Calling M30 DME experts..

[Denny]

Got a big crappy idle..and runs like shit basically kind of problem on my M30B35 swapped 1990 e30 vert.

long story short..
The donor car for the engine was a E34 1991 bmw 535i (EURO) 5-speed... BIG difference lies in 1 thing... (EML) the throttle is electronic so I converted it by buying a cable throttle body, wiring harness, ICV from a guy on R3v from his non EML E34 535i.

I used the same DME from the EML car cause its the same number for ALL 535i it seems.. " 0 261 200 179 " but now I am wondering if the Chip / DME contains code for EML to control the electronic throttlebody and thats why my idle is shit since its not controlling it..

anybody would know?? if there is a difference ..anybody have a spare 179 from non EML 535i I could buy, ??

any other ideals... maybe even an ebay chip and just switch the chips?

thanks for any help..really need this car running. Right now I got throttle body open and disconnect vacuum to FPR for it to run at all... but runs pig rich..

[arch4ngel]

No idea on chip differences but seems likely there would be some difference.
I have a spare 179 ECU for sale if you need it.
PM me for details.

[Red88]

I've tried lots of different 179 ECUs on my car and it never mattered what throttle sensor the donor car had. How did you wire your tps? There's like 7 wires in the auto trans tps, I cut the plug off and found three wires that matched the m20 tps plug, soldered them together and have never had a problem. Icv is clean? What vac hoses do you have connected?

[Denny]

I've tried lots of different 179 ECUs on my car and it never mattered what throttle sensor the donor car had. How did you wire your tps? There's like 7 wires in the auto trans tps, I cut the plug off and found three wires that matched the m20 tps plug, soldered them together and have never had a problem. Icv is clean? What vac hoses do you have connected?

The donor car was manual and with EML so when I converted to wire throttle body I bought the wiring too.... throttle body TPS looks just like the M20 one. ICV is very clean and I tried 3 spares.. Vac hoses are all connected except the FPR one because If I plug it in the car idle dies down.. maintains 1100 rpm with FPR vac unplugged.

I have another 179 coming from a friend so I can check if its the DME..

[wildstoats]

In what way is the idle crappy? Does it hunt all over the place? Only when the engine is hot or cold? Nearly stall out at part throttle / return to idle?