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Old 01-12-2018, 10:09 AM   #11
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Originally Posted by pbeggs View Post
cranks (very fast,..fresh battery yesterday,.) have it on charger to replace cranking loss
when it starts,... it starts instantly
bright lights
not a real humid area (just got done with -10 for a week)
not frozen (+40 today)
you can go out start it then a few hours later it wont start,.. then maybe the next day it will start. or not
Guessing it's a sticky bendix or some kinda solenoid or relay

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Old 01-12-2018, 10:16 AM   #12
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Lots of possibilities but you can do some basic tests... Such as, check for spark, and if you have spark, that rules out entire classes of issue. If not you have a fairly small number of things to check next.

Similarly, if you spray in some starting fluid, that briefly removes the "fuel" requirement for combustion. If you get sputters with starting fluid and nothing without it, you've narrowed the issue down to fuel delivery.
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Old 01-12-2018, 11:29 AM   #13
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thanks all
the garage that "fixed it" came and towed it again (im not paying for another tow when all i did was drive it home then had same problem)
i think there gonna look at it not just assume that it was the dead battery ( i cranked it till the batt was dying then it sat for 2 weeks in sub zero temps)
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Old 01-12-2018, 02:19 PM   #14
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Lots of possibilities but you can do some basic tests... Such as, check for spark, and if you have spark, that rules out entire classes of issue. If not you have a fairly small number of things to check next.

Similarly, if you spray in some starting fluid, that briefly removes the "fuel" requirement for combustion. If you get sputters with starting fluid and nothing without it, you've narrowed the issue down to fuel delivery.
Just be darn careful if removing/installing a spark plug on this 5.4 engine. Look into these motors if you aren't familiar!
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Old 01-14-2018, 11:52 AM   #15
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One thing that gets over looked in the Fords is the ECU relay. I've been chasing a random no start issue. I replaced the fuel sending unit, fuel filter with the the sender, fuel pump relay, replaced multiple fuses, a few other sensors and electrical parts. My neighbor had the same issue with his and they replaced the power distribution panel under the hood, but didn't replace all the fuses and relays. It ended up being the ECU relay. He spent almost $2000 chasing that no start issue on a $1500 truck.
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Old 01-14-2018, 01:36 PM   #16
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I had a 2010 truck withe the same motor and almost identical electrical that loved a fuel pump fuse. After many trips/towers to the dealer it took a local tow to a junk yard friend of mine to his shop and his junkyard mechanics to figure it out.
After that I carried extra fuses for when it happened instead of a full computer replacement that the dealer wanted and didn't want to pay for.
Cheap fix for that truck and maybe not the real fix but 4-fuses in 2-years means there is a problem that even the dealer didn't want to touch.
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Old 01-14-2018, 02:36 PM   #17
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I had a 2010 truck withe the same motor and almost identical electrical that loved a fuel pump fuse. After many trips/towers to the dealer it took a local tow to a junk yard friend of mine to his shop and his junkyard mechanics to figure it out.
After that I carried extra fuses for when it happened instead of a full computer replacement that the dealer wanted and didn't want to pay for.
Cheap fix for that truck and maybe not the real fix but 4-fuses in 2-years means there is a problem that even the dealer didn't want to touch.
I have ran into fuel pumps that were going bad and they would pull to much power from drag due to bad bushings/bearings and pop fuses randomly. It always seems to be Ford. I've never had luck with a Ford made after 1979.
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Old 01-16-2018, 01:24 PM   #18
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it was the
crank position sensor,.....
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Old 01-16-2018, 01:59 PM   #19
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Quote:
Originally Posted by pbeggs View Post
it was the
crank position sensor,.....
I win! lol

Glad you got if figured out!
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Old 01-16-2018, 02:21 PM   #20
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yes you do! and your prize is

the bill from the garage,
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