AIR pump/cat delete
Thread Starter
Instructor
Joined: Jul 2005
Posts: 228
Likes: 13
AIR pump/cat delete
I recently deleted my main cat on my '86. Can I simply plug the hose coming off the AIR pump that leads to the cat? I can't swing an AIR pump delete pulley at the moment. I don't however, want to somehow lockup or damage the AIR pump by plugging the hose. Thanks.
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
The default mode for the A.I.R. switch solenoid is pumping air into the rear cat, so you don't want to plug it. It probably spends about 90% of its time in this mode.
The ECM adds a bias to the O2 sensor reading when the A.I.R. switch solenoid is pumping air into the exhaust manifolds. This doesn't happen very often (mainly while decelerating), so I don't think it will be a problem.
The ECM adds a bias to the O2 sensor reading when the A.I.R. switch solenoid is pumping air into the exhaust manifolds. This doesn't happen very often (mainly while decelerating), so I don't think it will be a problem.
Safety Car
Joined: Oct 2007
Posts: 4,426
Likes: 229
From: Pennsylvania
Wrong. The air pump feeding the catalytic convertor has nothing at all to do with the fuel/air intake mixture for the engine. That air pump only feeds air to the catalytic convertor. The exhaust in other words. Not the engine. The pump and lines can be left in or taken out if the cat is removed. Leaving the pump and lines in won't hurt anything. I've been running mine without the cat for years and my pump and lines are still in place. It runs perfectly.
Last edited by FOURSPEEDVETTE; Sep 2, 2014 at 08:42 PM. Reason: typo
