That's when OPEC realized they were losing market share and they turned on the spigots. It overcame the weakness in the dollar.
The part about OPEC turning on the spigots in '86 matches with the fact that the price of oil fell big time. The part about overcoming the weakness in the dollar doesn't fit with the fact that from '86 to '95 the dollar lost a third of it's value --a much bigger drop than the 'crisis' we got now.