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Near stall on deceleration

Tiny
JHOWE602
  • MEMBER
  • 2016 SUBARU WRX
  • 2.0L
  • 4 CYL
  • 4WD
  • MANUAL
  • 62,000 MILES
My vehicle has developed an issue where, once it is completely up to operating temperature, when I'm decelerating and coming to a stop it nearly stalls out but catches itself at the last second. When this happens, the idle peaks to around 1,200 RPMs then settles to its normal 700 RPMs. I've replaced the MAF sensor, reset the ECU, and checked the clamps on the upper intake duct and the intercooler.
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Wednesday, June 8th, 2022 AT 6:29 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,322 POSTS
It sounds like you could have a vacuum leak, which you should check when the engine is cold. Also, if no leaks are found I would service the throttle body. These guides can help with specific information in the diagrams below:

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

and

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

Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.
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Thursday, June 9th, 2022 AT 7:10 PM

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