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View Full Version : Smog Pump Removal

jag7819
10-06-2002, 12:28 PM
can anyone tell me steps to removing the smog pump???i don't know if im supposed to plug the lines going to the pump or bypass the pump it self?can anyone help
Corey
10-07-2002, 07:52 AM
I got some brass pipe plugs and screwed them into the exaust manifold in place of the air injection manifold. Then just unhook the hoses from the regulator valve and there are two small bolts that hold the metal pipe to the back of the smog pump. I had to get a saw and cut the pipe that goes behind the engine to get it out.

:cool:
Fred Jones
10-07-2002, 10:27 AM
The year of the car helps. I just did it with the help of the people over at thridgen.org and the faq they have. Mine is an 89tpi. After getting an A/C delete pulley and longer belt I removed the pump and hoses. My fittings into the manifold are seized solid so I left the valve on the end of the two stainless manifolds. The valve blocks the fumes.
TransAm12sec
10-07-2002, 02:31 PM
Won't the catalytic converter get clogged up?
Fred Jones
10-07-2002, 03:32 PM
On cars that are nearing 20 years old I would be surprised if they were not already.

The purpose of the smog pump was not to keep the cat clean but to help dilute the emissions. The cat doesn't do anything till its hot. By diluting the emissions the mfg'rs were able to publicize lower emissions accross the whole cycle
TransAm12sec
10-07-2002, 04:08 PM
So its ok to run without a pump for some time, like 1000 plus miles? What about new cats?
Fred Jones
10-07-2002, 07:20 PM
I wouldn't worry about the cat. Many cars do not have an air pump. Most of the high performance cats don't even have the fitting.

Big fear should be the smog police.
Corey
10-08-2002, 08:58 AM
Actually the reason for pumping air into the cat was to raise the temp to aid the chemical reaction of gases.

Most, if not all, modern cats do not require air injection, so if it has been replaced it probably doesn't need it anyway, and most exaust shops don't even bother to hook it back up.
jag7819
10-08-2002, 08:11 PM
thanks for the help..and by the way it is an 87 tpi
Fred Jones
10-09-2002, 03:18 AM
The air being pumped in is cool (from the front of the pump)compared to the red hot exhaust gasses. It was an attempt to continue combustion into the exhaust system with an infusion of O2. Especially when the engine was cold and not running at peak efficiency.