Pickup cranks normally but won't start. '07 F150

[Special T]

It's an 07 but you haven told us how many miles are on it.

I would follow Jackolopes advice and squirt a little fuel or ether.

Btw it is much easier to change that tank with only 5 gal or empty and perhaps needs a good cleaning.

[Kittman]

I had an issue on an old Dodge truck of mine where sometimes it wouldn't start right away and would take up to like 18 start attempts before it would get spark & finally run.  Once running it would be fine.  Long story short was an intermittent electrical problem with the ignition switch in the steering column. 

I replaced the key switch and my crank and no-start problem went away.

[JimmyHoffa]

It's an 07 but you haven told us how many miles are on it.

I would follow Jackolopes advice and squirt a little fuel or ether.

Btw it is much easier to change that tank with only 5 gal or empty and perhaps needs a good cleaning.

When I've done fuel pumps on pick ups, pulling the bed off was the easier method in some respects.

[Kittman]

My brother had a 2003 ford F150 and had a fuel pump relay fail.

[Special T]

It's an 07 but you haven told us how many miles are on it.

I would follow Jackolopes advice and squirt a little fuel or ether.

Btw it is much easier to change that tank with only 5 gal or empty and perhaps needs a good cleaning.

When I've done fuel pumps on pick ups, pulling the bed off was the easier method in some respects.

The old Subaru wagons had a fuel pump access hatch.

[andersonjk4]

Pickup has 103,000 miles on it.
I just picked up a tuner/scanner from my BIL that measures fuel rail pressure. Just resting FRP is 38-40 while key is ON. While cranking, FRP jumps to 75 and dips a little bit then settles down steady at 75. This leads me to believe now that it's not a fuel issue.
So on to spark. Removed air filter and had a buddy spray starting fluid in the air intake while cranking and nothing. Not even a hint of firing. So now I'm thinking its a no spark issue. What would cause no spark and still not throw any codes? I've been checking any and all fuses and relays related to the PCM and ingnition. But haven't found anything.

[Redbeard]

I'm interested in the outcome in case my 08 pulls this too.

[j_h_nimrod]

I had a car years ago that did something almost identical.  Me and my stepdad who was a competent mechanic could not figure it out so took it to the garage. The mechanic there went round and round trying to figure it out, sensors, relays, ecms.  He finally pulled the cover off the timing chain and found shattered parts. Never made a noise and outward indicators were all good. I think your 07 probably has a timing sensor, but who knows?

[andersonjk4]

I just found a blown fuse for the shift solenoid, CMS #12 and #22, ignition coils. I replaced the fuse tried to start it and the replacement fuse instantly blew. So this should have narrowed down the problem, now to figure out where the short is.

[j_h_nimrod]

I would first check to see if you are getting a ground fault in the lead wire, if not then could be the solenoid grounding out or fried. 

Maybe your fuse is too small, just replace it with the next size up** until it quits blowing







**The above is a joke and should never be attempted .  Replacing a fuse with a higher amperage fuse is never recommended and can lead to serious injury, death, fire, or mechanical damage.  The author accepts no liability if your dumb @$$ attempts this and causes serious injury, death, fire, mechanical damage, or any other bad outcomes.

[RadSav]

I just found a blown fuse for the shift solenoid, CMS #12 and #22, ignition coils. I replaced the fuse tried to start it and the replacement fuse instantly blew. So this should have narrowed down the problem, now to figure out where the short is.

Had that issue on my last Dodge.  I'd move a few things and it would fix itself.  Then get on the road for a long trip and it would go again.  Finally broke down and took it to a shop to see if they could track it.  Ended up being one of the exhaust sensors had gone bad.

[syoungs]

Crank position sensor will fail without a code I think.

[fish vacuum]

What would cause no spark and still not throw any codes?

Electrical tape over the check engine light.

[hunter399]

Those type fuse can be starter,coil, all kinds of stuff .take the battery out then put fuse in , when does it blow , when you hook up positive cable,when you turn key,,or what,very important when it blows to narrow it down,im thinking coil,cause I don't think your iginion would be bad,make sure no spark plug wires melted or any wires melted.

[jackelope]

 Unplug all your coils and try and start it. Obviously it won't start, but see if the fuse blows. If it doesn't, maybe you have a bad coil. Maybe you could plug them in one at a time and try it to see  if the fuse blows. If it does on a specific coil, that would lead me to believe you have high resistance on a coil.