Originally Posted by
57 Handyman
Update: Received the 24-pin AKDW chip (with EGR deleted) and installed it in my ZIF-modified 7747. Unfortunately, the results were the same--slightly rough idle and too much fuel during restarts. As Dave W indicated earlier, one of the symptoms of running in Limp Home Mode is too much fuel. Since I've tested several 28-pin chips in the ECM and, thereby, eliminated that the problems are with the EEPROMs, the remaining conclusion is I messed up my 7747 while installing the 28-pin ZIF socket.
Before I toss the ECM out, is there a sure-fire way of determining the ECM is indeed running in Limp Home Mode? Is there software available that will read this via the ALDL? If I removed the LHM chip and leave in only the AKDW, will a "no start" indicate that the ECM was indeed running in LHM?
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