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Engine high idle and surges, code P0171

Tiny
DANA M. JOHNSON-DAVIS
  • MEMBER
  • 2013 MAZDA PROTEGE
  • 4 CYL
  • 2WD
  • MANUAL
  • 100,000 MILES
When the car warms up it begins to high idle and then it surges and almost shuts off and then it surges back up and it shuts off and it continues. Sounds like the car is going to take off or blow up. It seems to be getting worse. The code I get is p0171 high idle. What are some common issues with this model of car?
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Thursday, March 4th, 2021 AT 7:49 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,702 POSTS
Can you please shoot a quick video with your phone so we can hear the noise? that would be great. You can upload it here with your response. The code says the engine is running lean which this guide can help but I would not try to fix this part until the engine noise is resolved which can fix the code as well.

https://www.2carpros.com/articles/repair-lean-mixture-codes-p0171-or-p0174-on-some-manufacturers

Please run down this guide and report back.

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Friday, March 5th, 2021 AT 8:16 PM

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