IACV (Stepper Motor)

I recently removed and cleaned the throttle body on my 97 VDP. Huge difference when driving and throttle is super responsive. I installed an aftermarket IACV which came with a red O Ring but no spacer or gasket. I did not use the O-Ring - I re-used the spacer washer and gasket (both in good shape) with HEX (Allen) keys screws and split washers.

As I am still dealing with a small idle issue I ordered an aftermarket one from one of our trusted suppliers. It came including:

a.Valve
b.Screws & O-Rings
c.Red O-Ring
d.Aluminum Spacer Washer
e.Gasket

What is the red O-Ring for in addition to the spacer washer and gasket?

Interesting that the stems on the aftermarkets are shorter than the original one.

Incidentally when I cleaned the original I found it easy to move the cylindrical part and was concerned it might not be seating correctly when on the car. Perhaps someone who has cleaned and re-used the original IACV would comment.

Gary

Hmm, not sure how the shorter plunger is going to seal?
I cleaned mine when I had the XJ40 but that was a few years ago now.

I understand the PCM extends and retracts the pintle. It would appear that when the valve is new the pintle is not fully extended. That would explain why the car went to 3k rpm when I first cranked it up after putting the new valve in. I had to turn it off and on 3 times before it settled back down first to 1,200 rpm and finally to its correct resting place of 700rpm.

When I take out the first aftermarket valve I should see the pintle fully extended if I understand correctly how it behaves.

Gary

Pintle does extend when operating. I discarded the O-ring. Car is idling & running super after a week.

Gary

Good to hear you have a result.