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Thread: S50 swap won't start

  1. #1
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    S50 swap won't start

    So I pulled my NV M50 out of my E36 and put a 95 S50 motor in. I replaced the motor, wiring harness and ECU (413) all from the donor car. Now the motor will crank but no fuel or ignition. I swapped the crank position sensor, tried another ECU rechecked all the grounds and no change. Any ideas? I reused the system relay (next to fuse box) but it looks the same from the Bentley diagrams but not 100% sure.

  2. #2
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    Quote Originally Posted by dallas02E39 View Post
    So I pulled my NV M50 out of my E36 and put a 95 S50 motor in. I replaced the motor, wiring harness and ECU (413) all from the donor car. Now the motor will crank but no fuel or ignition. I swapped the crank position sensor, tried another ECU rechecked all the grounds and no change. Any ideas? I reused the system relay (next to fuse box) but it looks the same from the Bentley diagrams but not 100% sure.
    Sounds like an EWS issue?

    - Mark

  3. #3
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    what ECU are you useing? red or silver 413

    E30 Turbo 2.8L - 60ft - 1.70 :: 1/8th - 6.99 :: MPH - 105.47 :: 1/4 - 10.66 :: MPH - 132.53
    Daily E36 M3 - 60ft - 1.790 :: 1/8th - 8.20 :: MPH - 84.68 :: 1/4 - 12.81 :: MPH - 107.05
    *RIP* E36 M3 - 60ft - 1.944 :: 1/8th - 8.64 :: MPH - 80.00 :: 1/4 - 13.55 :: MPH - 99.95
    Cool2seat's TTstg1 E36 M3 - 60ft - 2.123 :: 1/8th - 8.44 :: MPH - 87.71 :: 1/4 - 12.94 :: MPH - 107.95

  4. #4
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    The chip (photo below) in the ECU is marked D-EWS which I was told eliminated the EWS which is fine since this is a race car. Also from what I understand wouldn't that prevent it from even cranking?
    Attached Images Attached Images

  5. #5
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    Quote Originally Posted by rpm620 View Post
    what ECU are you useing? red or silver 413
    Silver that came from the car the engine was in.

  6. #6
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    Quote Originally Posted by dallas02E39 View Post
    The chip (photo below) in the ECU is marked D-EWS which I was told eliminated the EWS which is fine since this is a race car. Also from what I understand wouldn't that prevent it from even cranking?
    I believe it will crank but not start, but I could be wrong - it's been a long time since I've had to deal with it.

    - Mark

  7. #7
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    Did you cut DME pin 66 (7 on the X22 connector?). It does sound like the EWS.
    Check out the 8legs Racing page: https://www.facebook.com/8legsRacing/


  8. #8
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    Quote Originally Posted by ScotcH View Post
    Did you cut DME pin 66 (7 on the X22 connector?). It does sound like the EWS.
    +1 on that....DO IT Eliminates all second guessing.

  9. #9
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    Quote Originally Posted by ScotcH View Post
    Did you cut DME pin 66 (7 on the X22 connector?). It does sound like the EWS.
    So just to be sure...pin 66 is identified as Anti-theft in the Bentley diagram. Where would you cut it at exactly? The big connector to the DME is fairly well sealed. I am a little unsure of where/what the X22 connector is. I really appreciate the help.

    Cut pin 66...the silver rigid wires just inside the cover of the DME. The ones that connect the connector to the board. Still not working. Looked at the plug next to the fuse box and the slot for pin 7 appears to be empty???
    Last edited by dallas02E39; 01-01-2010 at 09:18 PM. Reason: Automerged Doublepost

  10. #10
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    Do you have a code reader? Can you communicate with the DME at all? maybe power/ground to the DME is messed up. When you try to start it, does your CEL come on, the go out after a few seconds?
    Check out the 8legs Racing page: https://www.facebook.com/8legsRacing/


  11. #11
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    It's showing 1281, DME memory issue. The typical fix is to reset and then let the car run for a while but that is not an option since I can't get it to start. I do have sufficient voltage...actullay have a second battery hooked up to the jump points under the hood.

  12. #12
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    I have an obd1 m52 in my car and get that error message constantly. It never seems to affect anything though..?

    Are you sure its an ignition issue and not fuel related?
    Last edited by thesnake; 01-03-2010 at 02:51 AM. Reason: spelling
    -Jake

  13. #13
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    If the CEL lights up, it is very likely not an EWS issue.

    Is the fuel pump running when the key is turned to 'start'?
    Chris
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  14. #14
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    Quote Originally Posted by fsmtnbiker View Post
    If the CEL lights up, it is very likely not an EWS issue.

    Is the fuel pump running when the key is turned to 'start'?
    The CEL does light up so that is good to hear that it is likely not EWS related. The fuel pump does not trigger when I turn on the key. I put a jumper across the two points on the fuel pump relay and it did turn on so the pumps do work just not getting turned on correctly.

  15. #15
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    Do you have RPM signal when you crank? (on your scan tool)

  16. #16
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    If the DME is not turning on the fuel pump, as far as I know, there are only 2 conditions that will prevent that: EWS and Crank sensor. Anything else it might not start, or run, at least the DME will turn on the pumps.
    Check out the 8legs Racing page: https://www.facebook.com/8legsRacing/


  17. #17
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    +1 on the EWS wiring...Past that; are you absolutely sure you have everything hooked up correctly? I had a very similar issue and it turned out to be a grounding strap. Should be 2 grounds, one near the OBD port and one down by the passenger side engine mount.

  18. #18
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    Yes, I have gone back over all the connections...very frustrating. I am trying to get ahold of a friends 95 and try another DME. I did swap in another crank sensor but no change. I am still unsure of the 1281 error. Can't seem to get it to clear but at this point it may be the fault. From what I have read it could point back to the aftermarket chip in the DME but unfortuantley I don't have the stop chip to swap in. Gonna look back over everything. Do you know if the System relay (by the fuse box) is different from 1992 to the 1995 model? From what I have read and looking at the Bentley diagrams it appears to be the same but I am trying anything and that is a part I reused from the M50 set up. I appreciate all the help on this and when I get this figured out I'll follow up for sure. Keep those ideas comming.

  19. #19
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    If you have the fuel pump jumpered to run, does the car start?

    If the fuel pump relay is not getting energized, there's a pretty short diagnostic path to follow for that. Given that you're getting the memory fault, I would double-check the chip or swap to a different, known good, non-ews ECU and try again. Are you sure the chip isn't rotated 180 degrees? Or, the better question is, did this ECU/Engine combo run in a different car before you got it?
    Chris
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    12 Jeep SRT8

  20. #20
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    The car would not start with the fuel pump jumpered so I can only assume ignition is not getting energized.
    I bought the entire package from a local BMW shop who removed it from the donor car and assured that it ran. Appearently he had mainted this car since early in it's life but was in some sort of accident that ripped out much of the suspension and was totaled.

    In my post #3, I think, there is a picture of the chip in the DME and the notch is at the correct end. It has a small board that is between the chip and the main board. Is that normal...I've never seen that before?

    I think I'm stuck until I try another chip or entire ECU. That just seems to be where everthing comes back to.

  21. #21
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    Quote Originally Posted by dallas02E39 View Post
    The car would not start with the fuel pump jumpered so I can only assume ignition is not getting energized.
    I bought the entire package from a local BMW shop who removed it from the donor car and assured that it ran. Appearently he had mainted this car since early in it's life but was in some sort of accident that ripped out much of the suspension and was totaled.

    In my post #3, I think, there is a picture of the chip in the DME and the notch is at the correct end. It has a small board that is between the chip and the main board. Is that normal...I've never seen that before?

    I think I'm stuck until I try another chip or entire ECU. That just seems to be where everthing comes back to.
    The small board that the chip sits on is the copy protection for the software ... most aftermarket chips have it, stock do not.

    I donno ... I still think it's the EWS ... to be sure I would try a red label 413 or a 506 with a stock 95 chip.
    Check out the 8legs Racing page: https://www.facebook.com/8legsRacing/


  22. #22
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    I agree, at this point it seems like an EWS issue. If the ECU isn't energizing the fuel pump relay, just about the only thing that can stop that is the EWS signal or a faulty ECU.
    Chris
    97 M3
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    12 Jeep SRT8

  23. #23
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    I'm gonna try to track down another ECU. Kinda curious about the red label versus the silver. The red label is non-EWS?

  24. #24
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    Correct -
    Red label 413 = Non-EWS Vanos 6-cyl E36
    Silver 413 = EWS Vanos 6-cyl
    Silver 506 = EWS Vanos 6-cyl
    Chris
    97 M3
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    12 Jeep SRT8

  25. #25
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    Quote Originally Posted by fsmtnbiker View Post
    Correct -
    Red label 413 = Non-EWS Vanos 6-cyl E36
    Silver 413 = EWS Vanos 6-cyl
    Silver 506 = EWS Vanos 6-cyl
    506 is non-EWS for 95 M3. Identical to 413 red label.
    Check out the 8legs Racing page: https://www.facebook.com/8legsRacing/


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