2005 Pontiac Bonneville Support Question
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Question posted by ctetzlaff on December 12th, 2012
Check Engine Light
Current Answers
Answer #1: Posted by roadrunnertim on December 12th, 2012 2:05 PM
The gross leak in the evaporation system code is a fuel vapor problem. It means your gas cap is defective or there is a crack in the fuel filler neck or maybe a bad fuel tank vent hose.The EVAP system collects fuel vapors and delivers them to the intake manifold, where they are burned with the normal air/fuel mixture.
Buy a new gas cap and hope for the best. If that doesn't solve the problem, you will need to go to a good garage that has a clue. You can ignore the problem for a little while if the car runs okay, but you car will eventually run poorer and poorer if you do not replace the damaged part.
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