Help with CEL

[Gelbster]

Those of us who have been digging in the SAI rabbit hole would tell you the problem is access. Renntech has some excellent threads with diagnostics. A lot of dismantling and part removal is required to do a really thorough job. Anything less may result in a re-do. Consider replacing all the vacuum lines with good quality silicone hose and brass fittings. There are 2 valves to check - buried behind the alternator and the vac accumulator(leaks in the base?)
One awful issue often overlooked is that the SAI ports in the cylinder heads can become plugged with carbon.
Good luck !

[boxfix]

I had the same SAI code problems.

I found that the check valve on my 2003 had fallen out of the rubber manifold. I fixed this with a brass barged fitting that I plugged into the rubber manifold and they used a piece of high temp silicon tubing to connect it to check valve.

I also found that the vacuum reservoir was leaking. This is a common problem. I tested the installed reservoir with a vacuum pump and gauge. It would not hold vacuum. A new reservoir is a little more than $20. I installed a new one and hooked up a vacuum gauge to the system and pulled 16 Hg to 19 Hg. Which is good and where it should be.

With these fixes my vacuum problems were cured.