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Old 04-17-2013, 02:25 PM
HTK12 HTK12 is offline
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Location: Finland
Join Date: Aug 2012
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Mein Auto: E39 540i
Originally Posted by 540 M-Sport View Post
Disconnect battery first. Then go through all the connections, disconnect, and reconnect, inspecting for corrosion. There have been pictures and reports of people getting water or coolant in there, and causing all sorts of problems. Anything looks bad, clean it up, the best you can with electrical contact cleaner and a nylon toothbrush...flush with more contact cleaner, then canned air.

AND, if there is water intrusion, figure out how it got in there, and how to prevent it in the future. I think sometimes the previous tech forgot to seal things up properly....
In M62tu you get coolant due to MAP cooled thermostat being bad. When the sealing in it gives out the coolant is forced by the cooling system pressure, via the wiring to on top of DME.
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