Got a AMM from a junkyard '88 740, hoping it would fit my 240 (as a spare). It checks out fine with the multimeter (as per the tests in Bentley). Unfortunately, looks like the AMM's changed from 88 to 89. If I recall from my reading, the pre-89 ones had a manual idle adjustment. Question: can I use this 88 AMM on my 92? Thanks. --Robert
No. The 88 AMM is adjustable. The 92 AMM is not adjustable.(computer controlled) If the adjustable one is installed on the 92 model it will run very rich and pump out black smoke. The wires wires that come from the brain into each AMM are not the same signals. You could possibly fry the fuel brain and/or AMM if the wrong one is connected. BD
That's what I thought (no go). Thanks for confirming. Anybody want or need a spare AMM? Part number Bosch 0 280 212 007 $50. Thanks.
Yes I need one how do you know that it works? I mean properly, I had a car where it would malfunction and I swapped it from my other car so I could use a spare if it is ok. Let me know where you are as well, please, Dan
Hi Dan, I'm in Canada. The AMM came out of a 1988 740 which I was told was running when it came to its final resting place. I ran the multimeter checks that Bentley recommends and it checked out fine, well within the ranges given (you check resistance at 2 different connector pairs). So as far as I know it should work, but I can't test it on my '92. If you're interested email me offline at and we can set things up. Cheers.
