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I am somewhat sceptical that anything at all is 'rebuilt' on these. I am looking at the innerds of an 007 AMM right now, and the only thing that is in there is an adjustable pot, a well made 1 inch square pc board with a couple of chips, resistors etc sealed in what looks to be a silicon gel? of some sort. This is all connected to the sensor wire. Not much to rebuild. I think they ( the rebuilders) are taking in used AMM's ,and just testing them to see if they still meet spec, and posssibly cleaning the sensor wire . I would guess that a lot of these are trashed when they are still good. This AMM came out of an 86 240 that was having problems that pointed to a bad AMM. Erratic crummy idle, stumble on accel which all improved when the AMM connector was pulled. After installing/adjusting another, and then having the same systems repeat in two weeks I started looking for other suspects. What I found was a weak main fuel pump, hard/ suspect intake manifold gasket, hard/shrunken injector o-rings, corroded/bad ground wire terminals on manifold ( not the connection to the manifold, that was clean and sealed, but the connection from the wires to the connectors themselves), corroded fuel injection positive wire connector at battery. Nothing that had failed compleatly, but had degraded way out of spec and were all marginal. When all that was fixed, either of the AMM's would work just fine after they were installed and the CO was adjusted. That was two months ago, and it runs like new. Very happy 240. I think they (AMM) can only process a narrow range of voltages/resistances, and when other engine problems exceed it's ability to compensate they appear to be 'bad'. I am sure there are some that just toast off, but I now have three of these and all work fine when adjusted, even though they have slightly different voltages when backprobed. The one with the top off, is going to the electronic bench/power supply to give its life as a winter day experiment for further study.
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'94 940 150k, '86 240 170k, '72 142 KIA, '70 144 KIA, '69 144 RIP
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