RPMs fluctuating and loss of power

Tiny
AONEAL10515
  • MEMBER
  • 2006 NISSAN MAXIMA
  • 3.5L
  • V6
  • 2WD
  • AUTOMATIC
  • 149,618 MILES
My car has an automatic transmission. Recently I replaced the crank shaft sensor. While they where trying to diagnose the issue with the crank shaft sensor and the ignition lock chip falling outta my key. My car sat for a week. Brake master cylinder being replaced today.

Now I have a different problem. While driving the rpm's fluctuate. It does not happen in idle. Usually, no higher than the 4 mark. It kind of feels like a lost of power. Like I am dragging the back end of the car. Sometimes as the rpm's fluctuates the car will slightly surge. Furthermore, after the car sits overnight in the morning it is hard to start. And it starting to get harder. No grinding or clicking noises during starting. Furthermore, the engine while pressing the gas pedal sounds louder than it should be. Sometimes when I need to press the gas pedal hard and quick like when you merge onto a highway there's a little delay. No check engine or transmission light and no stored codes.
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Tuesday, July 3rd, 2018 AT 10:55 PM

4 Replies

Tiny
KEN L
  • ADMIN
Hello,

This sounds like a classic MAF sensor that is off but not enough to cause a check engine light which is normal. Here is a guide to help you replace the sensor with a diagram below on where the sensor is in your car:

https://www.2carpros.com/articles/how-to-replace-a-mass-air-flow-sensor-maf

Check out the diagrams (below). Please let us know what happens.

Cheers, Ken
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Thursday, July 5th, 2018 AT 12:20 PM
Tiny
AONEAL10515
  • MEMBER
Hello,

I replaced the MAF sensor. Mechanic disconnected the battery and then reconnected it because it was still doing the high/low rpm's. He hooked up a code reader afterwards and it read p0507.

What does this mean? He already cleaned the butterfly. But it was more a quick clean around the opening rather than a detailed clean.
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Wednesday, July 11th, 2018 AT 7:00 PM
Tiny
AONEAL10515
  • MEMBER
Okay, I drove the car today and started acting like it was going to stall and it was hesitating poorly. Now code p0300 appeared.
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Thursday, July 12th, 2018 AT 2:11 PM
Tiny
KEN L
  • ADMIN
You need to clean the throttle body completely by removing it. Here is a guide to help you see what to do, this will make it stall at idle and run poorly:

https://www.2carpros.com/articles/throttle-actuator-service

Please run down this guide and report back.
Cheers, Ken
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Friday, July 13th, 2018 AT 5:43 PM

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