The oil temp sensor is also use to control fuel, and injection timing

 

Also just to throw it out there. Maybe bad fuel? Do you always get it at the same place?

 

I’ll check that one too thanks for the heads up.

I usually get fuel from two different stations depending on where I’m at in town. That is if I’m not traveling.

 

Southern Utah is one of my favorite places to vacation. Panguich has an excellent KOA to stay at and branch out from there to see Cedar Breaks, Red Rock Canyon, Bryce Canyon, etc. Last time I stayed there nearly 20 years ago now, at the time it was owned by a member of FTE and he kept the place up very nice.
So now I'm going to recommend that you get those up-pipes installed. You'll be surprised at how much of a difference they make with how well the engine runs.

 

Thanks once it warms up a bit I’ll probably ask for pointers on installing those up-pipes. I’m terrified of the work involved so I’ve been putting it off lol!

I was able to plug into Forscan this morning and everything looked normal to me but I’m still getting familiar with the different PID’s and such.

And wouldn’t you know it?! She fired up and purred like a kitten. I love the high idle feature of my Hydra I use it a lot.

I didn’t go for a drive I was busy trying to work my way around the software I’ll get there eventually lol.

 

Op said it's not building boost. Could the ebpv sticking/failing cause symptoms like this?
edit, just read where the ebpv has been deleted.

 

So when I first bought the truck I had the EBPV stick often and it experienced similar symptoms. I deleted it completely when my pedestal o-rings started to leak oil.

Still haven’t installed the resistor I bought from RiffRaff though not sure if that would make a difference or not. It has a soft code for it but no engine light.

 

I’ve never used a resistor. Shouldn’t be related to your concerns.

As I was reading your previous post my mind went to asking if you had bellowed uppipes, then you answered it like a couple sentences later. I agree with Kwik that this should be a priority. They (normally) make a big difference even if it’s not the root of your problem.

The reason I asked about how it improved as warming was to see if this might be a sensor type issue which changes suddenly or maybe something more mechanical with a slow change. Maybe leaking uppipes would begin to seal up as they warmed? But then again those should get warm really quickly so maybe not the cause.

Putting the data into a graph form will help see things that may stand out.

 

Thanks sounds good. I’ve got a long weekend coming up should give me plenty of time to log some data.

Thanks again fellas I really appreciate the help!

Andrew

 

With my auto truck(e99 but not much e99 stuff left on it), I have always found it to be sluggish when below freezing, fresh transmission fluid, modified vb, and a better converter helped. The tuning does for the most part seem to pull a good bit of power out until the transmission fluid temp reaches 100* or so. (Can vary by tuning/tuner) the converter lock schedule is also altered (unlocked more) to help it build temp.
I wonder if the above isnt some of what you are feeling.

Leaks in the up pipes could also be attributing to it.

At the miles it is at, the injectors could be starting to show their age as well, but I do not suggest just throwing parts at it right away.

 

I wonder if the factory tune may have a part to play in this. My 550 has the VXY2 edition and I've never had a power loss, even well below freezing, temperature gauge pegged out cold. Engine pulls strong from freezing on up.

 

Thanks again for the reply’s. So I probably should have mentioned earlier my truck has a ZF5 in it so I don’t think that’s factoring into it much.

I’m running a Hydra with the free tunes. I typically use the high idle and 80hp tow tune. That’s all I’ve ever tried so maybe I should experiment with different settings…

I’m stuck here at work when I’d rather be playing with the truck lol! Could be worse I guess

 

Does it act sluggish when you have the hydra on the bypass mode and running stock tune?

 

They’re sluggish at all times with stock tune.

 

I just fired up my 2000 ZF6 truck and the ambient temperature was ~35°. I am tired of the cold and we are doing our best to send it back up north toward NY, where it belongs...

Anyway, I was moving the truck from the covered storage where it sits for the winter. I could see my breath in the shaded spot when I was climbing into the truck, so it was likely colder than 35° internally to the engine. I used the manual GP switch to fire the GP's for ~15 seconds and started the truck. It fired right off and I let it idle for ~5 minutes since this is the first time it will have moved since October. I'm pretty sure on that date, it may be late September, but somewhere in there.

As I rolled down the hill in neutral and settled on the culvert over the creek in order to head up the hill, I put it in L (1st for SnuggleTough) and let it roll up the hill. I opted not to use 4x4 and it paid off this time. The hill is a bit steep at a good 30° angle and covered with grass and partly moss due to the shade trees. The truck was very lethargic since it was very cold EOT and ECT wise, so I just let it idle up the hill with a bit of feathering of the skinny pedal until it was on pavement. Then I stopped and shifted into 1st gear in order to slowly drive up to the country road and turn around.

Like Andrew, I only use PHP 65 HP (free tune as he described it) and a 1100 high idle occasionally. Those two tunes are the only ones loaded on my Hydra and they are used for all forward motion being that towing 12,000 lbs or no load at all.

My point being that the truck is a completely different animal when it is cold. Andrew, I am not discounting or or disregarding your description of how the truck is running, but perhaps you are just noticing the cold and effects it may have on your EOT, ECT and the overall running condition of the truck. If there has been a marked change or degradation in performance that we are just not able to see or feel like you, a couple of data logs will help us get your truck sorted out.

We look forward to any updates you may have when you have been released from work obligations and can go play with your truck.