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1978 Trans Am air cleaner hose routing


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#1 phasedreality1

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  • Year: 1978
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  • Engine: 400 Z Code W72
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Posted 16 August 2011 - 11:09 PM

There is a vacuum hose that runs from underneath the air cleaner through three clips and goes around the passenger side of the air cleaner. I'm not sure where it is supposed to plug in. I have attached a picture of it to this post. If anyone can help, I would be most grateful.

The application is a 1978 Pontiac Trans Am W72 manual transmission.

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#2 TransAmer99

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Posted 17 August 2011 - 04:44 AM

The hose has been cut short, but it really isn't needed. It helps open the stove damper in the snorkle inlet to let in hot air from the stove on the exhaust manifold. It uses carb vacuum to do this, so the hose would have to extend to one of the ports on your carb. Unless you have a vacuum leak, that port has probably already been plugged. You really don't want hot intake air anyway (they did this for emissions and cold-start conditions), since a cooler, denser intake charge delivers better performance. I've been running my '80 without that plumbing for 13 years. If you still have the stove attached via the flex duct, it will pass a visual emissions inspection.

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In the picture, the flex duct from the stove is obscured by the fresh air ductwork, but it is there.
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#3 Greenbird76

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Posted 17 August 2011 - 06:21 AM

Just make sure their is no open vacuum line on the top of the carb or intake manifold and you will be fine.
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