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Testing ECUs

1.6K views 2 replies 0 participants last post by  Mark Foley  
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#1 ·
My friend's 328 engine has

My friend's 328 engine has a popping that, thru extended diagnostics, appears that it might be caused by one of the electronic controllers. So one at a time I am going to test his Microplex and Jetronic ECUs in my car.
My question is is there a recommended method for disconnecting, switching, and reconnecting the ECUs. For instance should the battery be disconnected or should any other procedures be followed.