Quote:
Originally Posted by SVOboy
You also need the 5 wire o2 sensor. I believe that's it though.
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They didn't have 5-wire O2 sensors on cars in 1991. The HF uses the same narrow-band sensor that most cars on the road do. It doesn't run in lean-burn mode, it just has a small engine geared very tall pushing a lightweight and somewhat aerodynamic shape around.
I believe that one of the differences between the 49-state HF and the CA-spec one is that the CA one is geared slightly shorter. Though I have read conflicting information on that...
-soD