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  1. E36 ignition fault 
    #1
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    atec77's Car Details
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    Early 320I ibdone , recently the instruments failed and on the same day it lost two cylinders , determined the coils were at fault and just now installed a new set of 6 coils as a couple of coils were breaking down on test
    . I find number 4 cyclinder is still missing and on inspection with a scope it looks like there is no ignition pulse at the coil plug , I swapped the plug and coil to another pot and they work fine so can someone explain a trace procedure so I can determine why the pulse is missing . It may well be a wire fault in the harness in the cable box above the motor , any help appreciated thanks . Still waiting on the new instruments so can't do the stamp test atm

    B
     
     

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    TheEnd's Car Details
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    It might be an internal fault in the ECU from a transistor driver.
    I'm not sure if you have a Bosch or Siemens ECU, but if you open it up, down one on the short sides will be a row of transistors, usually with a metal clamp over the top as a heat sink.
    Have a look and see if one looks burnt or damaged.

    You could then swap the transistor, or swap the ECU.
     
     

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    #3
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    Well the car was fitted with Bosch coils and being a 91/92 probably will be Bosch , how do I get to the ecu ?
    I have not done this before and am learning (it seems) everything the hard way , in through the enginebay on the passenger side ?
    and many thanks for the reply , do you happen to know the type of driver transistor as thinking about what happened I suspect you might be right
     
     

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    It'll be tucked in behind the fuse box.
    I don't know the transistor type, there may be different types fitted to different cars.

    BMW E31 and E32 7-Series ECU Repair

    like that...
     
     

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    Quote Originally Posted by TheEnd View Post
    It'll be tucked in behind the fuse box.
    I don't know the transistor type, there may be different types fitted to different cars.

    BMW E31 and E32 7-Series ECU Repair

    like that...
    Many thanks , it's a transister fault for sure , will have to fire the pickup and run it down to the parts store 20 k away as I don't have anything suitable in the junk box (at 22 litres /100 kilometres ) still it's fun to drive .
     
     

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    Silly situation , $9.00 for a courier across town and $3.60 for 6 2N2791 trannies the equivelent of 30014 factory devices in the bosch ecu , it's easy to pick the bad device as the plastic copver under the clamp is a nice coffee brown , the current ecu is old and I wonder if anything else will fit it being a nmanual (0261 200 403)
    Thanks again
     
     

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    #7
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    It's one of a kind really, 6 cyl, non vanos.

    There are another couple of ECUs that should work in it, a 402 and maybe a 405.

    The M3 3.0 ecu is one of the closest in operation, but it won't give you are extra power just by plugging it in.
     
     

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    Quote Originally Posted by TheEnd View Post
    It's one of a kind really, 6 cyl, non vanos.

    There are another couple of ECUs that should work in it, a 402 and maybe a 405.

    The M3 3.0 ecu is one of the closest in operation, but it won't give you are extra power just by plugging it in.
    Well it aint my day , repaired the damaged darlington tranny it it wont work , no schematic so traced things for ages and it looks like some water got in and has caused the problem eating some tracks and shorting other drivers , time to fins an ecu
    Any suggestion (polite one I might have a 0261 200 402 available so I hope it works as this little car until now has been huge fun , incidently my electronic man used a Bu 323Z which replaced one of the others and works fine , however one pot still down
    Tnx
     
     

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    Well now running a 402 ecu , new coils and water pump instruments some other bits , revs very well to the limiter with a clean crisp bark and the cams I installed Saturday invite a decent lope , currently the idle is a little high at 1000 rpm but some driving should settle it down , thanks again and good as new , I have a spare 403 ecu just in case
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    You could try the vacuum lead thing on the carb is that connected?
     
     

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