Air Pump question...

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Aug 19, 2003 | 04:24 PM

#16

drewstealth

Thread Starter

Registered User

Joined: Mar 2003

Posts: 1,623

From: Fairfield, ca

No it just makes more open space under the hood which is nice.

Aug 19, 2003 | 04:40 PM

#17

Injuneer

Administrator

Joined: Nov 1998

Posts: 71,094

From: Hell was full so they sent me to NJ

Quote:

Originally posted by drewstealth

"The Air pump is not electrical.. It does not turn on and off. It's on when the engine runs as it is belt driven. Also it is not used to warm the cats.. The Air Pump simply injects air into the exhaust pipe before the oxidizing catalyst to help in the oxidation process of harmful exhaust emissions.
If you remove it you can bet that emissions will go up some. And like I said it's on all the time.. Not just when you start it up.
Hope this helps."

That description is also correct for the 3rd Gen F-Body AIR system.. it was belt driven, ran all the time, and there was a diverter valve that fed fresh air into the exhaust manifolds at startup to heat up the cats. After the cats were warmed up, it diverted the flow to a pipe on the rear chamber of the cat, to allow the cat to oxidize HC's and CO. It ran all the time. The cat had two distinct sections... a reduction system to get rid of NOx, and an oxidizing system to get rid of HC and CO,

The 4th Gens switched to a cat that does not require a seperate air feed to oxidize the HC's and CO. So, they changed the way the AIR pump operated, making it electric, and piping it ONLY to the exhaust manifolds, to heat up the cats on startup.

Aug 19, 2003 | 04:49 PM