Question about Pontiac Grand Am
The first thing to do is replace the gas cap with a GM part. If that does not resolve the code, a thorough inspection of the Evaporative systems needs to be done. If a small leak is present in the fuel return path, the ECU will set a code.
Posted on Sep 08, 2010
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Posted on Jan 02, 2017
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Remove and reinstall the gas cap, clear the code, and drive for a day and see if the codes come back.
Inspect the EVAP system for cuts/holes in tubes/hoses
Inspect for damaged or disconnected hoses around the Evap purge solenoid
Check and/or replace the sensor
Check and/or replace the purge valve
Have a professional use a smoke machine to detect leaks
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