i was just removing my engine, and noticed that the air that comes from the air pump runs through, (somehow) the intake system, to a line that runs to the catalytic convertor. i am removing the air pump, and was wondering if i have to make a block off plate where the line attaches to the intake (around that area anyways)...

also why is this? why didn't they just route the line around the intake rather than right through it???

nick

p.s. i am learning alot doing this engine removal. and its all thanks to the help of forum member DufourMike.

 

All you need to know

http://maz_tutorials.ten15.net/Tutorial_1.pdf

 

The pump sends air to the cat, not from the cat to the intake. You will need to block the hole on the intake manifold. Good luck!

 

yeah i understand the air pump pumps air to the cat, i was wondering why the line is routed through the intake manifold (or under it, either way it is a part of the manifold itself)

so i will have to plug up the hole?

 

I think it pulls air from the intake, and yes you do need to block the hole. You can either fab your own blockoff plate, or order one through RacingBeat (for one).

 

The airpump sucks air from the aircleaner housing(filtered air).
The pressurized air them travels from the pump to the ACV, which is the big square valve bolted to the side of the intake.The reason its bolted to the intake is because the air isnt always pumped to the cats through that steel pipe near the bac of the intake.
Sometimes the ACV sends the air to the exhaust ports.To get there,the air first travels from the ACV to a passage in the intake manifold,then down the side of the engine block and into the exhaust ports through a pair of tunnels.
Other times,the air is not needed at the ports or the cats.In that case the ACV sends the air back to the aircleaner.Since the smog pump is moving air anytime the engine is running,it has to go somewhere.Thats what the ACV is for,to send the air somewhere depending on load,temp throttle position,RPM,ect........