My engine wont start up?

Tiny
MIKESKUD
  • MEMBER
  • 2003 DODGE DAKOTA
  • V8
  • 2WD
  • AUTOMATIC
  • 65,000 MILES
When the engine is cold it start right up, as soon as it gets warmed up it won't start. When it wont start I cant hear the fuel pump? Thank you for your help.
Wednesday, December 30th, 2009 AT 8:10 AM

2 Replies

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

Does the engine crank over when warm and not start?

You could have a faulty relay, that does not work when it warms up. You need to check the fuel pressure when the engine is warm that way you can rule out the relay.

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

It could also be a faulty crank sensor. When warm up it does not provide the correct signal to start the engine.

https://www.2carpros.com/articles/how-a-crank-shaft-angle-sensor-works
https://www.2carpros.com/articles/symptoms-of-a-bad-crankshaft-sensor

I have attached the locations diagram for your reference.

Please let me know of any questions.

Thank you.
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Sunday, August 1st, 2021 AT 9:31 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,139 POSTS
Hi,

A crank no start condition can be caused by a few things. You indicated that you hear the pump, but that doesn't indicate it's producing enough pressure to run the engine. So, the pump may be bad.

Additionally, a common cause of a crank no start when the engine is hot is a faulty crankshaft position sensor. When they begin to fail, heat adversely affects them causing a loss of ignition spark to the plugs. So we will need to consider that as well.

To get you started, take a look through this link. It describes the most common causes of a crank no start condition.

https://www.2carpros.com/articles/car-cranks-but-wont-start

Now, the easiest thing to try is this. See if the engine starts for a couple of seconds and then stalls using starting fluid. If it does, then we know it is fuel-related. If it doesn't, then it is likely ignition-related

If you want, here are two links. One is specific for testing spark and the other is for fuel.

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

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

If you find there is no spark, expect the crankshaft position sensor failed. If there is no fuel or low pressure, suspect the fuel pump is failing.

Once you determine which is the problem, I attached pics below specific to your vehicle. The directions include the procedure for fuel pump replacement and for the crankshaft position sensor. The fuel pump will first remove the removal of the fuel tank, so I am going to start with the directions for that.

I hope this helps. Let me know if you have other questions.

Take care,

Joe

See pics below.
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Sunday, August 1st, 2021 AT 9:36 PM

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