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Yhe air pump is relatively easy to replace. As is the check valve. Remove the battery and battery tray. Attached to the frame rail under the batt tray is the air pump bracket. Follow the large hose down from the air filter housing, you cant miss it. Remove the 2 12mm bolts mounting the bracket to the frame rail. Pry off or cot the hose clamps to the two hoses at the pump,1 large and 1 a bit smaller. Remove the screw attaching the negative battery cable to the body. This is also the air pump motor ground point. Lift the bracket and work the pump up and out. There are two cable ties that attach the wiring to the bracket. These will have to be removed ir cut. Once out, unplug the car wiring from the relay. Unbolt the bracket from the pump and unplug the relay. remove the bracket, Unscrew the three rubber mounting lugs and transfer to the new pump. Reinstall the bracket. At this point, inspect the relay terminals. If they are badly corroded, I would replace it. Plug the relay back in, and reconect the car wiring to the relay. Resecure the wiring to the bracket with tie straps and work the pump back into the car. There is a small hook on the bracket that slips into a hole in the frame rail to help locate the pump. Bolt the bracket in place and reinstall the hoses with standard hose clamps, reattach the pump/batt ground cable, batt tray and battery. The check valve sits on top of a pipe above the exaust manifold. Two 10mm bolts from the underside, and two hoses. 1 aboyt 1" diameter, and 1 vacuum tube. Remove the hoses/bolts, replace the valve/gasket, reconect the hoses. I recomend replacing the vacuum hose too. It's purple, and the other end conects to a solenoid at the radiator fan shroud. I've seen these hoses have debris inside that contaminates the solenoid. Hope this helps. P/S. I do these in about 20 minutes, but I've done quite a few. Expect 2-3 hours and a 6 pack.
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