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Old 01-28-2013, 08:20 AM
ninetyseven1 ninetyseven1 is offline
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Location: Lewes
Join Date: Jun 2012
Posts: 83
Mein Auto: 1997 540i
Originally Posted by ninetyseven1 View Post
Unplug the MAF and drive it and see if you still hear knocks. Keep in mind though that when coming to a stop your car could stall out with a disconnected MAF sensor. Also, your traction control will not function.
Also, the knock sensor wiring corrodes. I unplugged one of mine from the black electrical box on the intake and looked inside the connector. There are four small wires inside the actual connector plug. I had 2 wires that were touching! The actual plastic insulation around the wires just plain corroded off! You will have to split the rubber boot on the connector plug with a razor blade to see inside it. Just tape it back up with electrical tape. It's worth a shot.
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