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Message: <blockquote data-quote="525iBoy" data-source="post: 71493" data-attributes="member: 1183">I'v never heard of an ECR (electronic controlled relay) and I have the Haynes manual.  Perhaps it's a local / or generic. for something else; but term ECR does'nt make sense as arelays are electrically controlled anyway bec: a relay is a essentially a higher amp switch turned off/on by a lower amp switch.  I suspect this ECR thingy is often refered to just as a "relay"Not sure on our BMW, but When a car is running, the fuel pump normally runs all the time with excess fuel being routed back.  But some cars may switch off the fuel pump electronically - hence ECR.  A fuel pump relay would hence be needed to switch on the higher wattage, fuel pump, when your lower wattage ignition key is on and it could be this that  ECR refers to.  I would suspect BMW is the same as all cars used relay for major high draw items, eg lights, ignition etc.  And yes a kaput relay may not work / work intermitent depending on when it is hot/cold/cold/humid/ dry/upset at you etc etc!!!   relays cost shoud'nt potong you!!  bec I paid about RM120 for an original  bosch relay on my Porsche and since BMW uses bosch price should be approx. the same.  BTW:  if car is not running smoothly it is almost better to check the normal maintenance items such as spark plugs (incl if they are the right ones & properly gapped), distributor cap & rotor, air & fuel filter, clean engine oil.   FIRST because more often than not these are the culprits!! RM400 for new spark plug wires sound reasonable, considering there are 7 of them<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" />Enjoy. :nyehehe:</blockquote>

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