Does not start

DODGE RAM
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BELDON420
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  • 2 POSTS
I have a 2002 Dodge Ram 3.7. one of the heads got messed up so I changed it. I have compression, I have fire, and I have fuel. It still will not start. There are a few things I would like to test however I need instructions on these things.
1. What should the fuel pressure be?
2. How can I use a vacuum gauge to check for proper valve timing? where do I connect the gauge?
3. Someone said it may be the computer. How would I know?

The truck will almost start but not quite.
Jun 10, 2007 at 7:25 AM
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KIN CHAN
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know anything about OBDII system???
Jun 10, 2007 at 10:20 AM
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BELDON420
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Yes, Dodge's have an on-board diagnostic system. I get no codes.
Jun 10, 2007 at 10:28 AM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
Good evening,

Which side did you check for compression? What was the compression? You need at least 13-150 for compression and all 6 cylinders should be almost the same.

https://www.2carpros.com/articles/how-to-test-engine-compression

The fuel pressure need to be 50 lbs.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

As far as the vacuum gauge, yes. I still use it. Remove the hose from the brake booster and put the gauge there. You should have 18-22 inches of vacuum at idle.

I would also check the injectors. They need a signal from the ECM to allow fuel into the cylinders. You would need a noid light to test and see if the ECM is commanding the injectors to fire.

Roy
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Mar 24, 2020 at 9:39 AM
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