Cranks will not start

Tiny
DESIREE23
  • MEMBER
  • 2006 FORD EXPEDITION
  • 4WD
  • AUTOMATIC
  • 150,000 MILES
My car wont start at first it did every time. I put foot on gas it shuts off. What could this be? But now it wont start at all it just cranks. :(
Tuesday, January 15th, 2019 AT 8:15 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,575 POSTS
Hi and thanks for using 2CarPros.

It could be a couple things. First, I would suggest reading through this link:

https://www.2carpros.com/articles/car-cranks-but-wont-start

Now, based on your description, it sounds like a fuel pressure issue or a bad crank sensor. Here is a link that describes a bad crank sensor and one that shows in general how one is replaced:

https://www.2carpros.com/articles/symptoms-of-a-bad-crankshaft-sensor

https://www.2carpros.com/articles/crankshaft-angle-sensor-replacement

If you determine there is no spark to the plugs, this is my first suspect. Here is a link showing how to check spark:

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

Here are a few links that you may find helpful when working with the ignition:

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

https://www.2carpros.com/articles/how-to-use-a-voltmeter

https://www.2carpros.com/articles/how-to-check-wiring

________________________________________________________________________________
Here are the directions specific to your vehicle for sensor replacement

CRANKSHAFT POSITION (CKP) SENSOR

see pic 1

Removal and Installation
1. With the vehicle in NEUTRAL, position it on a hoist.
2. Disconnect the battery ground cable.
3. Remove the accessory drive belt.
4. Disconnect the A/C compressor electrical connector.
5. Remove the 3 bolts and position the A/C compressor aside.
- To install, tighten to 25 Nm (18 lb-ft).

6. Disconnect the crankshaft position (CKP) sensor electrical connector.
7. Remove the bolt and the CKP sensor. Discard the O-ring seal.
- To install, tighten to 10 Nm (89 lb-in).
- Lubricate the new O-ring seal with clean engine oil prior to installation.

8. To install, reverse the removal procedure.

________________________________________________________________________

Now, if you find the spark is good, then check fuel pump pressure. Here is a link that shows how that is done.

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

Here are the manufacturer's specs for fuel pressure.

Fuel Pressure
Key on, engine off .................... 240-310 kPa (35-45 psi)
Engine running .................... 193-310 kPa (28-45 psi)

________________________________________________________________________

Let me know what you find or if you have other questions.

Take care,
Joe
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Tuesday, January 15th, 2019 AT 8:28 PM

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