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Idle weird

Tiny
JARRETT.MCGINNIS
  • MEMBER
  • 2016 FORD FUSION
  • 2.5L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 58,000 MILES
Whenever I’m stopped at a stop light or sign it drops rpm's randomly and shakes really bad some worse then others. It also does the same thing when I put my foot on the brake to go from park to drive or reverse. It does it really bad when I drive for awhile and park it and leave it running it will drop rpm's and shake sometimes it drops so much the shake gets worse and feels like the car is going to quit running.
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Wednesday, January 16th, 2019 AT 9:58 PM

2 Replies

Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hi Jarrett, my name is Alex and I will be helping you with your problem today. I have seen the throttle bores get dirty once causes a rough idle I have also seen a MAF sensor cause this. We should run the codes to sewe what comes up.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Please run down this guide and report back.

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Thursday, January 17th, 2019 AT 3:08 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 43,468 POSTS
Hello,

If i could sneak my opinion in, this sounds like it can be a vacuum lean or the spark plugs need to be replaced. Here are two guides that can help with the problem:

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

and

https://www.2carpros.com/articles/stall-at-idle

Please let us know what you find. Cheers, Ken
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Monday, January 21st, 2019 AT 5:40 PM

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