Under today's EPA rules our cars can't burp or belch or fart into the environment, instead they are required to swallow these extra gasses back to the cannister and the gas tank, There is now about 2lbs of pressure in the tank and return lines, A part of the Computer monitors this system called the EVAP system, if the pressure drops, the computer sets the MIL, or check engine light, and set a numeric code in memory. With scan tools we can retieve thiese codes and fix the problem. In your case there was an EVAP code set, and we need to know what it was so we can suggest the next step! The popping noise may be related to a hole in the exhaust. Or perhaps a slight backfire.
Tuesday, September 11th, 2007 AT 6:48 PM