Near stall on deceleration

2016 SUBARU WRX
62,000 MILES • 2.0L • 4 CYL • 4WD • MANUAL
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JHOWE602
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  • 1 POST
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.
Jun 8, 2022 at 6:29 PM
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STRAILER
  • ✓ASE Certified Mechanic
  • 54,832 POSTS
  • ASE Certified Mechanic
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

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Jun 9, 2022 at 7:10 PM
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