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Your AMM having worked in your 740 is encouraging, but not a guarantee your current ECU is always getting a good signal, such as first thing in the morning when everything is cold and connections possibly damp. It could be the AMM has turned bad or, as I suggested, a marginal connection in the associated wiring between it and the ECU.
Time to start using the OBD system for more clues. Refer to the FAQ here for detailed instructions. I presume you're running around with the Check Engine lamp on. Forget any current codes stored, clear them (port #2 and #6) and wait for them to come back fresh so you know what it's currently seeing. You need to begin by clearing them when you've got a no-start situation happening, so first thing in the morning. Begin with the AMM connected, attempt starting a few times. Keep checking for the CE light, immediately read and record all new codes. Now unplug the AMM, start and run. You will immediately get a CE with a missing AMM signal code (now in limp home mode). It will continue collecting any additional codes. Now plug the AMM back in, clear the codes again, restart and carry on running and driving, collecting any further codes throughout the day, periodically checking for any new codes (until you see the 1-1-1 on both ports or the codes repeat when you reach the max 3 code limit). At the end of the day, do a final read. Please report back. BTW, you're not supposed to disconnect and connect the AMM with the engine running or the ignition on, else you risk arcing and possible electrical damage to the ECU or AMM -hope you haven't been doing that. Also, once it's running in limp home mode, I believe it stays in limp home mode until the engine is turned off.
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Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now
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