01-27-2012, 01:49 PM
Did you re-set the ECU? Funny as it may seem but even for a CAI swap you should re-set the ECU. That sulphur smell is indicative of your A/F mix being off. The Focus ECU is adaptive but only to a point.
Disconnect the negative battery cable for 15 minutes, reconnect and the smell should go away.
Disconnect the negative battery cable for 15 minutes, reconnect and the smell should go away.