I will do the talcum test/paper towel test in the morning. I tightened all of the clamps under the hood (inc. under throttle cover) earlier today. I did not check the carbon canister or its direct connections but I will do that in the morning as well. The car has been parked since Oct. Only cranked it to see if the smell disappeared after tightening the clamps. It hasn't disappeared yet. I must say this is one of the most annoying problems ever. Do you mean o-rings as in dealing with injectors?