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Old 03-15-2011, 08:57 PM   #16
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EVAP system


even if it fails emissions, you can still pay $200 to a shop to do "reasonable repairs", bring slip back to emissions station, and you are good for another 2 years. old clunkers around here are exempt from emissions anyway. and many of them run better than all those electronics filled tin cans.

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Old 03-15-2011, 11:39 PM   #17
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EVAP system


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Originally Posted by ukrkoz
hey, what kind of GM vehicle is it? some of them had gas tank intakes reported loose, resulting in that code. apparently, if there's a leak, it is minute and takes time to come back.
It's a 2004 cavalier
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Old 03-22-2011, 02:38 PM   #18
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i think it happened 2nd time gas cap code came up on my wife's RX300, when i had to reset code twice. have battery disconnected overnight to really clear it. or, if you can locate ECU fuse, pull it out overnight, so that you do not have to re-set all radio and clock settings.
you want Seafoam motor treatment that is in a white cap bottle. Red cap one is for transmissions and is called Transtune. works very well either for its purpose.
you can not pour it directly into the tank. you will need a narrow funnel to pour it in. best way to do this is to buy it, have funnel handy, get to the point when you have time (weekend?) and tank is needing refill. find a major auto parts store next to freeway and a gas station. drive to parts store, ask them to reset code, or pull fuse out for maybe 20 mins to reset it. then go to gas station, pour Seafoam into tank and FLUSH IN WITH GAS. go on freeway, and go for maybe 30 minutes trying to keep speed at maximum legal level. gets engine real hot and blows Seafoam well through the system.
if that code still comes back, you will need what is called a leak tester, to determine where leak is coming from.

keep in mind, you did not have that code for 2 days. if it's THERE, it normally comes back in several minutes after reset. hence, we do have at least some positive result from new cap.
make sure you do not top fuel tank. i do 2nd click and it's enough. trying to top tank can cause gas vapors problems, causing that leak code.
Did all of this and the code came back after 2-3 days. I'm just gonna leave it
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Old 03-22-2011, 03:51 PM   #19
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EVAP system


yeah, will take specialized equipment to track the source. Cavaliers are not bad cars though... esp with V6 in them. lots of power for the size.
sorry, simple cures not always work. at least, now you drive a clean fuel system car.

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