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Cranks but no start

Tiny
JASGS
  • MEMBER
  • 2004 FORD EXPEDITION
  • 4.6L
  • V8
  • 2WD
  • AUTOMATIC
  • 180,000 MILES
Crank but no start. Rebuilt motor. Replace PCM fuse box (power distribution box built in fuel pump relay)new battery. New keys. I still have no injector pulse or pulse to coil (pebble coil 1 per cylinder). No security light)of and replaced starter as well. At wits end. Help!
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Wednesday, April 15th, 2020 AT 11:33 PM

8 Replies

Tiny
MOTOR MASTER
  • MECHANIC
  • 279 POSTS
Hello my name is Dave.

Have you just replaced the engine? If you have the trouble shooting procedure would be a little different than if you have had the engine running and then it failed to start. A good place to start is to see if you have power to the injectors and coils. If you don't the first thing to check are your fuses, specifically #28 in the right kick panel since it is for the ECU and therefore there would be no power to either the injectors or the coils.

If you could check for power to each of those and get back to us we will be happy to help you further. Please keep us up to date and thank you for using 2CarPros!
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Thursday, April 16th, 2020 AT 4:18 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

Can you hear the fuel pump run when you turn the key to on? It should run for 2 seconds to prime the system. I would check the actual pressure as well.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Can you test for spark as well? When you crank the engine, does the tachometer move up a little while cranking? That will tell me if the crank sensor is working.

https://www.2carpros.com/articles/how-to-test-an-ignition-system

Roy
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Thursday, April 16th, 2020 AT 4:44 AM
Tiny
JASGS
  • MEMBER
  • 4 POSTS
I have replaced crank and cam sensor. Fuel pump is working. I actually got the pressure gauge on it now. I loosened the schrader valve to bleed the air might have tightened it a little too much. And, no tachometer does not move when cranking.
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Thursday, April 16th, 2020 AT 7:37 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
What is the pressure? There is no bleeding of the fuel system. It is self bleeding.

Roy
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Thursday, April 16th, 2020 AT 7:50 AM
Tiny
JASGS
  • MEMBER
  • 4 POSTS
When I was putting the tank in the plastic 90 on top of the fuel pump assembly broke. So I got another assembly from junk yard with out pump. The one I picked up was a return line my truck has the regulator in the tank. So now I have to drop the tank for a third time; yeah me! And plum it correctly. But I have a feeling that the pump is not pumping enough. I've ran into this before with my Explorer. I've tried starting fluid as a trouble shooting tool and still nothing. I can get the motor to turn over. But no signs of life in any shape or form. I've been on this little project for about 6 months now. Doing what I can due when I can afford it. So fuel pump aside can we look into the no spark signal and no signal to injectors? Please and thank you.
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Thursday, April 16th, 2020 AT 8:26 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, when you crank it over, does the tachometer move up a little showing RPM?

That will tell me if the crank sensor is working.

Can you check for spark at the plugs?

https://www.2carpros.com/articles/how-to-test-an-ignition-system

Roy
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Thursday, April 16th, 2020 AT 8:31 AM
Tiny
JASGS
  • MEMBER
  • 4 POSTS
Fuel psi 20 to 30 psi, no spark and no movement on track. Sorry for late response it was a rainy day here in Florida. What's the next step you would like me to take?
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Friday, April 17th, 2020 AT 7:19 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, the pressure is no good. It needs 50 pounds. That is why it will not start.

You will need to replace the fuel pump.

https://www.2carpros.com/articles/how-to-replace-an-electric-fuel-pump

Roy

REMOVAL

WARNING:
Do not smoke, carry lighted tobacco or open flame of any type when working on or near any fuel-related component. Highly flammable mixtures are always present and can be ignited, resulting in possible personal injury.
Fuel in the fuel system remains under high pressure even when the engine is not running. Before servicing or disconnecting any of the fuel lines or fuel system components, the fuel system pressure must be relieved to prevent accidental spraying of fuel, causing personal injury or a fire hazard.

1. Remove the fuel tank.

imageOpen In New TabZoom/Print

2. Disconnect the quick release fittings from the fuel pump.

imageOpen In New TabZoom/Print

3. Using the special tool, remove the fuel pump lock ring.

4. CAUTION: Carefully remove the fuel pump assembly to avoid damaging the fuel level sensor.

Remove the fuel pump assembly.

imageOpen In New TabZoom/Print

5. CAUTION: Note the location of the fuel pump alignment tabs.

Remove the O-ring.

6. Remove the fuel level sensor.

INSTALLATION
1. To install, reverse the removal procedure.
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Friday, April 17th, 2020 AT 7:28 AM

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