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Truck will crank but not start

Tiny
REEDPCA
  • MEMBER
  • 1998 DODGE RAM
  • 5.9L
  • V8
  • 2WD
  • AUTOMATIC
  • 175,000 MILES
Brand new battery, truck will crank when ignition switch is turned on. It won't start, and when I stop the engine will act like it was trying to start but then shuts off.

when turning the key to the on position, I do hear the fuel pump motor kicking on for a few seconds so it isn't that.

Not sure when the last time the sparkplugs were replaced.
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Sunday, February 3rd, 2019 AT 8:53 AM

2 Replies

Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello,

It sounds to me like you could having a problem with your Crankshaft Position Sensor. Here are a couple links that you might find helpful:

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

I have also included this location diagram down below to help you locate it on your vehicle.

Thanks,
Alex
2CarPros
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Monday, February 4th, 2019 AT 12:16 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,380 POSTS
Lets check for spark. Here are two guides to help as well:

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

and

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

Please run down these guides and report back.
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Monday, February 4th, 2019 AT 12:39 PM

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