High RPMs during start up

SAMI1064

MEMBER
2008 INFINITI G35
167,000 MILES

When I start the car, the RPMs goes up like I’m giving it gas. It also has a vibration that is felt where your feet go.

Video (Click to make bigger)

Thursday, March 24th, 2022 AT 9:20 PM

6 Replies

JACOBANDNICKOLAS

MECHANIC
109,700 POSTS

Hi,

Does the idle ever go to normal? Also, have you checked to make sure there are no engine vacuum leaks? A vacuum leak can cause idle issues as well as a rough idle.

If you haven't already, here is a link that explains how to check:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Has there been any repairs done to the vehicle recently? Did this start all at once?

Let me know.

Joe

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Friday, March 25th, 2022 AT 2:13 PM

SAMI1064

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11 POSTS

Hi,

Yes, so the car idles fine but sometimes the RPMs fluctuate, and the interior and headlights start to flicker when at a red light and I do hear a faint whistling sound. Only work done was replaced bank 1 catalytic converter.

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Friday, March 25th, 2022 AT 2:43 PM

SAMI1064

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I also attached 2 videos, one with the whistling sound and the other of the RPMs fluctuation.

Videos (Click to make bigger)

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Friday, March 25th, 2022 AT 2:47 PM

JACOBANDNICKOLAS

MECHANIC
109,700 POSTS

Hi,

If the RPMs get low enough, it could cause a lighting issue. The whistling sound has my attention. Can you tell me approximately where the sound is coming from? I'm questioning it because an engine vacuum leak can cause the RPM issue. A leak can cause a whistling sound.

Let me know where you are hearing it from.

Take care,

Joe

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Friday, March 25th, 2022 AT 5:03 PM

SAMI1064

MEMBER
11 POSTS

I’m hearing it from the middle and bottom of the car. Symptoms are low power when accelerating so a vacuum leak is also what I’m leaning towards to as well. Will update you soon hopefully.