Greg,

I thought I had AMM problems for a while (which turned out to be O2 Sensor) and here's what I learned.

1. When you unplug the AMM, the idle should become noticable rough... This is called "limp home" mode, where you CAN drive it, but it will run poorly.

2. Make sure you are checking voltage, not testing the circuit... In other words, make sure you arent sending a voltage TO the AMM instead of reading the voltage FROM the AMM (I've heard that this can damage the ECU)

3. What's the condition of the eBay purchased AMM? Here it is: If you unplug the "original" AMM without a change in idle, then you install (and unplug) the "ebay" AMM and the same result? Probably the eBay one is no good, and I feel bad tellin you that because it sucks you know?

I hope this helps a little, If I were you, I'd look on some of the 700/900 FAQ websites as the AMM works exactly as it does with B230F engines in the 7/9 models as well...

Happy trails and best of luck

Spencer