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Truck in limp mode

Tiny
JOHN FEELEY
  • MEMBER
  • 1999 DODGE DAKOTA
  • 5.2L
  • V8
  • 4WD
  • AUTOMATIC
  • 165,000 MILES
The truck is in limp mode for some reason and turns but will not fire. I replaced fuel pump, the pickup coil and the ignition coil. None of these things have worked and relays are all good.
Saturday, February 17th, 2018 AT 7:24 AM

11 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good evening.

Does the engine not start?

You need fuel, spark and compression to run.

Have you checked for spark and fuel pressure?

Roy
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Saturday, February 17th, 2018 AT 5:10 PM
Tiny
JOHN FEELEY
  • MEMBER
  • 6 POSTS
It turns but will not fire. No spark or fuel though it is a new fuel pump.
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Saturday, February 17th, 2018 AT 7:37 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, I sent two diagrams for you to view. Check the fuses in each diagram for power on both sides with the key on.

Roy
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Sunday, February 18th, 2018 AT 4:56 AM
Tiny
JOHN FEELEY
  • MEMBER
  • 6 POSTS
Okay checked all of the fuses and relays and still in limp mode so going to try replacing the crank position sensor today and hope that works. Any other ideas would be appreciated. Thank you for your time.
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Monday, February 19th, 2018 AT 10:03 AM
Tiny
ASEMASTER6371
  • MECHANIC
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It is possible but a way to check is to crank the engine and see if the tach moves up while cranking. That will tell you if a signal is getting to the pcm.

Roy
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Monday, February 19th, 2018 AT 12:13 PM
Tiny
JOHN FEELEY
  • MEMBER
  • 6 POSTS
Okay put in a new crank sensor and still no luck. No spark so any other ideas?
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Tuesday, February 20th, 2018 AT 8:08 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, can you check the voltage on the positive side of the ignition coil?

Roy
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Wednesday, February 21st, 2018 AT 1:50 AM
Tiny
JOHN FEELEY
  • MEMBER
  • 6 POSTS
I will try that today. Thanks
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Wednesday, February 21st, 2018 AT 4:11 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Keep me updated.
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Wednesday, February 21st, 2018 AT 4:12 AM
Tiny
JOHN FEELEY
  • MEMBER
  • 6 POSTS
Took a few days break from this truck but now can say no voltage to ignition coil
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Friday, February 23rd, 2018 AT 8:11 PM
Tiny
ASEMASTER6371
  • MECHANIC
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OK Can you test for voltage at the ASD relay with the key on? This relay provides power to the coil and the fuel pump.

Roy
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Saturday, February 24th, 2018 AT 5:04 AM

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