David_9218

The smog pump on my 91 is missing the hose that runs to the back of the engine where it would suck in exhaust. The smog pump still works, however it is sucking in fresh air. Would it be wise to put a little air filter on the smog pump so that it is at least sucking in clean air? OR... Should I just delete the system all together?

Chris_1

iTrader: (1)

It works the other way. It pulls in fresh and pumps it to the exhaust.
There is a dual diverter valve right at the back of the motor that can direct fresh air either through the heads or down to the catalytic convertor.
It keeps the cats cooler and helps dilute the fumes coming out of your tailpipe.
The pump is low pressure and doesn't really take any power to run so it's just as smart to leave it on.

David_9218

Yes but I was wondering if I should put a little air filter on it?

Chris_1

iTrader: (1)

There's actually supposed to be an air pickup 'muffler' on the fenderwell - between the battery and the vacuum reservoir ; big round thing ? That's where it's supposed to pull air in from.

Chris_1

iTrader: (1)

You can just see about 1/2 of it in this pick - right between the rusty vacuum reservoir and the battery. Hose coming off it that goes down to the air pump. That's where the pump pulls air in, then pumps it out to the diverter valve and from there to either the heads or the cats.

Chris_1

iTrader: (1)

Here's a better picture of it. that's where the air pump draws air in.

David_9218

Yes that is exactly what I'm talking about. What I was wondering, is does the canister filter the air then send it back. Or could I put a little filter on the intake hole on the canister itself?

Chris_1

iTrader: (1)

I never looked inside the canister. I think it's just for sound from what I can gather.
I suppose you could put a filter on if you want, but Ford didn't seem to think it was necessary so I don't think you should have to worry about it.