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Old 03-04-2013, 09:01 AM   #1
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Join Date: Nov 2012
Location: Fulltimers
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Smog Pump-Catalytic Convertor

I have a 1989 Travel Master Class C on Ford E350 chassis with 460 v8 gas.
I was having a problem blowing exhaust manifold gaskets. Discovered catalytic convertor was plugged. When removing Cat. Conv. discovered that the welds to the 2 pipes from the smog pump that go into and out of the Cat. Conv. were not good and effectively not functioning at all.
Have removed the Cat. Conv. and replaced with test pipe. The smog pump is of course 24 years old and very corroded. If I remove pump and all the associated plumbing and then install new belt am I creating any problems mechanically? Will there be any problems with tune or mechanical operation of the motor. I understand that if I would have to have smog inspection I would have to reinstall Cat. Convertor but I am wondering how important the smog pump is? Looks like it really is no value other than attempt in 1989 of Ford to convince EPA it was trying to comply with regulations in place at that time.

Fulltimers 3+ years
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Old 03-04-2013, 11:50 AM   #2
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Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 11,963
Smog pumps were basicaly a lie to fool the test equipment of the day.
They put extra air into the convertor to produce lower #s at the tail pipe, if the cat converors are gone and you don't require emissions testing in your area , removing the pump and pipes will not harm the engine.
All of the BIG 3 used the pumps for a number of years to bring their test #s in line .

99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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Old 03-04-2013, 02:36 PM   #3
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The pump gets fresh air at the exaust to help burn remaining fuel.

Check with DMV to see if it is aged out.

If not all parts need to be in place, maybe not in your location, check first.

The converter can have the guts broken out and left in place.

If it needs inspecton then new converter and O2 sensor, the sensor tells the computer to adjust fuel, they wear out and the mixture turns rich which wipes out the converter.

If you remove pump keep all parts so it can be restored to original if needed
Tony & Lori
1989 Country Coach Savannah SE
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