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Jeez, I hate wiring diagrams. They fail to show you everything. Of course, the only CI Fuel Injection System book I have (can find) is for the 78-80. Anyhow, not the little two connector computer (CIS), but the larger one (CI)that sits above it. I should never attempt to answer questions when I'm tired! For the car I had the running rich problem on, it was the CI computer. For the car that was zapping the #13 fuse, it was the CIS computer.
I'm not EVEN saying that the computer is the problem since I don't know how extensive the previous owner's or the previous owner's tech's volvo knowledge was. I do suspect though, that the modification occurred to provide power to the pumps, and while doing so eliminate enrichment problems. The only component that I can see going through this bother for would be the computer UNLESS someone didn't have the knowledge to just unhook or replace whatever component was really causing the problem.
If memory serves me, isn't there two "switches" that look alike? One for acceleration enrichment, and one for overload protection. The disconnected black wire WOULD, in theory, be what someone expected the problem to be. Maybe the car was overboosting and killing the power to the relay, and the bypass was set up for that. Maybe they thought they were bypassing the enrichment pressure switch, not the overload protection switch. Maybe there were two problems. It usually is when it kicks your butt.
Chris
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