problem with ms42 ecu

[Tomas]

Hi, I have problem. I bought engine swap m52b28tu from bmw e39 and I put it in bmw e36. Everything works, but now there is one problem(ecu ms42.0):
When I accelerate till redline, car stops at 5500rpm, but in neutral gear, engine reaches redline(6500rpm). And after that car engine works with little vibration. Maybe someone has viring diagrams for ms42.0 ecu, not ms41?

[jlevie]

I could be completely off-base here, but I seem to remember a similar problem on a street car that was caused by no speed signal reaching the DME.

[Tomas]

wich wires do i need to connect? i found some but its not working.
i found on ms42 wire 22(abs conntroll block - speed sensor) and connected on e36 wire14(speedometer signal (obc)). Nothing happened

[jlevie]

On an E39 the speed signal for the cluster and DME is generated by the ABS unit. I don't know what that signal looks like, though I imagine it is a 5v square wave. The speed signal produced by the speed sensor in the differential on an E30 may not be what the DME wants to see. If the lack of a valid speed signal is the problem the solution could be suitable electronics to produce an ABS like speed signal or finding someone that can flash the DME and remove the speed input dependancy.

Or toss the MS42 DME and use a MegaSquirt.

[Tomas]

maybe there are some ways to reset ecu?

[karl_b]

hi, did you solve this issue?

Cheers, Karl