Most '93s are not LH3.1. Everything I have seen and heard indicates that only cars with manual transmissions in the '90s got the LH 3.1 system - there are very few and conflicting reports as to whether ANY automatic was outfitted with the LH 3.1 fuel system from the factory.
Further, I have read several reports of '93s with manual transmissions that had the LH 2.4 system from the factory.
The general consensus seems to be that LH 3.1 was used in manual cars only, from '90 to '92, and perhaps inconsistently in '93. The original poster is most likely to have the (in my experience) more stable LH 2.4 system.
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