Wont start

[backroad101]

So drove the truck briefly yesterday. Went to drive it this morning and it would not start. Turns over but wont start. As a first step I pulled the starter and took it to both ORiellys and Autozone to have it tested. Tested good

Tomorrow I am going to change out the fuel filter and check all my fuses and relays. Want to check everything I can before having to drop the tank. What else should I be checking? The are no codes that come up on my hand held code reader.

When it comes to changing the pump (if it comes to that), what is honestly easier, dropping the tank or pulling the bed off? Keep in mind the truck has a hard tonneau on it, is backed into the garage, does not start and my garage is in an alley (ie no driveway). It is a 2 car garage so I could always side step it.

Thanks

 

[FireFighter431]

Are you getting fuel and/or spark? I would check for both before tearing the truck apart.


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[backroad101]

Are you getting fuel and/or spark? I would check for both before tearing the truck apart.
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How would I go about this?

I guess for spark I could pull the plug wires one by one, put a spare plug on it and see if each one sparks? Issues may be a bad coil(s)? But even with a couple plugs not firing, wouldn't it still start and run rough?

How do I check to see if I am getting fuel? That's something I've never had to deal with.

Thanks

 

[backroad101]

Ok, so I looked at a replacement ignition coil online and it is one unit with 6 posts. I thought is was 3 coil packs with 2 posts each like GM used to do. So I get if it goes bad, none of the plugs will fire? Would that be a correct statement?

And how to I test to see if I am getting fuel?

 

[RonD]

I assume the engine is turning but not starting.

First thing I would do is to get some Starting Fluid(ether in a spray can).
Remove the power brake vacuum line from the intake and spray some into the intake, or remove the PCV valve line and do the same, replace the vacuum line, then crank the engine, if it fires and dies then fuel is the issue, if it doesn't fire then spark is the issue.

For spark there are only a few things, check for 12v at the coil with key on, there are 4 wires on the connector, one will be 12v, engine does not need to be cranking, 12v is there with key on.
Check fuses in engine compartment fuse box.
CKP(crank position) sensor could be bad or its wire, the CKP tells the computer that the engine is turning so start the spark, if this has a bad connection or is broken computer will never start the spark/coil.
These rarely fail on Fords, and do the spray test for spark first.

There are 3 coils but they are connected together, each pair of spark plug wires are one coil, both wires fire at the same time, one coil failing or even two would cause a no start, it would still fire just wouldn't "run", lol.

Ford has a fuel priming system.
When you turn on the key you can hear the fuel pump run for 1 or 2 seconds, you don't have to crank the engine, just turn key on and off, each time it is on you will hear the pump come on for a short time.

If you hear it then fuel pump is probably not the problem.
If you don't hear it then it still may not be a pump problem, the fuel pump has a relay that must have power and an inertia switch that cuts power to pump if there is a crash, but it can fail and just cut power.
Check Fuel pump fuse.
The inertia switch is in the passenger foot area, either behind the kick panel or just under the glove box, it has a reset button on it, two wires, either should have 12v when key is first turned on, for 1 or 2 seconds.
If there is voltage on both then you will be moving back to the fuel tank

 

[backroad101]

So I swapped the fuel pump relay with the horn relay and the truck started right up. Swapped them back and started as well. Just a case of it needing to be reseated? I'm prob just going to replace the relay to be safe. Not thrilled I spent time wrestling the starter out and in to have tested but pretty happy it ended up being a simple fix before I got any more in depth.

 

[RonD]

Good work

Ford Fuel Pump relays seem to pop up as problems quite often