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Old 02-28-2013, 07:34 PM   #1
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Loud hissing sound

NEW Tacoma, 6 cyl, tow package. When the engine is turned off there is a lous hissing [air sucking] sound just after the motor dies. It comes from the engine compartment, passanger side, in front of the firewall from a part covered in a large black plastic cap.

This vehicle was just driven home from the dealership, but they are closed.

Any ideas
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Old 02-28-2013, 07:36 PM   #2
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Normal . Forget About it.
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Old 02-28-2013, 07:46 PM   #3
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Tacoma Mike... Thanks for the quick feedback. Can you tell me what causes the hissing or what it is a part of? Thanks again.
thumpertx
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Old 02-28-2013, 07:49 PM   #4
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It's something to do with the air pump for the emissions on the truck. They started that with the 2012 model year.
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Old 02-28-2013, 07:50 PM   #5
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Smog pump aka emissions thingy..sucks air out of something..lol
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Old 02-28-2013, 07:56 PM   #6
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Quote:
Originally Posted by thumpertx View Post
Tacoma Mike... Thanks for the quick feedback. Can you tell me what causes the hissing or what it is a part of? Thanks again.
thumpertx
It's Uncle Sam Emmisions. They added air pumps and valveing so you hear the "Burp" on shutdown. We have had almost everyone say something about this on a test ride the first time they got in it. On my 2011 the big thing was the abs check on the first take off. It's always something. Wait till you walk by it at night and it starts making noise . Hehehehe.
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Old 03-01-2013, 12:42 PM   #7
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It's totally normal. It weirded me out too when I got my 2013 because my 2011 Tacoma didn't do it.
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Old 03-01-2013, 06:05 PM   #8
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Thanks for the assurance guys. I was a tad panicked when I first got home and turned the truck off.
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Old 03-01-2013, 06:10 PM   #9
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Quote:
Originally Posted by Tacoma Mike View Post
It's Uncle Sam Emmisions. They added air pumps and valveing so you hear the "Burp" on shutdown. We have had almost everyone say something about this on a test ride the first time they got in it. On my 2011 the big thing was the abs check on the first take off. It's always something. Wait till you walk by it at night and it starts making noise . Hehehehe.
Kind of like when my SC inter cooler pump randomly cycles.
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Old 03-01-2013, 06:37 PM   #10
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Here's the best thread about it that I know about.

http://www.tacomaworld.com/forum/2nd...shuts-off.html
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