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Thread: M70 EML DK throttle valves data, testing, info

  1. #1
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    M70 EML DK throttle valves data, testing, info

    I'm also on the market for a set of throttles for a 1989 e32 750il V12

  2. #2
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    E32 problem

    Hey they everybody,
    I'm new here, and new to this whole forum thing lol, im the owner of a 1989 750il V12, and I'm having some troubles, I think I've narrowed it down to faulty throttles, IV taken the car on a trailer to the local BMW shop but they failed even to get a connection to the computers in the car, car starts sometimes with no response from the accelerator pedal or starts and revs up to crazy revs. And other times won't start at all , IV taken the throttles off and fallowed all the steps to cleaning and checking them, eml light is on all the time, id appreciate any help or pointers in what else to try, IV Owed the car a few months and it was running fine, parked it one night and next morning it would not start, previous owner had the problem of only running on six and changed plugs, leads , distrutor , clocks, maf's, would really appreciate any info or other things I could try, or does anybody no where I can find or search for throttles,

    Not sure IV even posted in right section, I'm new to this forum posting and all 🤞🙊😋

  3. #3
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    I merged the 2 threads and moved the post in General 7 forum to E32 forum.
    As you are from Belgium, check on Ebay de, there are some , search for: bmw m70 drosselklappen.

    If it starts and revs up, check the ground cable right side engine to chassis.
    Have you tested both fuel pumps already?
    Is the EML light functioning properly? read this thread https://www.bimmerforums.com/forum/s...Ultimate-Guide
    Last edited by shogun; 12-23-2018 at 03:31 AM.
    Shogun tricks and tips for the E32 series are HERE!

  4. #4
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    For Shogun:

    Do m70 throttle valves have a part number or such to indicate what year they come from? I have a clean pair but forgot what year e32 I removed them from.
    ​"The US Olympics bobsled team has renamed their sled 'Biden' because nothing has taken America downhill faster"

    TheStigg (aka "gale")
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  5. #5
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    Does not matter which year, M70 throttles valves are all usable/interchangeable over the production years of E32 and E31 M70, latest p/n is 13541736856 , maker is Bosch. The ones for the M73 of the E38 750 are made by Siemens and different.
    M70: 13541736856 Throttle Housing Assy Eml, From: 03/01/1991 To: - Supersedes: 12721731966 05/22/1989 — 04/11/1991, Exchangeable retrospectively13541725815 02/14/1989 — 08/07/1989, Exchangeable retrospectively 13541713906 06/01/1987 — 10/27/1994, Part 13541736856 was found on the following vehicles: E32 11/1986 — 03/1994, E3107/1989 — 10/1996, Sticker says for example : Bosch 0 205 003 001 (058) , Made in Germany, 683 00 046 BMW 1 736 856

    same p/n for left and right bank.
    Last edited by shogun; 12-23-2018 at 10:40 AM.
    Shogun tricks and tips for the E32 series are HERE!

  6. #6
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    Quote Originally Posted by Wayneje View Post
    I'm also on the market for a set of throttles for a 1989 e32 750il V12
    I have a pair of throttles for you that have been refurbished, if you’re not able find some in Europe, LMK.

  7. #7
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    Hey, thank you for the reply, where about are you located, and do you know that the throttles are in good working order, also how much cost?
    Shogun sorry for posting in wrong area, I'm very new to all of this forum stuff,
    Again thanks for the info also on check the ground... I will look at that tomorrow directly
    Regards Wayne ��

  8. #8
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    So finally I got my car back to my house to my garage, still not starting really and if it does only for a moment and then dies, checked power to injectors and that's fine, Iv noticed when I put the key in the on position with engine not started the right throttle is moving open and closed continuasly and the left not doing anything somtimes moves a little, I opened them and cleaned them last week, also with the key in the on position the with engine not started the eml light is on and not going off, is this normal, does it only switch off when the engine starts.? This week I'm going to check the fuel pumps and power, and run down the checklist problems posted here, also if I wanted to buy a code reader what should I look for that won't break the bank, any help much appreciated guys
    regards wayne

  9. #9
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    Shogun tricks and tips for the E32 series are HERE!

  10. #10
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    Shogun, when the key is in the on position with the engine not running the eml stays on, is this normal, also the last evening that the car drove I noticed while sitting in traffic the rev conter going up on its own without me pressing the pedal, I wil Check out tat wire you linked tomoro
    regards wayne

  11. #11
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    The EML light comes on briefly when you switch ignition on and then disappears when system is operational, says the owners manual http://www.e38.org/e32/E32_1992_Owne..._optimised.pdf
    if the lamp stays on or comes on again, there is a system malfunction
    Shogun tricks and tips for the E32 series are HERE!

  12. #12
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    Would it be worth while changing the clocks in the car, also if I was looking to by a diagnostic tool what should I look for,

  13. #13
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    Maybe you check with do-it-auto in Germany, as you are from Belgium https://doitauto.de/
    or someone here can give a link to a working tool for the 1989 E32
    Shogun tricks and tips for the E32 series are HERE!

  14. #14
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    Hi hi, so Iv done a few things with the car, I replaced cluster with another, and still same problem, eml light stays on, it also tells me asc not active, the asc light flashes on and off fast when the car starts and then nothing, no response from accelerator when pressed, one throttle stills opens and closes fast and won't stop, I replaced ground cable at front of car because old one was bare wire,
    the car back fires and bangs when idleing
    i noticed some damage around the catalytic converter also, would this cause a problem?
    also I was thinking about crack sensors.?
    if the head gaskets was gone would it cause said problem? As I see some mayonnaise in the oil cap ����

    Next I will replace the fuel pumps and filters, just haven't had the funds to purchaseyet as we have our first baby on the way and just got married so she cut my car budget back ������

    im not very mechanically minded and trying all this myself lol, so all help is great and really appreciated
    Regards wayne ✊️✊️��

  15. #15
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    some mayonaise in the oil cap is normal when the car has not been driven long distances and did not come to operating temperatures, that will probably disappear when you drive a longer distance.
    Try to find a shop in Belgium which has a diagnostic tool for the older BMWs. Or you check in a Belgium BMW forum if someone nearby your place has such a tool and can help you.

    I am not 100% sure, but it could be that the EML automatically goes into limpmode when the ASC is not working, as the EML control module also uses these data. https://www.europeantransmissions.co...MW/EML-BMW.pdf

    you also have to check both crankshaft position sensors and the cylinder identification/donuts, because if they do not work, also limpmode comes
    https://www.bimmerforums.com/forum/s...hlight=CPS+M70
    https://www.bimmerforums.com/forum/s...hlight=CPS+M70
    Shogun tricks and tips for the E32 series are HERE!

  16. #16
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    Yes I am in the process of looking for somebody to come to my House with a diagnostic computer, proving a little hard, and taking to the bmw garage is difficult because the car is not driving and I have to rent a trailer every time to take it at 140euro each time, so today I decided to pull the plugs and leads, difficult misery is an understatement, hah, anyways got them all out, look pretty oily, and number 6 closest the firewall on passenger sidewas pretty awful looking, kinda corroded like watwr had sat around it or somthing, so I'm waiting on new ones now at the moment, so I was checking the leads and notice, number six on same side had something like duck tape wrapped and melted around the plug end, so I think il replace the lot, also notice the little plug at the distributor end that plugs into the front of the engine was a little broken at the part that joins around the lead, if you no what I mean ������ would these cause issues? Again thank you for your replys and tips shogun much appreciated.
    reagrds wayne

  17. #17
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    I assume you mean the cylinder identification sensors aka donuts on cylinder 6 and 12. you can measure the ignition wires and donuts
    spark plug ends 5.0+/- 10% kohm, shielded plugs 1.0 +/- 20% kohm = in total 6 kohm from end to end
    spark plug wires 0 ohm (approx.)
    rotor 1.1 +/- 10% kohm

    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
    temperature switch for e-box cooling E32 750: switch on at 44 +/- 3 degree C, switch off at 36 +/- 3 degree C.

    Some more info here https://www.bimmerforums.com/forum/s...and-M73-engine

    Or buy a a complete set of ignition wires for cylinders 1-6 and 7-12, including the brackets, including marten protection and the 2 donuts
    Last edited by shogun; 01-21-2019 at 04:06 PM.
    Shogun tricks and tips for the E32 series are HERE!

  18. #18
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    How do I go about buy a complete set for both banks it's those donuts please?

  19. #19
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    for example here left and right side, including brackets, donuts https://www.autohausaz.com/catalog/c...set?s=d&page=1

    KR-12121733225 Karlyn-Sti Spark Plug Wire Set RIGHT cylinder 1-6 $232.39
    12121733218 Karlyn-STI Spark Plug Wire Set; Left Cylinders 7-12; With Loom $232,39

    will cost you including shipping from USA probably > $500, plus import duty and tax. So in total with the high import duty and 21% VAT in Belgium probably EUR 600.
    Last edited by shogun; 01-22-2019 at 08:11 AM.
    Shogun tricks and tips for the E32 series are HERE!

  20. #20
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    Hmm. If that one DAK/Throttle is opening and closing repeatedly, the computer is looking for proper signal from that one. Maybe go through the cleaning and checking process? http://twrite.org/shogunnew/files/fo..._Refurbish.pdf There is a voltage reading information some where; you can use that chart to check circuits of DAK/throttles circuits. I'd definitely would take apart and clean the dak/throttle motors and check the brushes and voltage/continuity ohms. If the other doesn't move at all, I'd do it too. They both should move a little when they key is switched on then stop. They will/should put out a light buzzing noise while the key is on. If that other one never moves when you switch on the key, it also has an issue. They should also open when you step on the throttle. From the drivers seat, you can crane your head to see in the engine bay and watch the springs on the side of each DAK/throttle for movement. If they seem fine, the wiring or computer should be looked over/tested next. more info: http://twrite.org/shogunnew/fixes/in...on_of_DK_units Also note the soldering on the circuit board can need re-soldered.
    Last edited by Narly9999; 01-22-2019 at 08:30 AM.

  21. #21
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    under reference data>>>>control systems>>>>DK input details >>> small PDF file are all the details to test the thottle bodies http://twrite.org/shogunnew/topmenu.html
    In case you need a used EML control unit, I have some on stock.
    Last edited by shogun; 01-22-2019 at 08:55 AM.
    Shogun tricks and tips for the E32 series are HERE!

  22. #22
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    Quote Originally Posted by shogun View Post
    under reference data>>>>control systems>>>>DK input details >>> small PDF file are all the details to test the thottle bodies http://twrite.org/shogunnew/topmenu.html
    In case you need a used EML control unit, I have some on stock.

    Thanks, I was wanting to use that. 8-) I have a naughty DAK acting up. Going to put the smack down on it.

  23. #23
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    I just remember a case on the German 7 forum where there was this problem with EML, I translate the important parts:
    M70 with EML does not start. In the cluster the EML light comes on, out after 2 seconds and then comes on again. Both throttle valves have been changed and also they react with ignition on = this typical small movements. When I move the DKs by hand and keep them open, the engine starts, but automatically they do not open. Already checked all fuses, relays and the 2 fusible links. Tested with code reader and as fault comes DK cyl. 7-12. ABS/ASC lights are also on and do not go out. Motorstarter turns, both batteries are full plus a 1700W battery charger 100A are connected to the poles in engine bay, enough power. Motor does not start, but when I manually/by hand open even only one DK, motor starts, but it only runs as long as I keep the DK open by hand. CPS is not the problem as the engine starts when I keep the DK open by hand. EML unit has the sticker Bosch 0 205 000 015 . Also tested ignition wire looms, donuts, spark plugs, distributors, rotors of distributors
    -------------
    probably engine wire loom broken or the EML control unit is defective. Also check the plugs of the wire looms going into the DKs
    ------------
    EML control unit is #3 in the e-box http://produkte.bilder-speicher.de/1...l-modules.html
    EML control unit of Motronic M1.2 and M1.7 M70 are interchangeable. I have a spare EML unit I can send you for testing
    -----------------
    Installed the shipped EML control unit, the engine now runs again as it should be. Thanks to all for the help. Also the ABS/ASC lights are off now.
    The problem was a defective EML control unit.

    synchronizing throttle valves https://www.bimmerforums.com/forum/s...of-M70-engines
    Last edited by shogun; 01-25-2019 at 07:55 AM.
    Shogun tricks and tips for the E32 series are HERE!

  24. #24
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    I finished the dak on mine tonight. Turns out the cars battery was low. It had the effect of an eml light and limp mode. I read about effects of a low battery in the manual. Charged the battery and sure enough she ran ok after a good battery charge. Last time i cleaned the DAK, I did not clean the hole where the commutator fits down into where the brushes come out. I think electricity was passing through all the graphite buildup around the hole causing a electrical leak/bridge between brushes.

    Wayneje; So many parts on this car can be taken apart and cleaned and conditioned an put back into service. The DAKs/Throttles surely can be reworked unless they are beyond service. Even then, they could be restore able often by an electric motor rebuild kit or company. That's my opinion anyway. A good machine shop could also create parts for them.

    I'm really waiting to see the 3D printer parts, people create. A new age of auto-restoration is here!

  25. #25
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    The worst/dirtiest DK we diassembled was this one, and that even worked still sometimes, then came sometimes the EML light and engine went into limpmode, cleaned it, all fine again.
    https://photobucket.com/gallery/user...TI0Nw==/?ref=1
    this had stuck brushes https://photobucket.com/gallery/user...TI0Mw==/?ref=1
    In case you need a new plug, they are still available, at least last year when I ordered some for stock , DK plug M70 12521714053 , here pics
    https://photobucket.com/gallery/user...Tg2NDU=/?ref=1
    https://photobucket.com/gallery/user...Dk2MzM=/?ref=1

    EML control unit I shipped out to Belgium Jan 26, should arrive soon, unless it got stuck in customs processing.
    Shogun tricks and tips for the E32 series are HERE!

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