Noise when turning off ignition - Mustang Evolution

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Old 12-14-2012, 09:43 PM   #1
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Noise when turning off ignition

When I turn off the ignition in my 03 GT, I here a slight buzz for a couple of seconds. I am thinking fuel pump but not sure. Any ideas?
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Old 12-16-2012, 10:48 AM   #2
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Not much to go on, can you get a recording of the noise?

The fuel pump should shut down as soon as the key is switched off, the f/p relay coil is powered from a source that is hot in RUN and START only--as the pump is under load it should not take more than 1/4 second, if that, for it to spin down.
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Old 12-16-2012, 11:11 AM   #3
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It is so slight, I could not record it. Been doing this since I bought it 9 months ago but i didn't notice it for the first couple of weeks. I don't think it is major, but I am curious.
Thanks for your reply.
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Old 12-16-2012, 11:34 AM   #4
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When I shut mine down the fan runs for a second. Maybe it that. I here when I open the door. Kind of a whining down noise.
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Old 12-16-2012, 12:26 PM   #5
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That might be it.
Thanks
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Old 12-16-2012, 01:18 PM   #6
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No problem.
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Old 12-16-2012, 07:42 PM   #7
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Quote:
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When I shut mine down the fan runs for a second. Maybe it that. I here when I open the door. Kind of a whining down noise.
Exhaust. Pressure in the exhaust system. Bet you putting out very high comps at 10:1 or more.
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Old 12-16-2012, 07:47 PM   #8
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Don't make sense, but adding high HP seems to bring demons all its own. My exhaust make strange leaking sounds when cold. Ghost in the machine. Ha ha!
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Old 12-16-2012, 07:49 PM   #9
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Quote:
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When I shut mine down the fan runs for a second. Maybe it that. I here when I open the door. Kind of a whining down noise.
I can hear mine spin down too. Especially now that my performance tune runs the fan more than the stock or street tune did.

You could have a looks at the fan shroud and make sure there is not some debris in there that could be close to the fan blade, etc.
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Old 12-16-2012, 07:59 PM   #10
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I can hear mine spin down too. Especially now that my performance tune runs the fan more than the stock or street tune did.

You could have a looks at the fan shroud and make sure there is not some debris in there that could be close to the fan blade, etc.
Don't bother. If I know y'all right, you know dang well it's the added performance. Our cars won't sound like 2013 cars. We are pushing the limit. A person can buy a 2013 Stang and never be in the same league as us (we are in a league of our own). Should start a thread on weird sounds our cars make. We are well respected.

About the fan, be glad your fan runs on auto. Mine does not. I monitor temps before shut down just in case. Your PCM fail safe features are fully functional. Quit worrying.
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