ok so haven't posted much here before but here it goes

2002 F150 SCrew 82k miles

for some reason in the afternoons my truck won't start on the first try it sounds like the engine is Trying to start but i guess it wont turn over, im automatically assuming its either my battery or spark plug? other than that i have no idea what it could be or why...it only happens in the afternoons after lunch is over and whatnot

anyone please help is much appreciated

 

does it sound like its cranking up at normal speed? And just not starting?

or does it sound really tired slow cranking sound?

 

eh it sounds slightly slightly slower than a normal startup

and then it just keeps going till i let the key off, i try not to grind it a lot

 

Can you hear the fuel pump come on? Have a buddy turn the key on, and see if you can hear a slight whine from the filler neck.

Might be time for a battery tho, how old is the one in the truck?

 

the batter is good...at least thats what our battery test thing said (hookit up to the battery and it says how good/whatnot) at least i can tell

ok no joke...it won't like stall or do what its doing at night ONLY in the afternoon

and i had my dad turn the key

it does a whine(2 seconds ish) then fart type sound

 

also i want to say that was the 3rd battery in the truck...we had it truly checked last month or so

 

when you crank the truck does the tachometer move at all?

the whine sound is good, not sure what you mean by fart sound. lol

 

yea it moves when the truck is fully started...obviously... :X

other than that no

 

eh any more help would be much appreciated

 

Start by replacing the fuel filter.

 

The sound isn't normal - might be loosing line pressure. First things first - Change filter, then check line pressure's at the rail to determine possible faults.

Wait a minute, I'm confused - the OP states it won't turn over. Then states it does - slow. Needs to clarify the problem. Does the vehicle turn over, but not fire when this happens or does it click ?

Turn over = Crank No Start/Fire.

Click = won't turn over, which is what you posted.

 

ok theres a lil technical :o lol

it turns over but it just grinds

when i redo it a time or 2 then itstarts

 

Grinds? Like it's not catching the flywheel? = Bad starter solenoid - The solenoid that piggybacks the starter, not the one on the firewall.

 

lol, no idea what you said on that'n

ok simple as i can put it

i turn the key, it wants to start but it just doesn't, it makes the sound like its going to start up and then i let off

 

That would be a "click" , that's what happens when they don't start usually. So it doesn't crank ? It doesn't grind then? You need to finish your sentences, it's hard to understand some of the things you post.

Like what does this mean ? "that'n" ? - Is that some sort of code or something ?