Shut off, cranks will not start

Tiny
JAMES CHAMBERS
  • MEMBER
  • 1999 DODGE DAKOTA
  • 3.9L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 250,000 MILES
Replaced plugs and wires, coil. What else could be the reason for cranking but no start. Fuel pump comes on with fuel I fuel rail.
Thursday, June 24th, 2021 AT 1:58 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,779 POSTS
Hi,

Chances are you lost spark. See if it starts for a couple of seconds using starting fluid. If it does, then it's likely not getting fuel (low pressure or injector issue). If it doesn't try to start, check for spark. Here is a link that explains how it's done:

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

If you find there is no spark, using a live data scan tool, see if there is an RPM signal when cranking, or if it has a tachometer, see if it moves slightly when cranking. If you find it doesn't, it's likely the crankshaft position sensor (CKP).

Here are two links you may find of interest. The first describes common symptoms of a failing CKP. The second explains in general how one is replaced.

https://www.2carpros.com/articles/symptoms-of-a-bad-crankshaft-sensor

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

If you look at the attachments below, they provide the directions specific to this vehicle for replacing the CKP.

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

Take care,

Joe

See pics below.

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Thursday, June 24th, 2021 AT 9:41 PM

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