Idles and then shuts off, suspected the fuel pump?

Tiny
SLEPIK
  • MEMBER
  • 2007 DODGE NITRO
  • 3.7L
  • V6
  • 4WD
  • AUTOMATIC
  • 250,000 MILES
I have the vehicle listed above and when my wife was driving it just suddenly shut off, so I suspected the fuel pump. I replaced the fuel pump, and it still doesn't run. The engine doesn't idle for more than a minute and then shuts off without me pumping the gas pedal. The new spark plugs are already fouled and seem like it's running rich. I also checked the fuel pressure, and it was good.

I have replaced the following:

Intake sensor
MAP sensor
New battery
PCV valve
Throttle body
Fuel pump
Spark plugs
Crankcase ventilation hose
Tuesday, October 15th, 2024 AT 8:02 AM

3 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,626 POSTS
It sounds like you have a vacuum leak, have you done any checks for this? Please go over these guides when the engine is cold only:

https://www.2carpros.com/articles/stall-at-idle

Also, we should run the codes to see if any are present. This guide can help:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Please go over these guides and get back to us.
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Tuesday, October 15th, 2024 AT 11:26 AM
Tiny
SLEPIK
  • MEMBER
  • 2 POSTS
I will check for a vacuum leak. Do you have any hints or tricks that would help with that? Also could it be the O2 sensors causing it to idle and shut off quickly?
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Wednesday, October 16th, 2024 AT 8:09 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,626 POSTS
Please go over the guide above it shows how to check for a vacuum leak. I don't think the oxygen sensors will cause the problem you are having.
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Wednesday, October 16th, 2024 AT 10:40 AM

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