Long crank, no faults

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Jimmy Brooks

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As weather began to get colder I started to notice that my car would occasionally take longer to crank over. Can’t find any correlation or connection between weather and how long it cranks, seems to be more of a random occurrence and usually on the first start of the day but didn’t have issues went the temperature was below 30 F while I was on a ski trip. Wasn’t too worried about it until today when I went to start the truck in the morning and had it crank for around 10 seconds until finally turning over. Immediately checked DTCs and didn’t find any out of the ordinary. When the car warmed up I gave her some beans and she felt great no hesitation and definitely full power. Car starts fine now after that, not sure what it is but obviously fuel system related maybe low pressure fuel pump??? Feel free to drop some wisdom.

Thanks!
 

16FujiDisco

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my first thought is battery related. Not necessarily that it’s bad, just sluggish because of the cold. I’ve experienced that in other vehicles. Once it gets some heat in it, it’s all good.
 

Jimmy Brooks

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my first thought is battery related. Not necessarily that it’s bad, just sluggish because of the cold. I’ve experienced that in other vehicles. Once it gets some heat in it, it’s all good.
Could be. I did notice that in below 32 F weather that the voltage would not go up from 12.2 V aftwr starting the car until I pulled away and RPMs were raised from idle. Today it wasn’t particularly cold, it just rained all last night and when I started the car for the first time it was probably in the high 40s or low 50s. Maybe it is battery related but it just seems like the car cranks and cranks but gets no fuel into the engine.
 

Jimmy Brooks

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Is it cranking slow during the 10 seconds or at normal speed?
It’s not slow, I’ve heard it crank faster but it’s not slow to where I think it’s a battery issue. It’s more of a medium speed but a normal health speed given the lower temperatures.
 

jlglr4

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I’d be thinking fuel. Not sure why cold weather would affect it, but maybe leaking injectors, minor leak in a fuel line connection, or faulty pressure regulator letting the fuel drain out when the car sits. I think the pressure regulators are built into the hp fuel pumps.
 

djkaosone

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I just came out of 22*F weather out of Big Bear, CA yesterday and with as much snow as your profile pic @Jimmy Brooks. Just spit balling here.

Your truck probably isn't acclimated to the cold weather. Vacuum and fuel pressure is probably a lot lower than "normal". It probably took a bit longer to build vacuum and create pressure in the fuel lines, and for the barometer to adjust for it. That's my guess.

I left my truck sitting at the cabin for 3 days without starting it, it took 3 long cranks to fire up, but once it did it fired right up afterwards.
 

Jimmy Brooks

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I’d be thinking fuel. Not sure why cold weather would affect it, but maybe leaking injectors, minor leak in a fuel line connection, or faulty pressure regulator letting the fuel drain out when the car sits. I think the pressure regulators are built into the hp fuel pumps.

is there anyway I can check and confirm with live values on IID tool? No smell of gas ever though.
 

Jimmy Brooks

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I just came out of 22*F weather out of Big Bear, CA yesterday and with as much snow as your profile pic @Jimmy Brooks. Just spit balling here.

Your truck probably isn't acclimated to the cold weather. Vacuum and fuel pressure is probably a lot lower than "normal". It probably took a bit longer to build vacuum and create pressure in the fuel lines, and for the barometer to adjust for it. That's my guess.

I left my truck sitting at the cabin for 3 days without starting it, it took 3 long cranks to fire up, but once it did it fired right up afterwards.
It’s just odd. I was up in mammoth for a couple of days while it was 20 F and the car started fine the whole trip. Yet when I was up in Santa Clarita aftwr it rained it cranked for the longest time and finally turned over. Just did it again this afternoon after it had sat for about 5 hours. I just can’t seem to tie it to the weather other then the fact that it “coincidentally” (most likely a coincidence) started happening as winter rolled around. Seems to be more common when letting it sit for a while.
 

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