Crank no start

SGTBLUES0811

MEMBER
2004 FORD F-150
4.6L
V8
2WD
AUTOMATIC
175,000 MILES

I had a problem with the starter, so I changed it. Cranks over. Then it shut off on me on the road. I hauled it back home and found that it was getting spark but no fuel. Fuel pump was bad so I changed it. Also put in a new fuel pump driver module and fuel filter. Dropped the tank and cleaned it. New battery, new alternator. No schrader valve so I pulled the fuel line to the fuel rail and I am getting fuel to the rail. Hooked up OBD scanner and it will not link. Tested power and ground to the port and they are good. Will crank but not start. Sprayed starter fluid into throttle body and it started for a second and shut off. Thinking maybe the PCM? I am going to test the injectors for power tomorrow. I know I am getting fuel to the rail and I know I am getting spark. Any ideas?

5 Replies

JACOBANDNICKOLAS

MECHANIC
109,787 POSTS

Hi and thanks for using 2CarPros. Com.

I was wondering if the injectors are getting power. Also, have you checked the camshaft position sensors? They are what tells the PCM to fire the injectors. I attached a picture of their locations on the engine.

Let me know your results.

Take care,
Joe

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Monday, May 31st, 2021 AT 12:39 PM

SGTBLUES0811

MEMBER
4 POSTS

I just checked the fuel injectors today. Ohm reading across all are even and within spec. They are also reading 12.7 volts which is my battery charge. I cannot get it started, so I am not sure how to tell if the injectors are working. I thought about the crankshaft position sensor, and that may be the problem. I pulled a few plugs today to check for spark and it all checked out okay. Is it more likely to be the crankshaft position sensor or the PCM. Mobile mechanic guy never showed up to test it but said to get a new PCM. Seems drastic to me. Thank you!

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Monday, May 31st, 2021 AT 12:39 PM

SGTBLUES0811

MEMBER
4 POSTS

I just reread your post. You are saying camshaft position sensor. Not crankshaft position sensor. That makes a lot of sense and it is a cheap part. One thing. How do I check for pulse at the injectors? Positive battery to where? And with a test light or a multi-meter? Sorry, I am good with front ends and brakes. The electrical stuff has me confused.

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Monday, May 31st, 2021 AT 12:39 PM

JACOBANDNICKOLAS

MECHANIC
109,787 POSTS

Welcome back.

If you are getting spark, the injectors aren't firing. Here is an easy way to check:

https://www.2carpros.com/articles/how-to-test-a-fuel-injector

Here is a general link for replacing a cam sensor

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

Here are the directions specific to your vehicle for replacement of the sensor. The attached picture shows its location and the sequence of removing it. If you check the injectors and they are working, the cam sensor is not the issue.

_________________________________________

2004 Ford Truck F 150 2WD Pickup V8-4.6L SOHC
Camshaft Position (CMP) Sensor
Vehicle Powertrain Management Sensors and Switches - Powertrain Management Sensors and Switches - Computers and Control Systems Camshaft Position Sensor Service and Repair Procedures Camshaft Position (CMP) Sensor

REMOVAL

1. Disconnect the battery ground cable.
2. Remove the components in the order indicated in the illustration and table.

INSTALLATION
1. To install, reverse the removal procedure.

_______________________________________________________________

Let me know if this helps or if you have other questions.

Take care,
Joe

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