Ok update.
After the synthetic oil and new filter it is 4 degrees here this morning less than that thru the night. Truck not plugged in figured it was a good day to test cause I didn't need the truck. Let the GPs run a full cycle then again the length of time the fuel bowl heater runs. Hit the starter and started right up like it was 40 degrees.
I'm glad it started. But now at this point thinking something is causing it not to start if it sits more than a day without running?
Or if the synthetic oil is really the ticket.
Any thoughts appreciated.

 

Oil is a big thing at 4 degree's F. But I believe it should of started with the 15-40 also. It mitt romp but it should start.

 

My thoughts are that you might be having the begginings of injector poppet valves going bad. Synthetic helps but it won't last forever. If it is the poppet valves, depending on how much you drive it, you will need to start budgeting for a new set.

 

That's good to know. I will have to research the injector poppets.

I will ask but will look are these part of the injector or can they be replaced separately?
What kind of cash am I looking at roughly?

Thanks

 

One more thing almost forgot. Read codes today there was one stored.
I think it was a p1211. Maybe. Either way explanation on the scan tool was "ICP low or high"

I don't know if that is telling me anything or not.

 

There are people who rebuild the injectors themselves. There was a kit at one point, I don't know if it's still out there or not. The poppets are part of the injectors and will require a total rebuild in order to do correctly. As for cost, it varies depending on what you want to do. If you want stock remanufactured, stock new, or if you want a performance gain you have tons of options with new and remanufactured.

Alliant is who manufactures our injectors and a new set is going to run you about $1700 or so. I know pretty pricey.

If you are spending that much you can get a nice performance gain from a set of reman'd single shot stage 1's, stage 1.5's or Stage 2's if you have the supporting mods to go along with them, ie: gauges, better air intake, performance tuning (an absolute must have in order to get single shots to run well in our trucks), etc. if you don't have any of that, then stock is unfortunately, the only choice for you unless you want to add all of that first. There are lots of companies who build performance injectors, Rosewood, Swamps, Full Force, P.I.S.( I have their stage 1.5's).

Low ICP is low injection control pressure. There is a sensor on the front of the drivers side head that monitors this. It can go bad causing weird symptoms, intermittent shutting off, no start, etc. if you pull the connector and there is oil in it, it means it is probably going bad.

 

One more update with no help.
Let the truck sit since Monday afternoon. Started this morning at 22 degrees with no issue.
My hope is that if it is injectors that the synthetic will do me until summer when I can get in and do the work myself.
Thanks to everyone who has helped.