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97 Bonneville SE ENGINE 3800 MILES 91,000

Tiny
DARRYL80
  • MEMBER
  • 2012 PONTIAC BONNEVILLE
When starting my car the engine reves up then idles back to normal. The check engine light has came on. The code is PO507 (IAC system rpm higher than expected) and code PO171 (Bank 1 to lean). I changed the 02 sensor and idle air control electric moduler. After I reset my codes the engine light is off but shortly after driving my car the engine light will come back on with the same two codes as stated above. How can I fix this problem?
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Saturday, November 10th, 2007 AT 2:02 PM

1 Reply

Tiny
DENNYP
  • MECHANIC
  • 1,823 POSTS
Sounds like you have a vacuum leak somewhere. Check your vacuum hoses, intake gaskets, and air intake hose for any leaks. You can do this by spraying carb cleaner around these parts with the engine running. If you find a spot that the idle goes down when sprayed, that would be your vacuum leak.
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Saturday, November 10th, 2007 AT 2:13 PM

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