I guess I was unclear. I have read the 'primer'. I also looked in a Hayes manual, Chiltons manual, internet and asked my hotrod building neighbor. It says that the computer decides when to turn the pulse air valves on or off, but not what the computer needs to make a change on or off.
The pulse air valves never worked as far as I can tell, since I bought the <nobr>jeep
</nobr>. I checked both of the hoses and valves and the hold pressure in the direction opposing flow. All of the lines are clear. I hooked a ported vacuum source to the pulse air valve (bypassed the vacuum solenoids) and for the first time ever I heard the reed valves vibrating and I could get a bouncing needle on a vacuum gauge.
I don't know if the vacuum solenoids are bad. If I knew what causes the computer to operate them to open the air valves to allow O2 to flow to the cat-con, I could simulate it and measure the vacuum at the line from the two solenoid valves that are supposed to operate the pulse air valves. Do the vacuum solenoids turn on when operating temp (computer in closed loop) is reached and then stay on? Like I said, since I have never seen them work, I don't know what conditions make them work.
Question: If I leave a vacuum source hooked up the the pulse air valves, so the are always open, will that be detrimental to passing emissions? Or should I just replace the vacuum solenoids before trying to pass emissions.
Thanks for the help though, I really do appreciate the reply!