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SteveC · May 2nd, 2006, 03:13

I'm not familiar with the 172SP, but it might be an automatic type. Spring loaded door, and if the pressure gets too low in the intake manifold (due to the air filter being plugged by ice and the throttle valve open) the higher air pressure outside overcomes the spring pressure, opening the door, allowing unfiltered air into the intake.

Just a guess....

May 2nd, 2006, 03:13	#7
SteveC Modulator Join Date: May 2003 Location: GRR Posts: 8,808	Re: Got Stumped...Need Help I'm not familiar with the 172SP, but it might be an automatic type. Spring loaded door, and if the pressure gets too low in the intake manifold (due to the air filter being plugged by ice and the throttle valve open) the higher air pressure outside overcomes the spring pressure, opening the door, allowing unfiltered air into the intake. Just a guess.... __________________ . If life gives you lemons, throw 'em into a quart of vodka. ~Red Green