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Author Topic: Motronic 1.7, M70 vs. M42/M43  (Read 8950 times)

HeinrichG_V12

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Re: Motronic 1.7, M70 vs. M42/M43
« Reply #15 on: August 22, 2021, 02:12:55 PM »
Hello  :)

First of all, I will get a DME in the next few days, I have found one  :)

Then I have got some infos from NGK, regarding the 48042 ignition coils. It's only a little information, but it's better than nothing. So, I think I have to test the dwell timing, but it should not be a big thing, something between 1.8 and 2.5ms should be ok.

What should we do next?
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Heinrich

bmwman91

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Re: Motronic 1.7, M70 vs. M42/M43
« Reply #16 on: August 23, 2021, 02:56:32 PM »
It seems like the next step would be to get an oscilloscope capture of the signal from the cylinder identification sensor. From there, some decisions can be made about what type of sensor will be needed when the distributor is gone.
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HeinrichG_V12

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Re: Motronic 1.7, M70 vs. M42/M43
« Reply #17 on: August 23, 2021, 03:39:42 PM »
Sounds good!

As soon as I get home, I will measure the sensor with the oscilloscope. Since it is an inductive sensor, I think we can use a VR sensor from the M50 non-vanos. (M50 with vanos has a hall sensor). The M70 sensor is connected exactly like the sensor on the M42. So pins 16 and 44, pin 44 is grounded. I attached the schematic.
« Last Edit: August 23, 2021, 03:53:07 PM by HeinrichG_V12 »
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