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Sound from Engine Compartment on Shut Off

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Old 09-16-2012, 05:49 PM   #1
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Sound from Engine Compartment on Shut Off

I've only got 150 miles on my Taco. When I shut off the engine there is a rather loud wheezing/wind-down noise that emits from the engine compartment. Stock V6.

Just curious--is this normal? It sounds kinda goofy...

Thanks

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Old 09-16-2012, 06:43 PM   #2
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Quote:
Originally Posted by Sargechris View Post
I've only got 150 miles on my Taco. When I shut off the engine there is a rather loud wheezing/wind-down noise that emits from the engine compartment. Stock V6.

Just curious--is this normal? It sounds kinda goofy...

Thanks

no. have it checked your under warranty
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Old 09-16-2012, 06:44 PM   #3
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or is that the air pump they put on the 13s.
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Old 09-16-2012, 06:46 PM   #4
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My 95 4 cylinder does this and I haven't been able to identify what is causing the noise.
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Old 09-16-2012, 06:46 PM   #5
Slow as shit. Cute as Hell.
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A/C, perhaps.
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Old 09-16-2012, 06:49 PM   #6
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Could be this, which is found in the first couple pages of the manual.
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Approximately five hours after the engine is turned off, you may hear sound coming from under the vehicle for several minutes. This is the sound of a fuel evaporation leakage check and, it does not indicate a malfunction.
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Old 09-16-2012, 06:56 PM   #7
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Thanks for the responses... I don't believe it's the 5-hour noise--it happens immediately on shut-off. Very noticeable. Hard to describe, but maybe I could best describe it like this: If it was a turbo, I'd think it was the turbo winding down... (plus a few additional noises)..

I don't think it's the AC---I turn all systems off before shutting off the engine (old habit).

The air pump does sound like a candidate.

I'm gonna try to get to the Dealer this week. I will advise.

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Old 09-16-2012, 07:00 PM   #8
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Probably the smog pump. Turn the key on for a bit then off and see if you hear it.
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Old 09-16-2012, 09:27 PM   #9
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I am hearing this too and curious on my 2013 Tacoma I got today new. A definite electric winding up noise for 2 or 3 seconds right after shutting off. Any ideas? 4x4 v6 trd. Thanks!
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Old 09-16-2012, 09:43 PM   #10
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Smog pump.
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Old 09-17-2012, 06:58 AM   #11
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Gonna like this forum

Thank you! If sure did sound 'on purpose' but just odd.
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Old 09-21-2012, 11:36 AM   #12
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Any updates? My 2013 does the same thing.
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Old 09-21-2012, 12:06 PM   #13
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Smog pump.
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Old 09-21-2012, 12:29 PM   #15
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Mine does the same. Sounds almost like a turbo. I was going to run it by the dealer and ask just in case but since everyone's I doing it I bet it's normal.
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Old 09-21-2012, 12:33 PM   #16
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Quote:
Originally Posted by Amo-cat3 View Post
Hey Whipper, think it could be the smog pump?
Nah. Something is terrible wrong with everyone's truck and they should just get out and run very far away from their truck.
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Old 09-21-2012, 12:39 PM   #17
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My 2012 has the pump that runs when I start it, apparently it blows air across the cats...If you immediately shut it off, the pump continues to run for a few seconds. If you don't turn off the engine the pump shuts off in about 5 seconds it never turns on again.
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Old 09-21-2012, 04:01 PM   #18
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Made it to the Dealer today.. Had the Tech listen.. right-away he said it was the "air induction system" and a normal sound... I asked if, in layman's terms, it was the smog pump? He said it was.

All is OK per the Dealer...

Hoo-Ray! (but I still don't enjoy the sound!).

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Old 09-21-2012, 04:12 PM   #19
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Smog pump.
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Old 09-21-2012, 04:21 PM   #20
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Quote:
Originally Posted by whippersnapper02 View Post
Smog pump.
And the winner is: whippersnapper!! If we would only listen....
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