I have seen in the 700/900 FAQ that there was an ECU upgrade that compensated for the use of oxygenated fuel (MTBE). The car came from CT which uses the oxy fuel, it now resides in RI which doesn't. I highly doubt that this is the problem but it's one thing to consider. They probably fixed the problem for the '92 model year too...

That's a good theory that you have, my car is LH2.2 which allows me to set my timing and also tweak the duty cycle of my O2 sensor via a potentiometer on the AMM (commonly known as CO adjustment). I set my CO adjustment a few weeks ago (using an LED set up as per the FAQ) and the LED was flashing with a 50/50 (on/off) duty cycle. When I checked it again a week later, the LED no longer flashed 50/50, it was full on. Had to turn the pot to lean the mixture out a bit in order for it to blink again. Then today, for the heck of it, I checked it again and it was full off, had to richen the mixture for the LED to respond... I don't think this is normal and am thinking the AMM may be flaky. Funny though that the car runs like a champ when warmed up.

Let's see if other's respond.

Bean
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'80 242GT 93k, '94 945T 143k, '89 765T 68k (new '94 B230FT)