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I had SAI codes and a "Ready Status" Fail flag so my car failed the Test-Only California Smog Test. I completed a tedious project to trace,check, repair and upgrade the entire system. Not a simple weekend task !
I fixed it all and passed Smog 5 days ago.During this honeymoon period I disconnected & plugged the SAI pump hose to simulate a failure, connected the Particlewave circuit to test it. It worked. I then disconnected it and reconnected the SAI hose.No codes. This morning the codes came back !
Knowing this may be an endless cycle of failures/fixes is not attractive.
This is why the circuit from Particlewave is useful to me. I can just fit his circuit now, delete the CEL with a simple code reader and repair the SAI system(again) when I have time .
For those curious about the SAI vacuum upgrades I made - most of the vacuum connectors are now brass and the hose is good quality 3mm silicone.Should outlast the car -& me ! I also rebuilt the SAI pump and have a rebuilt spare. TheSAI pump still operates perfectly - I can hear it.The vacuum system which is easy to test(but tedious to fix) still holds perfect vacuum. So it is probably the electric change-over valve, or.......
For the Durametric users - if you are looking for the pre-cat O2 Sensor voltage to prove that the air injection system is working/failing - remember two things
1. The ports in the cylinder head can plug with carbon(mine is a newly rebuilt M96 so no problem.
2. To see the graph of the flat wave form change to sine wave(the proof) on the pre-cat sensor - start the car at the coldest possible temperature and be really fast with your keyboard skills.At Los Angeles summer temps you have no more than 5-10 seconds before the flat wave changes to sine wave in my experience. If you are slow you may make an incorrect diagnosis.
Last edited by Gelbster; 05-30-2017 at 08:01 AM.
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