There's a guy that has been doing TBI conversions on off roaders for years and putting the 1227747 ECM under hood. The only time anyone has had issues is when ECM was completely wet. They all get splashed, he's been putting a rubber flap over them to keep splash off. Just no room under dash in Jeeps or Toyota Land Crusiers for an ECM.
But for a MC the size alone of a GM ECM is hard to deal with.
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