PO410 explained, had made my own problem
I had posted how I found the RCM relay for my air pump vaporized and the contact was gone because it was under rated. Well today I metered the pump with my 30 a meter and with the engine running, the reading was BING, the needle buried itself on the HIGH side, well in excess of 30 a as I had predicted in my last posting, On the video I had not metered the pump current yet, to find it was 30++ amps! WOW
94 miles after replacing the relay I got another PO410 codes and the settings had not reset on the computer so I could not get an inspection for emissions !!!!!!!!!!!! AAArgue !
Decided to pull the “ I CALL THEM SMOG POTS “ to see whats up. Found by sucking on a hose that the pots do not pass the air to the exhaust until the vacuum is greater than 10” of mercury. I reassembled the pots and metered the engine vacuum applied. ZILCH NADA nothing, I had no vacuum and that was not opening them, that is why I got the intermittant PO410s.
In checking I found that during my inter-cooler upgrade, all the hoses were off everything and the vacuum check valve WAS REVERSED ACCIDENTLY. By measuring the vacuum at the vacuum pot I was able to see why they were not opening, EVEN THOUGH THEY SOUNDED CORRECT ON START UP that shift in the engine sound at idle after about 30 -45 seconds.
To keep your attention, rather than write it all out, I have provided UTUBE videos of my work, though they are un edited due to the camera shutting off ½ way thru the operation. Watch the videos and see if that helps.
If your getting PO410s hook a vacuum gauge up to the line on the smog pots with a tee to see that your reading about 12 – 15 inches of mercury DURING COLD start-up. If not there's a vacuum issue, hope it helps.
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Last edited by waldig; 09-20-2017 at 08:31 PM.