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Cold Starting issue (sometimes)

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Old 12-08-2018, 10:57 AM
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Default Cold Starting issue (sometimes)

Ok this has been an issue I’v have for awhile.
2014 f150 FX4 5L
Symptoms are:
1 - Starting after a long time like over night the truck has a hard time starting. Starter kicks in and it attempts to fire then cranks for a 3-6 seconds but it struggles to fire up. Feels like fuel delivery issue. If I prime by turning the key to the on position a few times to prime that try it and it works fine.
2 - When driving it hesitates almost like it’s missing but it isn’t. If feels like when I had an old Civic and the AC turned on the car would lose some power. This will happen for only a few seconds and then fine for a few minutes then again. No cadence to this issue but happens sporadically.
3 - When cold or cool the truck will hesitate with power delivery. I push down the peddle and no power then it kicks in and snaps your neck. Doesn’t happen when warm.

Fuel pump fuse bypass was added.
Issue seems to be getting worse.
Fuel model was replaced.

130k on the truck with no tuneup like plugs - maybe over due ?
May have a couple issues here but would like some feedback.
Old 12-08-2018, 11:33 AM
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If you haven't changed plugs and boots with 130k miles, I would definitely start there....That is quite a few miles on plugs and I am willing to bet that is causing some of these misfire issues.
Old 12-08-2018, 11:43 AM
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At 130K, plugs are probably due. My experience with failing COPs (on another vehicle) was that it felt like a stumble in the mid-throttle range, which sounds sort of like what you're describing, so you could be due for those, too.

On previous cars, a long start was an indication of leaking injectors, but I'm not aware of that being a common problem on the Coyotes.

If you always buy gas at the same place, you might try buying it somewhere else just to eliminate the fuel itself as a potential problem. If you're buying at the local no-name stop and rob, try a few tanks from a "Top Tier" brand to see if that makes a difference.
Old 12-08-2018, 01:47 PM
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I can tell a difference in response and I have only 55000 on my plugs. They were due at 100k. Change them first.
Old 12-08-2018, 04:00 PM
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Question

Routinely, how full do you keep the gas tank?

Constantly, frequently having the fuel level low causes ...
  • condensation (meaning: water) in the fuel.
  • overheating of and stress on the fuel pump.
Neither of which result in good starts and fuel pump longevity.
.
Old 12-08-2018, 05:59 PM
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Fuse #27
Old 12-08-2018, 07:20 PM
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Originally Posted by Meathead
Fuse #27
"Fuel pump fuse bypass installed" is presumably the Fuse 27 relocation kit having been installed.



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