E31 1991 850i engine start up and stop in 2 sec

[norbee]

Hello Guys
Could you help me about my 1991 850i? I did some upper engine restoration. Car did run before, I replaced OEM parts like gaskets, plugs, plug wires, coolant hoses, water pump, injectors, etc. I did cleaned DK motors, looks fine (ohms). When I start the engine is firing up, but stop in 2 second. DK motors don't buzz, that is meaning didn't respond and engine didn't get any air and stop the engine. When is ignition on I did take out the DME relays and moved back, sometimes start buzzing DK motors sometimes not. When did buzz I started the engine and running on high RPM up and down. What I have looking for resolve this problem?
Thank you

[norbee]

Hello Guys
Could you help me about my 1991 850i? I did some upper engine restoration. Car did run before, I replaced OEM parts like gaskets, plugs, plug wires, coolant hoses, water pump, injectors, etc. I did cleaned DK motors, looks fine (ohms). When I start the engine is firing up, but stop in 2 second. DK motors don't buzz, that is meaning didn't respond and engine didn't get any air and stop the engine. When is ignition on I did take out the DME relays and moved back, sometimes start buzzing DK motors sometimes not. When did buzz I started the engine and running on high RPM up and down. What I have looking for resolve this problem?
Thank you

[rjjablo]

Check to make sure you #6 and #12 Sparkplug wire are on good and solid

Also check them for resistance, 6K Ohms

Also the prongs on the front of the doughnut sensor on # 6 and #12 face the distributors

[shogun]

DKs do not buzz and move?
Check once more both DK motors, as you disassembled and assembled them. Maybe the the 2 brushes are stuck or not correct installed http://www.mwrench.com/Whitepapers/DKMotorcleanup.pdf
http://bmwe32.masscom.net/moswald/75...ies/index.html
Are CPS and donut plugs correct installed? https://www.bimmerforums.com/forum/s...1#post30801851
M70 firing order: 1-7-5-11-3-9-6-12-2-8-4-10, crankshaft position/rpm sensor: 540+/- 10% ohm
from workshop manual: distributor rotor 1+/-20% kohm, angled/shielded connectors 1+/- 20% kohm, spark plug connectors 5+/- 20% kohm, cylinder identification sender coil resistance at 20 degree C (68F) <1 ohm, pulse sender/crankshaft position sensor coil resistance 540 +/- 10% ohm, Donut/ cylinder identification M70, S70: Resistance at 3-pin connector. Measure plug between pin 1 + 2, ≤1 ohm, insulation resistance between pin 2 + 3: ≥ 10 MOhm,

[dragon850]

You likely messed up your DK motors while cleaning them, or you have a bad EML computer

[Timm]

Did you use the correct plugs - I ask because 'starts and then stops after 2 seconds' is a sure sign of no Cylinder Identification Sensor signal: