Well today I purchased the evap valve that is located right beside the oil cap. It looks like the bad one problem was it stayed open all the time. Now I have a question, Will the CEL go away on its own or do I need to disconnect the battery and hope it doesn't come back up? So far I have no rough idle on a cold start and when I fill up the tank it no longer sputters so I think that was the problem. The car runs so much better but the damn light isn't going away.

 

how much did it cost you? and you will have to reflash the ECU either battery or OBD II

 

I could have got it for 34 dollars on gmpartsdirect but I kinda wanted to get it yesterday and have it on before I took a trip to newport last night so I paid 45.95 total and it took me 5 mins to replace.

 

it will go away by it self even if u reset ur ecu or delete the code it will stay off i had the same problem.
its fixed =] i had the same prob with the p0171 that hasnt gone away if my car idles for too long it comes on with p0171 dont know what it is.

 

That sir is your cold air intake. Make sure that all the connections are completely sealed and check your maf and clean it. Mine had that and I noticed I had a small hole in one of the rubber sleeves and once I fix that it went away.

 

CEL will go away after a predetermined amount of full cold to full warm up cycles.

 

Where is it on the LNF?

 

hey can you post up a pic of where it is located for the LSJ? I have the same issue right now p0496.

 

Im not really sure but looking at the lines im guessing its the black piece in the yellow box. One line comes from behind the motor and that line connects to the gas tank and the other one would connect to the throttlebody.



@recklessactn: look for the hard plastic like coming from in front of the thorttlebody and following it towards the engine bay. That line will be connected to it.

 

you should make a how to bc this seems to be a problem people are starting to encouter with there aging cobalts lol

 

What how to replace it?

 

Same problem here. Do you have a part number?

 

gm 12597567

 

Thanks

 

AC Delco part # 2141680...Just a little over $35 for it.

On the LNF, redline4 is right.

On the LSJ, it's mounted on a bracket. There is vacuum line running in front of the s/c going to just the right of the solenoid that needs to come off. The hose with the white clip on it is a little tricky, you have to press one side down and pull on the solenoid (once you take the bracket off the engine and get all the other lines taken off and plugs unplugged). The solenoid has to slide off the bracket so take a screwdriver and pry up the middle prong on the bracket and the solenoid will slide right off

After you put the new one back on, go to your local auto parts store and ask to use their OBDII scanner. At discount auto it's free you just let them see your id while you go clear the code

 

so on the LNF, that piece in yellow just has to be replaced? I gotta look into it, as it seems like a super easy fix on the LNF

 

You don't even have to take off any lines really other than the lines that are connected to the actual evap valve. I just took that bolt off that holds the bracket to the motor and pryed on that clip then It slid off and I put the new on on and took that prong and pushed it back up to keep the valve in place.

Btw, the price ya is 35 shipped but like I said i was willing to pay the extra ten to get it that day. Also it took around 7 good cycles before it cleared on its own.