Crank no start issue

MICHAEL WESTFAHL

MEMBER
2011 FORD CROWN VICTORIA
4.6L
V8
2WD
AUTOMATIC
87,000 MILES

I just bought this car for an enduro race. Cranks healthy, can hear the fuel pump prime for 5 seconds, all fuses are good, have swapped relays for PCM and fuel and ignition, fuel shut off in trunk has been deleted by connecting wires together. Stumped why I can’t get it to fire up.

8 Replies

MICHAEL WESTFAHL

MEMBER
5 POSTS

Also, it is not bring up any codes.

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Wednesday, June 15th, 2022 AT 1:22 PM

JACOBANDNICKOLAS

MECHANIC
108,328 POSTS

Hi,

If there are no codes, chances are it is related to the crankshaft position sensor. Do me a favor. See if it will start for a couple of seconds using starting fluid. If it starts and then stalls, we know its fuel related. If there is no change, suspect there is no spark to the plugs.

Here is a link explaining how to check for spark. Check this if there is no change with the starting fluid.

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

Additionally, read through this link. I feel it will be of interest.

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

Let me know what you find. Also, keep in mind. Even if you hear the fuel pump prime, it may not be producing enough pressure.

Take care,

Joe

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Wednesday, June 15th, 2022 AT 11:05 PM

MICHAEL WESTFAHL

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5 POSTS

So, ended up getting on the obd2 the fuel rail pressure is good. Pulled a coil pack and tried to check for spark, no spark at all. Stumped on what the diag steps are for that. Reminder all fuses have been checked and are good.

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Friday, June 17th, 2022 AT 7:09 PM

JACOBANDNICKOLAS

MECHANIC
108,328 POSTS

Hi Michael,

Oftentimes, when you lose spark and there is no code set, it's due to a faulty crankshaft position sensor.

Do me a favor. Since you were able to get fuel pressure with your scanner, that tells me it provides live data. I need you to check for an RPM signal when cranking the engine. If there isn't one, the crankshaft position sensor is the likely cause.

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

Take care,

Joe

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Friday, June 17th, 2022 AT 7:30 PM

MICHAEL WESTFAHL

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5 POSTS

The live data is picking up RPMs. Would you by chance know the tolerance of ohms for crank and cam sensors so I can check them?

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Sunday, June 19th, 2022 AT 4:14 PM

JACOBANDNICKOLAS

MECHANIC
108,328 POSTS

Hi,

If you have a crank signal, it's working unless the RPM reading is below 150. Regardless, I attached the diagnostics below for testing the entire system. It includes the voltages and resistance information. The diagnostics are to help pinpoint where the issue is coming from.

Take a look through them and let me know if you have questions.

Take care,

Joe

See pics below.

Images (Click to make bigger)

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Sunday, June 19th, 2022 AT 8:05 PM

MICHAEL WESTFAHL

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Ended up being fuse #9 had little continuity but not enough to push correct voltage to coil packs. Thank you for the information though as it had me eliminate the idea of a cam or crank sensor bad.

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Tuesday, June 21st, 2022 AT 4:55 PM

JACOBANDNICKOLAS

MECHANIC
108,328 POSTS

Hi,

I'm glad you found it. Isn't it interesting how a circuit tests good, but when you place a load on it, it fails? Ugh! If I could tell you how many times I have continuity to ground that checked good and failed when a load was placed on it.

Regardless, I'm glad to hear it's fixed. That's what is important. Please feel free to come back anytime in the future. You are always welcome here. Also, you are very welcome for the info. It was a pleasure working with you.

Take good care of yourself,

Joe

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Tuesday, June 21st, 2022 AT 8:33 PM