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Low power and running rough

Tiny
DAVID GOOTEE
  • MEMBER
  • 2000 NISSAN FRONTIER
  • 186,000 MILES
Truck starts and idles okay, I can drive a short distance and loses power. Replaced knock sensor, replaced throttle positioning sensor, It does take off slowly then picks up like I said; then can drive for a short distance and starts running rough.
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Sunday, February 23rd, 2020 AT 6:08 AM

10 Replies

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

This could be from low fuel pressure. I would check the actual pressure.

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

It could also be a clogged catalytic converter. If it is blocked, the engine cannot breathe and will result in low power.

https://www.2carpros.com/articles/engine-has-low-power-output

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

Roy
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Sunday, February 23rd, 2020 AT 9:37 AM
Tiny
DAVID GOOTEE
  • MEMBER
  • 8 POSTS
Sorry I forgot to mention the catalytic converter was removed by previous owner.
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Sunday, February 23rd, 2020 AT 10:55 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, back to fuel pressure.

Roy
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Sunday, February 23rd, 2020 AT 11:00 AM
Tiny
DAVID GOOTEE
  • MEMBER
  • 8 POSTS
Thank you. I will check fuel pressure.
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Sunday, February 23rd, 2020 AT 12:18 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You are welcome.

Keep us updated.

Roy
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Sunday, February 23rd, 2020 AT 12:20 PM
Tiny
DAVID GOOTEE
  • MEMBER
  • 8 POSTS
Will do.
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Sunday, February 23rd, 2020 AT 4:17 PM
Tiny
DAVID GOOTEE
  • MEMBER
  • 8 POSTS
Before I replace fuel pump, I noticed I could hear fuel pump come on. Does that mean fuel pump is okay?
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Wednesday, February 26th, 2020 AT 7:39 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
No, it does not. You can have the pump working but if the pressure is too low, it will cause your issue.

Roy
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Wednesday, February 26th, 2020 AT 9:11 AM
Tiny
DAVID GOOTEE
  • MEMBER
  • 8 POSTS
Thanks again.
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Wednesday, February 26th, 2020 AT 10:02 AM
Tiny
ASEMASTER6371
  • MECHANIC
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You are welcome.

Always glad to help.

Roy
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Wednesday, February 26th, 2020 AT 11:12 AM

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