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09-02-2014, 11:09 PM
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#1 |
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Registered User
Join Date: May 2010
Location: Kansas City, Kansas
Posts: 5
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Weird sound turning truck off
I have a 72 c10 350v8. Sometimes when I turn it of the engine will make a shhhhhshhshh sound. it dosent do it every time, maybe every 7th or 8th turn off. Does anyone have any ideas what this is?
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09-02-2014, 11:14 PM
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#2 |
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Registered User
Join Date: Jun 2010
Location: Upland Ca
Posts: 4,141
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Re: Weird sound turning truck off
Run on maybe?
__________________
1972 C10 SWB, Air, PS, PB, 350/350THM. Second owner. 1965 Corvette roadster, 44K miles, 327/365 SHP, 4 speed, side exhaust, knockoffs, teak, second owner (bought in 1970), Have ALL numbers matching components. My frame off restoration thread: http://67-72chevytrucks.com/vboard/s...d.php?t=556703 |
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09-02-2014, 11:36 PM
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#3 |
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Registered User
Join Date: Jan 2014
Location: Sacramento,California
Posts: 696
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Re: Weird sound turning truck off
Sounds like vacuum bleeding off. Could be a leak in the diaphragm for the brakes if you have a booster. Or maybe in the HVAC system
__________________
Built not bought! My dad always tried to convince me HEI was pointless! Welding is a lot like sex, you don't have to be great with the rod as long as you thoroughly prep the surface and your good at grinding  My build : 68 C10 Short Bed Conversion |
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09-02-2014, 11:47 PM
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#4 |
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Registered User
Join Date: May 2014
Location: Corona California
Posts: 26
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Re: Weird sound turning truck off
A/c compressor will do it too, If you have it.
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09-03-2014, 12:07 AM
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#5 |
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Registered User
Join Date: Oct 2013
Location: Rt 66 Gallup, NM
Posts: 527
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Re: Weird sound turning truck off
Hard to tell without hearing the noise. Could be PCV is stuck.
__________________
2005 GMC K2500HD D/A 1993 GMC K1500 2011 Subaru Legacy. 2013 Subaru Outback 1970 C-10 2WD, SWB stepside, 292, TH350, PS, more rust than anything. God is my pilot. 
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09-03-2014, 12:38 AM
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#6 |
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Registered User
Join Date: May 2010
Location: Kansas City, Kansas
Posts: 5
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Re: Weird sound turning truck off
It not a hose or anything, it sounds like the whole engine turning over. What do you mean by a run on
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09-03-2014, 07:25 AM
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#7 |
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Registered User
Join Date: Jan 2014
Location: Sacramento,California
Posts: 696
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Re: Weird sound turning truck off
The only other suggestions I have is a vakve that may be too tight or not seating properly letting compression leak back in to the intake or a loose spark plug, but thats only if your sure it is coming from the engine. You could check both by pulling power from the coil/hei and bumping the engine a little at a time and see if you start to hear it.
__________________
Built not bought! My dad always tried to convince me HEI was pointless! Welding is a lot like sex, you don't have to be great with the rod as long as you thoroughly prep the surface and your good at grinding My build : 68 C10 Short Bed Conversion |
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09-03-2014, 07:32 AM
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#8 |
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Registered User
 
Join Date: Aug 2014
Location: Pittsburgh, PA
Posts: 627
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Re: Weird sound turning truck off
Too much timing can sometimes cause a run on. Double check your timing. It could be as simple of a fix of just turning the distributor a little. Good luck.
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09-03-2014, 09:23 AM
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#9 |
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Registered User
Join Date: Feb 2009
Location: southeasternfoothillsofusa
Posts: 1,557
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Re: Weird sound turning truck off
Having idle speed set too high can cause it. If it keeps on after all our suggestions & it worries you, try cutting it off while still in gear--assuming it is an automatic.
Luck to you, Sam |
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