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Old 04-27-2010, 08:15 PM   #1
Almost Sideways
Join Date: Nov 2007
Location: canada
Posts: 1,868
M52 OBD1 swap starting problems

during start up or ignition the fuel pump relay starts going crazy (switching on and off). The spark is also random. But after the third crank, the car starts up and the signals to the fuel pump and coils are perfect. The signal was checkedwith some diagnostic tools, so forshure thats whats happening, just dont know why.

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Old 04-27-2010, 09:50 PM   #2
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Bad fuel pump relay? What DME are you using?
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Old 04-28-2010, 10:51 AM   #3
Hard Dog
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Join Date: Jul 2006
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I am currently doing the same swap. Putting an M52 into an OBD1 325. I haven't progressed to the re-starting point yet; the old M50 isn't out yet. I will be swapping the silver label 413 DME for a red label 413 unit. This is supposed to eliminate the EWS issues. The instructions I have state there may still be ignition issues. In that case, you need to open up the wiring harness leading to the DME and cut wire #66. It is supposed to be a solid green or black/violet wire. That may be your problem.

Please let me know if you solve the problem. I may be picking your brain myself in a few weeks.

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