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The correct part number for an '88-'89 NA is 23260-19095. 23260-19075 is for the SC. I am not surprised that the aftermarket catalogs did not differentiate, as there are usually some loose ends with them that make it hard to know what is what. If it turns out that you do need 23260-19095, it's $131.16. Even suggested retail is only $167.82. I think a lot of aftermarket suppliers like to overcharge on weird low-volume stuff like this, hoping that people won't think to check with the dealership.
You tested the CSI system, but you can isolate that thest to the CSI itself. Remove it from the manifold but keep it connected to the fuel rail. Then apply 12V battery power to the CSI (polarity does not matter) and have someone crank the engine. Obviously this is going to cause fuel to spray out of the CSI, so be sure it has somewhere safe to go, and make sure you have a fire extinguisher handy. If fuel comes out of the CSI, that means the CSI is doing its job. It is more likely that you need the cold start injector time switch than the cold start injector; the switches do fail every so often. That is 89462-30011 and your cost is $120.02.
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