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Message: <blockquote data-quote="jarance" data-source="post: 626678" data-attributes="member: 21">Here is something I found on the internet.DME RelayMany people I have spoken to have had problems with the relay that controls the DME computer itself.  It's not uncommon for the main relay to have its contacts become corroded and fail to work 100% of the time.  Even if the relay is intermittent, it might show up as the engine running rough, or stalling, or any other number of failures.  One of the first steps I would take is to identify this relay (on E36 BMWs, it's relay number two, the white one, next to the fuel pump).  Try swapping it out with a known good one if you have one, or swap it with another one on the board (like the one for the fog lamps).  Try starting the car.  If you see an improvement, then you might have found the problem.  Start with the relay - it is the easiest and cheapest item to replace.Yes you can swap the ECU or the DME if the part number are the same. However, if the car cannot start after swapping, it could be due to the EWS not sync to the ECU. In that case, you may have to change the EWS and the chip in the key.Try changing the fuel filter first. It the cheapest and easiest thing to do.</blockquote>