Does anyone know the function and how the secondary air injection valves work? The two that sit on top of the air lines going into the heads. One of mine is ticking upon start-up when the engine is cold. It only lasts 10-15 seconds. Just curious. Thanks.

 

The are normally closed and open with vacuum during startup. Never heard mine ticking, but normally if there is a problem, you will get P14XX SES code.

Which side? If driver side, are you sure its not the purge valve? Those do tick.

 

It's on the drivers side. It sure sounds like it's coming from the sai valve and even feels like it, but I guess I need to look/listen more closely to the purge valve. Is that a normal sound for the purge valve or does it need work/replacement? I'm not getting any codes or lights. Is it something to worry about? Thanks!

This is what I found in the RAVE for anyone looking at this post in the future:

The EVAP canister purge valve is located in the engine bay at the LH side of the engine intake manifold. The valve is held in position by a plastic clip which secures the inlet pipe of the purge valve to a bracket mounted at the rear of the engine compartment. On vehicles with secondary air injection, the purge valve is fixed to a metal bracket together with the SAI vacuum solenoid valve; the purge valve is fixed to the bracket by two plastic clips. A nylon pipe connects the outlet of the purge valve to the stub pipe on the plenum chamber via a short rubber hose. The connector to the plenum chamber is a quick-release type, plastic 90° female elbow; the connection is covered by a rubber seal which is held in position on the port stub pipe. A service port is connected in line between the EVAP canister and the inlet side of the purge valve and is rated at 1 psi maximum regulated pressure. The service port must be mounted horizontally and is located close to the bulkhead at the rear of the engine bay. The service point is used by dealers for pressure testing using specialist nitrogen test equipment for localising the source of small leaks. The purge valve has a plastic housing, and a directional arrow is moulded onto the side of the casing to indicate the direction of flow. The head of the arrow points to the outlet side of the valve which connects to the plenum chamber. Purge valve operation is controlled by the engine control module (ECM). The purge valve has a two-pin electrical connector which links to the ECM via the engine harness. Pin-1 of the connector is the power supply source from fuse 2 in the engine compartment fusebox, and pin-2 of the connector is the switched earth from the ECM (pulse width modulated (PWM) signal) which is used to control the purge valve operation time. Note that the harness connector for the purge valve is black, and must not be confused with the connector for the Secondary Air Injection vacuum solenoid valve which is grey. When the purge valve is earthed by the ECM, the valve opens to allow hydrocarbons stored in the EVAP canister to be purged to the engine inlet manifold for combustion.
EMISSION CONTROL - V8
DESCRIPTION AND OPERATION 17-2-21
If the purge valve breaks or becomes stuck in the open or closed position, the EVAP system will cease to function and there are no default measures available. The ECM will store the fault in memory and illuminate the MIL warning lamp if the correct monitoring conditions have been achieved (i.e. valve status unchanged for 45 seconds after engine has been running for 15 minutes). If the purge valve is stuck in the open position, a rich air:fuel mixture is likely to result at the intake manifold, this could cause the engine to misfire and the fuelling adaptions will change. The following failure modes are possible: l Sticking valve l Valve blocked l Connector or harness wiring fault (open or short circuit) l Valve stuck open If the purge valve malfunctions, the following fault codes may be stored in the ECM diagnostic memory, which can be retrieved using TestBook/T4:
Canister Vent Solenoid (CVS) Unit – (NAS with vacuum type, fuel evaporation leak detection system only)
1 CVS unit 2 Mounting bracket
3 Spring clips to pipe from EVAP canister 4 Harness connector
The canister vent solenoid (CVS) valve is mounted on a slide-on bracket which is riveted to the cruise control bracket at the right hand side of the engine compartment. The vent pipe from the EVAP canister is connected to a stub pipe on the CVS unit via a hose and plastic pipe combination. A two-pin connector links to the engine management ECM via the engine harness for solenoid control; one of the wires is the supply feed from fuse No.2 in the engine compartment fusebox, the other wire is the valve drive line to the ECM. The solenoid is operated when the ECM grounds the circuit.
P-code Description P0440 Purge valve not sealing P0444 Purge valve open circuit P0445 Purge valve short circuit to ground P0443 Purge valve short circuit to battery voltage