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Aaahh ...

Missing an E fan.....

Could be that the missing fan completes a circuit.

I have the shop manual for the 1990, official $300 manual, and the diagnostic for the Idle valve is VERY interesting.  On this 1990, you apply positive voltage to the center two terminals of the valve itself (after disconnecting the plug), then apply positive voltage to the remaining plugs (S4, S3, S2, S1) in that 4 to 1 sequence.

Imagine the number of jumpers you need.  Positive voltage to S4, keeping it positive, adding a positive jumper to S3, etc.  At the end of this sequence, the valve will open.

Then, pull the S1 to S4 jumpers.  Then add positive voltage to S1, add to S2, add to S3, add to S4.  Reversing basically.  Then the valve will shut.

4 idle positions.  Once S1 is okay it would open a calibrated amount, then continue to S2, etc for an additional amount, etc, up to S4.

Quite clever indeed.  Some complex little circuitry.

Either the idle air valve is bad, or the missing fan is a culprit.

Just a guess, but imagine the 98 follows the basic logic of the 90.

Hope this helps somewhat.

Generally, this sort of info isn't going to had just from vin#. The build sheet is where this would likely be found. Not sure how easy it would be to get on a 7+ yr. old car. Good luck.

I had heard that run flat tires do not handle road imperfections as well as regular tires.  I have a new 2022 UX 250H and I can attest that what I heard is correct.

Has anyone changed to normal tires for a smoother ride?

Hey Guys,
this is something that we've got going over in the UK forums, and i think we are now up to about 480 pages of it!
So, i thought i'd start it here too!
Quite simple, the word that you associate with the one in the last post, you post up! Please try and keep it clean though!