Alright I have experimented a bit with the Intake
I have and it calls for the VSV for the butterfly valve to remain electrically connected (blue connector) though absent any connection to a vacuum line.
I tried several configurations to "trick" VSV which I am sure has caused some CEL probs during the recent past and during my experimenting...I even tried to leave the VSV unconnected both electrically and through vacuum still a CEL.
Logically I thought if the VSV got a protected air supply from the stock airbox, why would this valve be left open to suck in dust and other contaminants that will clog it, like mine was as I found out during my testing.
So I referenced my part list for my old Supras' and found an answer to protect this $104 VSV and just maybe prevent CEL's caused by Intakes
that have this electrically connected but not vacuum connected or not connected at all where the computer might see an open circuit and trigger a CEL, and if this has been done before my bad for a double post, but the part is a VTV Filter (Toyota P/N 90925-06006 @ $2.85 ea.) x3 for an 86.5 or 87 Supra NA or Turbo.
I am attaching pics of the part and how I put them on the Butterfly VSV. I have driven my Celica about 500mi witout a CEL something I never did before I had a problem with spark plugs (non related to Intake
) and was forced to go back to stock for quite some time.
Maybe someone can find a generic filter of similar design to reduce the high price of Toyota's part.
Edit (paragraph for silver