Ya, I'm thinking the ALDA might work it's way on again, shimmed up, to keep the richness down. I don't want to crack the top off and twist the screw, I'd rather shim.. somewhere I saw a comparison of what one oil plug shim (same diameter and everything!) is equal to in turns-of-the-screw.

You're right, the ALDA is the correct overboost protection. Test that sensor, putting the overboost vac switchover back in, and its tubing, and making sure those tubes stay un-sooted.

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Cheers!
Scott McPhee

1987 300D