Quote:
Originally Posted by porschyard
You are correct the solenoid on the right blocks the vacuum retard on cold start for idle speed increase and the one on left is for the air injection changeover from exhaust port to cat converter.
Richard
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Thanks for confirming. That valve is supposed to be thermo timed, so I'm presuming it's wired in to the thermotime switch cold start injector circuit to get its timed power.
Just now bench tested the solenoid. The valve closes when 12vdc is applied to it. So in order for it to advance timing at startup, it needs to close when it sees power and open back up a few seconds later. Guess I'll have to pour over the electrical schematic diagrams to see where it gets its power...if it's getting any power at all that is and may just be permanently open if not. My car ordinarily fires right up and idles at around 1000 initially, mostly due to the AAR action. Not a big issue either way.
No cat on this car, so the other valve is of no consequence but thanks for telling me.