your boost seems fine, I would think that the EBP sensor would not be likely.

Have you tried running it w/ the ICP unplugged. Not sure if that would help or not, but worth a try I suppose.

 

I guarantee that your fuel gelled. Im in northern il and my truck did exact same thing yesterday. Had the same prob during the last cold snap.Conditioner and 911 have not helped me at all in these temps.

 

Another vote for a fuel gel problem. Try pulling your primary (lower) fuel filter and look at the element. If it is gelled up or the element covered with a thin layer of wax, you just found the problem.

The fuel filter can be re-used if you can get the wax/jelly off of it. I'd just install a new one.

Treating the fuel is a must. Adding some #1 diesel (kerosene) to the fuel tank work great. A 20% #1 diesel concentration should be good down to 0 degrees. We are at the mercy of the place where we purchase diesel fuel. If they are selling summer grade stuff, fuel treatment will not cure the low temperature gel problem. It was -15F here and many of us saw gel problems just like you are describing.

Lou Braun