Automotive Repair

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In the shop, under the hood, and between the valves. A place for showcasing busted knuckles, discussing the regrettable career choice, and finding out where the tick noise is coming from.

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2007 f150 Not Starting (self.auto_repair)

submitted 3 months ago by Cheems to c/auto_repair

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Truck gets power and attempts to turn over.

Which made me think it wasn't the starter or battery.

Looking things up online it pointed me to the fuel pump.

I went through and did the whole diagnostics with checking that. Including checking the fuses and relay.

I found a video saying the fuel pump control module could be messed up, and it looked pretty rusted out so I changed that. But it didn't fix the issue.

So I going back to the fuel pump diagnostics of the fuel pump, it said to turn the accessory on with the key and you should hear the fuel pump kick on if you put your ear to the gas cap. I did but I honestly don't know what I'm supposed to be hearing.

I'll probably go ahead and replace it, but is there anything else that I should be checking or what?

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[–] Cheems 2 points 2 months ago (1 children)

have you already checked the spark plugs?

No! But I did check some of the fuel injectors with my volt meter and all the ones I checked seemed fine so I kinda nixed the injector theory and moved into spark plugs, just got back from the store with a new set.

There's no corrosion or visible damage on the battery terminals right?

Battery is brand spanking new as of two months ago. And also running as expected with the volt meter.

difficulty starting could be the fuel injectors, but they don't usually all fail from one day to the next, that's usually more of a build up over time.

I definitely agree on that one, I just was lost after the fuel pump fiasco

If I understand your circumstances, one day the truck just stopped starting normally.

is that correct?

Very much so

does it sound normal trying to turn over or is it stumbling over itself?

It sounds perfect aside from the not actually starting thing.

[–] [email protected] 1 points 2 months ago (2 children)

got it.

ignition coils spring to mind in that case also, and you have to remove them to get to the spark plugs anyway on the f150

a bad ignition coil could cause the non-sparking issue.

spark plugs, ignition coils, starter solenoid, then starter motor is the order I'd go.

If you're going to replace all the plugs anyway and you have the cash, replacing each ignition coil as you go rather than popping the old ones back in isn't going to hurt, especially if the truck's near 100k miles.

spark plugs are more likely to fail and fail sooner, so if you want to try switching them out first, also no harm there.

it'll end up being whichever is at the bottom of your checklist, of course, but the sudden failure has me leaning toward a single electrical point of failure rather than fuel delivery.

[–] Cheems 2 points 2 months ago

I think at this time I'll swap out the sparks. Just as I've already done so much. Coils will be on my list though.

[–] Cheems 2 points 2 months ago (1 children)

I had tried everything I could think of and ended up taking it to a shop.

They ended up fixing it in a day.

The issue? The grounding wire was corroded.

[–] [email protected] 2 points 2 months ago

whoa!

congratulations, I'm glad it's working again.

thanks for letting me know, now I'm watching F-150 videos about corroded grounding wires.

not an uncommon problem, apparently.