S50 shuts off.....

[blackhawkimpact]

Doesn't the road speed signal connect through the harness on late models e30s?

[328ijunkie]

Not to a 24v.

[blackhawkimpact]

I'm saying the late model e30s all had the signal at c101 pin 14 (blk/wht), that includes my 91 318is.
So the speed signal sensor should already be connected, no?

[nando]

yeah, it's pin 14 on both connectors.

[blackhawkimpact]

Ok thanks. Then why is this happening? Low fuel pressure? Also my speedo don't work

[nando]

speedo not working has nothing to do with the swap, but if the instrument cluster isn't getting a signal from the VSS sensor in the diff, the ECU won't get that signal either, so it could be in limp mode.

it's possible the wires at the diff are broken or even the sensor, so get that speedo working and maybe it will fix your othe problem.

[Adrian_Visser]

With the speedo not working as well it sounds like there's no signal from the diff.

Just for fun fill me in a little more on the road speed signal and your harness adapter, did you wire up pin 14 on the x20 side so that there is actually a signal getting to the DME?

Just because the late model cars have the signal there doesn't mean that the engine side of the harness is connected to it, you still have to wire up the adapter or x20 plug for it.

[blackhawkimpact]

No harness adapter. I just use the e30 and e36 ETM and that's how I did it. Everything works except for the speedo. It was working before the swap. Everything seems to work except for that problem that it won't rev past 3500 rpm, it chokes.

[nando]

you need to get the speedo working; the ECU gets it's signal from the instrument cluster, so if the speedo on the cluster isn't working, the ECU won't see it either.

[blackhawkimpact]

Oh ok. I don't know what to check Everything seems fine. Probably because it doesn't have a chip? I already ordered one.

[Adrian_Visser]

Check the diff sender and wiring like nando said. Did you have the cluster out of the car? A broken wire behind the cluster is also a possibility in that case.

[blackhawkimpact]

So, it doesn't have anything to do with not having a chip? (413 red label on s50 engine.)

Yea I check the wires in the back today. I'll look into the diff sender and wiring tomorrow, thanks.

[blackhawkimpact]

Found the problem. Thanks everyone.