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Vacuum leak help

 
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  #1 (permalink)  
Old 10 Jan 2011, 07:40 pm
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Question Vacuum leak help

Hi,
After changing the wires/plugs there seems to be a vacuum leak, a hissing noise. I've checked the obvious connections. I've checked the pcv hose, hose connections behind the manifold, throttle body etc. Any suggestions would greatly appreciated.

Thanks
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Old 10 Jan 2011, 07:44 pm
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Default Re: Vacuum leak help

Since you just changed the plugs and wires I'd check the area around where the upper and lower manifold come together.
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Old 10 Jan 2011, 08:12 pm
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Default Re: Vacuum leak help

Whats the best way to check it?
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Old 10 Jan 2011, 08:20 pm
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Default Re: Vacuum leak help

Get a can of WD-40 and while the engine is running spray around the two halves of the manifold and listen for any change in idle.
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Old 10 Jan 2011, 08:27 pm
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Default Re: Vacuum leak help

If there is a change. I'm assuming it's not been tightened correctly? It makes a puh noise when I turn the car off.
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Old 10 Jan 2011, 09:08 pm
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Default Re: Vacuum leak help

Gasket may not be sealing, unless it was twisted upon assembly they are reusable. The torque isn't very much around 12 inch lbs, I think, I usually just snug them down using 1/4" socket ratchet. Good Luck!!! Let us know how you make out.
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Old 10 Jan 2011, 09:08 pm
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Default Re: Vacuum leak help

Sounds like you need to take it apart again, check the 4 rubber gaskets and very careful when putting it back together. You also need to tighten the 5 bolts down to specific torque.
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Old 10 Jan 2011, 09:51 pm
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Default Re: Vacuum leak help

I'll let her sit until the weather gets better. I'll repost once I take it apart.
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Old 11 Jan 2011, 08:25 am
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Default Re: Vacuum leak help

Quote:
Originally Posted by discovering06 View Post
I'll let her sit until the weather gets better. I'll repost once I take it apart.
IF you wait to long the twisted (if it is) gasket may keep the twist and will NOT be able to seal.
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Old 11 Jan 2011, 09:41 am
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Default Re: Vacuum leak help

I checked the gaskets this morning and they are not twisted. (seated properly and tightened the intake manifold correctly). Still hissing somewhere.
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