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Thread: Knock Sensor #4
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Old 09-25-2007, 07:17 PM
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sc 540i sc 540i is offline
Location: CT
Join Date: Apr 2006
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Mein Auto: 540/6 Sport
Originally Posted by BMW_tech View Post
F.Y.I. knock sensors are basically microphones listening to your motor.If not properly torqued to specifications it may be over sensitive or send erroneous signals.I would check the connectors and follow it all the way to the DME.Simple continuity test from end to end eliminates the thought of any broken wires.Since you stated that they were replaced and still persists,the next step is to check your harness and the DME.I have seen cases where the thermostat (map cooling) connector craps out and can carry coolant that seeps through the wire insulation all the way to the DME drowning it with coolant.

Will def check that out coolant was everywhere, before I did the cooling system, and even after theres the smell of it. I'm guessing the process to check isn't very DIY ?
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