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Originally Posted by texasprd
2000CA - Can you tell me where, under the butterflies, it begins?
I have the three ports on the front of the TBI that are horizontal (PCV, EGR/AIR, evap) - the only other thing I see that looks like it could be exposed to manifold vacuum is between the butterflies, just behind the throttle shaft (a vertical passage when the TBI is on the intake). If this is it, I may not be able to do much with compressed air because there are side-slots that will allow the air to escape. I did try going up through it w/ stiff wire, and also spraying injector cleaner - it didn't appear to do any good. Going from the outside (vac hose end) of the MAP port, I sprayed cleaner in and it didn't come out anywhere else.
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Take a small drill bit and hand screw it threw the pipe/hole.
When screwed threw you should see the end of it pop threw there.
That old carbon gets tough.
MT