Manually operate the SAI pump?

[thstone]

In normal operation, the secondary air pump will operate under two situations: (1) At cold start to reduce emissions, and (2) to pressure test the integrity of the SAI and fuel vent system. There are valves that need to be set for the system to operate as intended in each case.

It seems likely that you could set up a dash switch to power on the pump and set the valves to allow the system to operate in the cold start mode.

The SAI pump is controlled by a relay. Send power to the relay and the pump will turn on. Check a wiring diagram to see if the valves are also relay controlled or directly powered (my guess is they are directly powered) and similarly set them to the correct configuration.

Someone here on the Forum probably knows which valves need to be open and which are closed during cold start operation. Alternatively, you can manually check them by using a Durametric to manually power on the SAI pump and then checking to see if each valve is on or off.

I do not know what effect this modification might have on the catalytic convertor.