Low power and running rough

2000 NISSAN FRONTIER
186,000 MILES
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DAVID GOOTEE
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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.
Feb 23, 2020 at 6:08 AM
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ASEMASTER6371
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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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Feb 23, 2020 at 9:37 AM
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DAVID GOOTEE
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Sorry i forgot to mention the catalytic converter was removed by previous owner.
Feb 23, 2020 at 10:55 AM
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ASEMASTER6371
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Okay, back to fuel pressure.

Roy
Feb 23, 2020 at 11:00 AM
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DAVID GOOTEE
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Thank you. i will check fuel pressure.

Feb 23, 2020 at 12:18 PM
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ASEMASTER6371
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You are welcome.

Keep us updated.

Roy
Feb 23, 2020 at 12:20 PM
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DAVID GOOTEE
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Will do.
Feb 23, 2020 at 4:17 PM
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DAVID GOOTEE
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Before i replace fuel pump, I noticed i could hear fuel pump come on. does that mean fuel pump is okay?
Feb 26, 2020 at 7:39 AM
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ASEMASTER6371
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No, it does not. You can have the pump working but if the pressure is too low, it will cause your issue.

Roy
Feb 26, 2020 at 9:11 AM
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DAVID GOOTEE
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Thanks again.
Feb 26, 2020 at 10:02 AM
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ASEMASTER6371
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You are welcome.

Always glad to help.

Roy
Feb 26, 2020 at 11:12 AM