Date registered: Mar 2005
Vehicle: '01-E320 & 02-ST2
Location: John 15:18-19
Mentioned: 0 Post(s)
Quoted: 35 Post(s)
Please note that you're more likely to get model-specific help when you post in the forum specific to your car, rather than this general one which is really quite broad.
The valve you're talking about is the purge valve and the ticking is normal.
I would get the codes checked. That the CEL went out is meaningless, as you'll still have codes stored. Find out what they are and then you can figure out if it's something that can be ignored (a transient) or if it's a sign of impending issues that might be costly or leave you stranded (or both).
Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy; its inherent virtue is the equal sharing of misery. (Winston Churchill)