Under the battery, all the way down under the car. You'll have to remove the plastic curtain to access it.
The 1985 Ford Ranger smog pump is located on the firewall in the engine compartment. The smog pump will be on the drivers side of the firewall.
another name is smog pump.this could cause light to come on.
http://wiki.answers.com/Q/Where_is_the_smog_pump_0n_a_2000_chevy"
To remove the smog pump from a Ford E350 van, first, ensure the engine is off and cool. Disconnect the negative battery cable, then locate the smog pump, usually mounted on the engine. Remove the hoses connected to the pump, followed by the mounting bolts securing it to the engine. Finally, take out the pump and cover any open ports on the engine to prevent debris from entering.
To remove the smog pump pulley on a 1992 Ford Thunderbird 5.0, first, relieve the tension on the serpentine belt by using a wrench to turn the tensioner pulley. Next, use a socket and ratchet to remove the bolts securing the smog pump pulley to the pump. Once the bolts are removed, carefully pull the pulley off the smog pump shaft. Make sure to inspect the pulley and shaft for wear or damage before reassembly.
It is located right below the alternator.
pumps smog
The smog pump is also known as an air pump. It's only purpose is to blow more air into the exhaust system to help burn up unused fuel and carbon monoxide in the exhaust.
Smog pumps have not been used for at least 20 years, as far I can recall. My 2000 Malibu does not have one. Better engine controls through electronics have allowed for this.
driverside wheel well in behind the front bumper
The 2001 Oldsmobile Aurora smog pump can be found on the left-hand side of the engine. The smog pump will be near the exhaust manifold.
Go to Autozone and get an 88.2-inch 6-rib serpentine belt. This will effectively bypass the smog pump and keep all other accessories operational.