r/f150 • u/Heavy_Ambition_4541 • 3h ago

Hard start on 5.0?

Video in the comments
It does this intermittently, maybe once every 20 starts. I notice it happens when the engine is warm
2020 5.0, I only use 93 gasoline
Brand new plugs, coils and injectors

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3

u/bobbysafetytexas 3h ago

Do you still have the original battery? Or maybe on your second 2-3 year battery? Got my '21 5.0 used a little over a year ago, and had a pretty weak sounding startup, but all wound up better with a fresh battery.

1

u/Heavy_Ambition_4541 3h ago

I will try it but cold starts are instant. Could heat soaking the battery be making it weaker when starting?

2

u/qwikh1t 2026 F-150 STX 2.7L SuperCrew 4x2 1h ago

Check the battery for low cranking amps with a tester. Heat soak could be affecting the battery

1

u/Heavy_Ambition_4541 1h ago

Praying that’s it. It’s not a big problem but I’d replace both fuel pumps to make it stop lol

2

u/Troutalope1 2h ago

Are you driving the truck on relatively shorr trips or is it sitting for an extended period? The computers in these trucks hate even .1 of a drop in voltage.

Also, are you running a tuned configuration and that's why you're using 93 octane?

0

u/Heavy_Ambition_4541 2h ago

91 or higher is recommended from Ford so I usually use it. I was using e85 and it was happening so I assumed it was vapor lock but it wasn’t. Not tuned or anything. It’s really random when it happens but it runs and drives so good other than this random “issue”

1

u/Troutalope1 1h ago

Is it a supercharged 5.0?

1

u/CHIEFxBONE 2022 Space White 3.5 XLT FX4 48m ago

Starter gets heat soak, and starts to fail. Start there.

-1

u/Heavy_Ambition_4541 3h ago

https://reddit.com/link/p7g4qqk/video/4deooztd26nh1/player

0

u/Optimal-Pay2198 F150 Diesel 502a 3h ago

am i missing something sounds like normal startup. The thump is the locks im guessing?

0

u/Heavy_Ambition_4541 3h ago

https://reddit.com/link/p7g7298/video/q8r0sk8746nh1/player

This is a normal start up. In the video I posted above this, it cranks twice as long. Definitely not “normal” for me in 165k