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Misfire code PO300 and surge

Tiny
FARR2007
  • MEMBER
  • 2004 DODGE DAKOTA
  • 4.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 170,000 MILES
Po300 and surges while driving.
Wednesday, December 26th, 2018 AT 2:47 PM

6 Replies

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

I would start by checking the fuel pressure as this is the most common reason for a code 300. low fuel pressure will not provide enough fuel to the injectors for proper fuel mapping.

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

How old are the tune up parts?

https://www.2carpros.com/articles/engine-surges

Roy
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Wednesday, December 26th, 2018 AT 2:53 PM
Tiny
FARR2007
  • MEMBER
  • 210 POSTS
Where is the pressure regulator location?
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Wednesday, December 26th, 2018 AT 6:21 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
The regulator is part of the fuel pump module in the fuel tank. It is not external.

Roy
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Wednesday, December 26th, 2018 AT 6:28 PM
Tiny
FARR2007
  • MEMBER
  • 210 POSTS
Where on that diagram?
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Wednesday, December 26th, 2018 AT 8:41 PM
Tiny
FARR2007
  • MEMBER
  • 210 POSTS
Would a vacuum leak do that too? Also, how to you swap the fuel pressure?
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Wednesday, December 26th, 2018 AT 10:20 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
It is part of the pump.

You replace the fuel pump assembly.

No, a vacuum leak will not effect fuel pressure.

Roy
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Thursday, December 27th, 2018 AT 3:38 AM

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