Crank no start?

BWOZNIAK132

MEMBER
2007 FORD EXPEDITION
5.4L
V8
4WD
AUTOMATIC
268,000 MILES

For about a month now, the car starts and runs great, shut it off, then have to wait about an hour before it will start again. Cranks but won't start. This morning it started just fine then shut off after about 5 minutes. Now it won't start at all. Still cranks.

5 Replies

JACOBANDNICKOLAS

MECHANIC
109,755 POSTS

Hi,

What you described sounds like a failing crankshaft position sensor. When they begin failing, they can be adversely affected by heat. Once they cool, they can work again.

Do me a favor. Take a look through this link and let me know if it mirrors what you are experiencing:

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

I attached a pic below of the sensor's location.

Let me know.

Joe

See pic below.

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Wednesday, December 6th, 2023 AT 8:23 PM

BWOZNIAK132

MEMBER
3 POSTS

I had the same thought. My stepson is a mobile mechanic. He came over and scanned the car for me. I have no codes. Said he tested both crank sensors and the cam sensor, all were good. But the car started at the time. Should we go through it again now that it won't start at all?

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Thursday, December 7th, 2023 AT 6:47 AM

JACOBANDNICKOLAS

MECHANIC
109,755 POSTS

Hi,

Yes, I would suggest it. Also, keep in mind the crankshaft position sensor may fail and not set a code. It isn't uncommon.

If you want, see if there is spark at the plugs. If the sensor is the issue, you won't have spark.

Here is a link that explains how it's done:

https://www.2carpros.com/articles/how-to-check-for-ignition-spark

Let me know.

Joe

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Thursday, December 7th, 2023 AT 8:21 PM

BWOZNIAK132

MEMBER
3 POSTS

You were right. I pulled the crankshaft sensor and it had about an inch long crack down the side of it. Put a new one in and she's running like new. Thank you very much for your time and help.

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Friday, December 8th, 2023 AT 11:45 AM

JACOBANDNICKOLAS

MECHANIC
109,755 POSTS

Hi,

You are very welcome. I'm glad to know it's fixed and thank you for the update. LOL

Take care of yourself and have a great holiday season. Also, feel free to come back anytime in the future.

Joe