Access to Secondary Injection Check Valve

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There are no little plastic check valves.

There is a metal vacuum actuated valve just under the intake manifold that can be easily removed without taking any other parts off. The other (check) valve, also metal, is further under the intake manifold and is best accessed from the firewall side (from inside the car), though you will have to remove the alternator.

The electronic valve is near the check valve and is also accessed from the firewall engine access.