Crank no start issue

2011 FORD CROWN VICTORIA
87,000 MILES • 4.6L • V8 • 2WD • AUTOMATIC
Avatar
MICHAEL WESTFAHL
  • MEMBER
  • 5 POSTS
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.
Jun 15, 2022 at 1:01 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
Advertisement
Avatar
MICHAEL WESTFAHL
  • MEMBER
  • 5 POSTS
Also, it is not bring up any codes.
Jun 15, 2022 at 1:22 PM
Avatar
JACOBANDNICKOLAS
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 110,190 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
Jun 15, 2022 at 11:05 PM
Advertisement
Avatar
MICHAEL WESTFAHL
  • MEMBER
  • 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.
Jun 17, 2022 at 7:09 PM
Avatar
JACOBANDNICKOLAS
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 110,190 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
Jun 17, 2022 at 7:30 PM
Avatar
MICHAEL WESTFAHL
  • MEMBER
  • 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?
Jun 19, 2022 at 4:14 PM
Avatar
JACOBANDNICKOLAS
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 110,190 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.
Jun 19, 2022 at 8:05 PM
Avatar
MICHAEL WESTFAHL
  • MEMBER
  • 5 POSTS
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.
Jun 21, 2022 at 4:55 PM
Avatar
JACOBANDNICKOLAS
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 110,190 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
Jun 21, 2022 at 8:33 PM