According to our database, your vehicle should be equipped with throttle cables therefore there should not be any hissing noise when ignition is turned on, unless it is the fuel pump working too loudly.
If the hising noise is only when engine is started, either you have a vacuum leakage at the air hose or you have an after market air filter.
What bypass hoses did you disconnect, air or coolant?
So presently you do not have any trouble codes, did you erase them preciously?
You mentioned the wordings "EV" flashing, I am not sure what you are refering to.
Friday, January 6th, 2012 AT 10:21 AM