I turned the ignition off and was sitting in my car for about 10 minutes and heard a high pitched noise. I thought it was my ears ringing so I blew it off. It got a little louder so I then thought it was something going on with construction near by.
I then got out of the car and that its when I heard the noise under the hood. Lifted the hood and it was indeed a high pitch noise (almost like a vacuum cleaner) and a very strong odor of electrical wiring burning.
I knew I needed to do something so I started the engine back up and this was followed by some smoke (not too much). after about 1 minute the noise went away but the smell was still strong. I had to go into work and haven't been able to check it out really good yet.
Question is, what runs with the ignition off that would make this noise near or above the water pump or maybe close to the air clear cover? It is not the electrical fan as the smoke was not even close to that area.
Thanks, Jim

 

The only thing that I can think of that might run when engine is off is the air pump IF the ignition was ON. If the ignition was off I THINK the only thing that should run for a short period is the AC fan if you have it on circulate. What part of the engine did the smoke come from? Did you sniff around to see where the smell was strongest? Does the car still start and run okay? More info needed at this point to help you.....

 

unless something shorted out, making a connection staying hot...like the radiator fan, or air pump...yes sir, more info needed..

 

Yep, need more info as to location.
Was the key in the acc position? The throttle body will click and make a high pitch noise.
The air injection fan might also turn on.
More info please.

 

The key was off and I was sitting in the car for a while before I decided to go into work. It appeared the smoke was coming above the water pump area or just above it. I know the throttle body noise and it wasn't that kind of noise. When I went out to check on the car 4 hours later it started OK but would rev past 1,500 rpm so I reset the gas peddle and that took care of that problem.
I assure you that as much smoke and smell of smoke I was getting that I will have problems later.
Really wish I had more info to give you guys.

 

Sounds like it's the Secondary Air Injection Pump. I had the same thing when mine fried out. You should check the big 40 amp fuse located on the RCM to see if it is blown. If it is the pump the CEL will come on due to the P0410 fault code being thrown. Hope it isn't, as they can be costly to replace, but as I say I had exactly the same issue.