mjling 0 Report post Posted September 27, 2010 Hi, Can anyone tell me what the sensor is around the number 4 plug lead on my E30 M40 318i, is this essential as I need to replace the lead and wonder if I can use a standard lead. Thanks Marcus Quote Share this post Link to post Share on other sites
hotwire 352 Report post Posted September 27, 2010 It is cyl reference for the ECU & yes it does need it Quote Share this post Link to post Share on other sites
gmccormack 0 Report post Posted September 28, 2010 I thoughht the reference sensor was on the front pulley and the sensor on the plug lead went straight to the diagnostic plug on the engine. The sensor on mine was broken and seemed to have no effect the running of the engine. Quote Share this post Link to post Share on other sites
mjling 0 Report post Posted September 28, 2010 Thanks Guys, I have found that Repco sell the correct BMW boots to make up a plug lead so I will try it with and without and post my findings here later. Quote Share this post Link to post Share on other sites
