Rough idle?

NOAH956

MEMBER
2019 FORD MUSTANG
5.0L
V8
2WD
AUTOMATIC
44,000 MILES

When at a red light or at a stop my car will begin to shake and it has turned off a few times. I’ve already changed spark plugs and ignition coils, and cleaned throttle body. The rpm idle of the car seems relatively low. In the video I rev the engine to nearly 4,000 RPMs and the air to fuel / ratio will fluctuate and the car begins to shake moments after that. There hasn’t been a check engine light but a few days ago after putting gas I got a “check fuel inlet “ message on my dash.

Video (Click to make bigger)

3 Replies

KEN L

MASTER CERTIFIED MECHANIC
48,420 POSTS

It sounds like you may have a vacuum leak, I would check the engine when it is cold only, by following this guide:

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

Also, you could have an MAF sensor that is going out as well. I would remove the sensor and try to clean it.

This guide can help as well:

https://www.2carpros.com/articles/mass-air-flow-service

The sensor location is in the images below.

Check out the images (below). Please let us know what happens. Also, when you replaced the spark plug did you use OEM?

Image (Click to make bigger)

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Tuesday, October 25th, 2022 AT 9:59 AM

NOAH956

MEMBER
24 POSTS

Hello, I just wanted to give a quick update on my car since it has now been fixed. I was also reading up on a common issue that these newer model Mustangs have in a Facebook S550 Mustang group Forum. Some people in the group had similar issues to mine that they didn’t have a check engine light, car was shaking at idle. I also did notice my gas mileage had gotten worse too. But they put it out there that the problem was a VVT Solenoid. 2 weeks ago, while driving I finally got a check engine light; I took it to AutoZone and received code P0022. Took it to Ford a few days later just in case it wasn’t the cam phasers, and they diagnosed the vehicle with a failing VVT Solenoid. After fixing the VVT solenoid in bank 2 all has been well with my vehicle.

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Thursday, November 10th, 2022 AT 8:18 PM

KEN L

MASTER CERTIFIED MECHANIC
48,420 POSTS

Hi Noah,

Thanks for getting back to us. Glad you could get it fixed, that kind of problem can be tough. The trouble codes really helps us go in the right direction. Please use 2CarPros anytime we are here to help.

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Saturday, November 12th, 2022 AT 9:10 AM