OBD1 and OBD2 diagnostic trouble code tables for 1995-2016

Tiny
TERRANCE L. FLACK
  • MEMBER
  • 2004 DODGE RAM
  • 4.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 120,000 MILES
I have the truck listed above that has had some issues in the past and the truck sat still for like three months. Now it has a new fuel pump and it will turn over. But never fires up. Yes, there is fuel to the injection and there is fire. So I am trying to figure out what is wrong before I tear it apart.

Monday, September 24th, 2018 AT 5:29 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,645 POSTS
Hi and thanks for using 2CarPros.com.

First, if there is proper fuel pressure and spark to the plugs, it has no choice but to run unless there is low compression or a timing issue.

First, I realize there is a new fuel pump. However, if you have not already done it, confirm fuel pressure is within the manufacturer's specs.

Here is a link that shows how to check pressure in general as well as the pressure regulator:
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

The manufacturer's specifications for pump pressure are :

Fuel System Pressure .................... 400 ± 34 kPa (58 ± 2 psi)

The first two pictures below are flow charts for fuel related issues.

Next, make sure the spark is a hot blue snapping spark. If it is white or orange, it may be too weak to ignite the fuel. Here is a link that shows how to check for spark:

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

If everything checks out correctly, confirm that the fuel injectors are working. Here is a link that shows how to check injectors:

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

An easy way to confirm that the engine is getting spark and fuel is by trying to start it using starting fluid. If it starts for a couple seconds, then there is no fuel getting into the engine. If it does not start even with starting fluid, then there is an ignition related issue.

Do these tests and let me know the results. Also, if you have other questions or need additional help, let me know.

Take care,
Joe

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Tuesday, September 25th, 2018 AT 6:23 PM

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