I am currently tring to find out why my 530i will not fire and run. I have done alot of research on this and other forums, along with spending many hours in the Bentley and BMW manual, but am yet to get the car to run. Some background info... The engine was replaced, due to low compression and bad head gaskets. The previous owner's wife was tired of looking at it, so I took it on as a challenge. When I started looking into it I found that the alternator / battery wires were contacting the cooling tubes. Corrected the short at the alternator. I checked the 2 fuses to ensure they were still functional. Tried starting the car and found that the DME wasn't grounding out the fuel pump relay or the DME relay. So, the fuel pump wasn't being activated. I jumpered the grounds off of the relays and ensured the fuel pump was working and the DME was being powered. I also verified the coils were all firing. I also verified the engine had sufficient compression. I also checked to make sure the injectors were firing. I did find 1 injector that was stuck open and just dumping the gas into 1 of the cyylinders. Replaced the bad injector. I have checked the continuity of the wires coming off of the DME to ground and that is not the issue. I So, from what I can see I have gas, compression and spark. Yet the car still will not run. I have tried swapping the DME and it still does no ground out the relays to get the car to start. So, I have left the groundwires on the relays to makes surethe fuel pump and DME has power. I have checked the Crankshaft position sensor and Camshaft sensor, they are within tolerance limits. The car is equipped w/ OBDI, I have tried to do the stomp test, but it does not give any codes. I aslo had a friend bring his OBDI scanner over and it could not communicate w/ the DME. I would think that would point to needing the DME replaced, but since I have tried swapping it out w/o improvement, I don't think that is it. Being that I have a 80 633csi, 87 325e and a 90 735i, I can't test the DME in any of those vehicles to verify that one or either of them are good. But I wouldn't think that they both would have the exact same issue. That leads me to think that there is something else that I am just missing. I would like to get this car back on the road, since it's the best looking car in the driveway. I would also like to fix it the right way, without having to jumper relays to get the fuel pump to activate. Especially since the patch obviously didn't fix the problem. I have owned many bmws as old as a 69 2002 (71 02, 72 02, 74 02,75 02,76 02tii) and the above mentioned BMWs and still haven't found one that couldn't be fixed. I doubt this 530i is any different. Any help/assistance to this Bmw enthusiast, on a budget, would be appreciated. Thank you.