How cold ? My truck is 99. 9% never started dead cold unless the cord got disconnected or the 24hr timer it is on did. Start time is 3AM off time is 11AM M-F 1PM wknds. in case I don't go anywhere early. Engine is covered with a folded in half moving blanket to keep heat in.
History
-2003 truck, HO, auto, stock except for air intake and filter
-About 197k miles
-I have had it about 110k of those miles. No major repairs (except wear parts in the drive line and suspension)
-Lately, it does not want to start when cold. I have had to plug it in for any weather close to or below freezing.
-Over the past few years, it only needed to be plugged in during sub zero temps.
-The really odd thing is, I have left it at the airport (with temps in the teens and twenties) and it has started with out a problem. I run the heater grids a few cycles, and it starts.
-One thing to add, it seems to need longer cranking all of the time (even warm) then it used to. Not much, but a second or two.
-Once it is running, it runs fine. No driving problems, seems to still get good mileage, and idles fine.
Trouble Shooting
-I have verified plenty of oil, good voltage, and grid heater is working.
Questions
-Why all of the sudden has my truck developed a dislike of barely cold weather. It used to start fine down to zero, and only needed to be plugged in when it was sub zero. Why, with 20 degree nights and 30 degree days, has it become a problem?
-Why, when it dropped to zero during the time it was at the airport, did it start then and not now?
-Why is the crank time to start longer
Relevant info
-Stock lift pump. I have not replaced it in the 110k miles I have owned the truck. Not sure if it had been replaced by the previous owner.
-Stock injectors. I have not replaced them in the 110k miles I have owned the truck. Not sure if they had been replaced by the previous owner.
-Fleetgaurd fuel filter, changed every 15k miles. It is due, and I will be doing that this weekend with an oil change.
-I have a new lift pump, and I will be putting it in this weekend as a precaution.
Injectors?
-I don't want to replace injectors if mine are still good. It drives fine and gets good mileage, so I do not (at this tim) suspect my injectors.
-What is the best way (with out removing them) to test the injectors?