Check engine light blues

[Quik325ix]

Hey guys,

So my CEL keeps coming on when i am going down long hills and the car is just kind of coasting....the car is running fine. Im just wondering what the cause of this might be. Any ideas?

[Jordan]

First thing I would check is the purge valve.

[Quik325ix]

not to sound like a retard....but wtf is that and where is it?

[Jordan]

Its attached to the outlet of your charcoal canister. It purges fuel tank vapor into the intake tract when you are off throttle under engine decel.