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Thread: Ignition wires for M70 and M73 engine

  1. #1
    Join Date
    Jan 2005
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    Japan
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    11/88 E32 750iL+98 E36M3

    Ignition wires for M70 and M73 engine

    My latest addition. Made on special order and available now. Presently have them in black and a limited number in blue colour available. No cheap cable 'rubber' and plug 'rubber', they are made of silicon material. So much softer than the OEM ones.
    Why should you replace your original wires? Here is a few reasons: new spark plug wires provide better conductivity and more spark. Better conductivity and more spark means improved throttle response. Good plug wires are absolutely essential for reliable ignition performance and trouble-free operation. A bad spark plug plug wire may create so much resistance that the voltage never reaches the plug, or a break in the insulation may allow the spark to arc to ground. Either way, a bad plug wire will cause a spark plug to misfire. Bad spark plug plug wires can cause hard starting (particularly during wet weather), poor fuel economy, rough idle, hesitation when accelerating and increased hydrocarbon (HC) emissions. Spark plug wires should always be inspected if any of these symptoms are present, and when the spark plugs are changed. If wires show any obvious damage such as burned or cracked insulation, chaffing, loose plug boots or terminals, the wires should be replaced. Also, if visible arcing is present new wires are needed. Wires should also be replaced if their resistance measured end to end with an ohmmeter exceeds OEM specifications.

    M30/M70 ignition system data accdg to Bentley
    Coil primary, coil code # 2051118335 terminals 1 (-) and 15 (+) resistance 0.50 ohm
    Coil primary, coil code # 20510171101 terminals 1 (-) and 15 (+) resistance 0.37 ohm
    Coil secondary, coil code # 2051118335 terminals 15 (+) and 4 (ctr. resistance 6.0 kohm
    Coil secondary, coil code # 20510171101 terminals 15 (+) and 4 (ctr. resistance 9.0 kohm
    spark plug ends 5.0+/- 10% kohm
    shielded plugs 1.0 +/- 20% kohm
    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.

    Here the blue ones http://tinypic.com/usermedia.php?uo=...EeToh4l5k2TGxc
    Without the 2 donuts/speed sensors (can be used from the old set or separate buy/supply new ones) and without the funnel/bracket (use the old funnel/bracket installed in the car). No marten repeller included too.
    To add the donuts, see here the instructions http://tinypic.com/usermedia.php?uo=...c#.V7Gpu-8kqUk

    Update 2017-05-05
    All blue ignition wires sold.
    Black ones on stock. Price per set of black ignition wires consisting of 12 ignition wires between distributors and spark plugs + 2 wires between ignition coils and distributors = total 14 wires US$ 190 shipped by airparcel from Japan. Paypal o.k. Please contact me by PM with shipping address. Make sure your old plastic ignition wire tubes are not brittle.
    Attached Images Attached Images
    Last edited by shogun; 07-24-2017 at 09:02 PM. Reason: updated
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  2. #2
    Join Date
    Mar 2010
    Location
    raleigh nc
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    53
    My Cars
    1991 e32 750il
    Thanks for all your help shogun! I wasn't sure when the wires got here how they came apart. He went out of his way to send me some pictures of everything taken apart! Great set of wires, Great customer service, Excellent guy!!!!!!!!!!!!!!!!!!!!!!!
    Everyone needs a set of these for there 750!

    Thanks,

    Ryan
    Last edited by shogun; 09-20-2014 at 07:17 PM. Reason: merged posts

  3. #3
    Join Date
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    Japan
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    11/88 E32 750iL+98 E36M3
    just to make it easier what woodscrew means I cut off a new wire and plug which is normally installed between ignition coil and the distributor, here the pics for better understanding
    http://tinypic.com/usermedia.php?uo=...8x9oh4l5k2TGxc
    http://tinypic.com/usermedia.php?uo=...dV8oh4l5k2TGxc
    http://tinypic.com/usermedia.php?uo=...EygYh4l5k2TGxc
    http://tinypic.com/usermedia.php?uo=...EiHoh4l5k2TGxc
    http://tinypic.com/usermedia.php?uo=...2BaYh4l5k2TGxc
    http://tinypic.com/usermedia.php?uo=...%2Foh4l5k2TGxc

    and this is OEM Beru to compare
    http://tinypic.com/usermedia.php?uo=...VKa4h4l5k2TGxc
    http://tinypic.com/usermedia.php?uo=...eTQoh4l5k2TGxc

    by set I mean for all 12 cylinders the ignition wires. Not only for one side as they are sold usually, that means for cylinder row 1-6 and another set for 7-12.

    @whiteghost1: 1 black set M70 ignition wires plus the OHV valve spring compressor are on their way to the west coast.
    @Marc: 1 ignition wire set V12 for your E32 750iL was sent out today to Fernie, BC, Canada

    info for Wizard,
    this is the procedure how to replace the old donuts, that means from old ignition wires transfer them to my new ignition wires with woodscrew connections http://produkte.bilder-speicher.de/0...-donut-on.html
    blue set looks like this http://tinypic.com/usermedia.php?uo=...EeToh4l5k2TGxc http://www.bimmerboard.com/forums/posts/767718

    cable - double layer of silicon with braid conductor
    single copper wires 1mm
    tin plating silicon terminals with suppressor resistor (used boots and terminals are identical to the original)
    may be applied to vehicles equipped with LPG installation
    will fit on the BMW tube
    outer diameter of the black cable version is (roughly) 6.90 mm =0.271 in
    outer diameter of the blue wires (roughly) 7.06 mm =0.278 in

    @Mike: 1 set ignition wires for M70 for your E32 750 plus a Hella voltage regulator 14.1V, for 28 mm slipring, for Bosch alternators. Part Cross-reference for OEM part 12311735742 (VOLTAGE REGULATOR) was found on the following vehicles: E31 850Ci, 850CSi,E32 750iL, E32 735i, E32 730i/iL M30,E34 535i M30 were just sent out to San Jose, CA.
    @trolav: 1 set M70 ignition wires in black will be sent to ┼krehamn in Norway.
    @clockwork: 1 black M70 ignition wire set for your 1991 E31 850i wire set sent to Calgary, Canada
    @Chillax: 1 black M70 ignition wire set for your 1993 E31 850Ci send to Tampa, FL

    I also have single cables with boots available, as I decided to sell one set part by part to help out some people here which just need one wire with boots. That are (at the moment, subject to prior sale) all wires with boots from cylinder 1 to 12, plus the wires with boots between ignition coils and distributor caps center. In case you need a single one, tell me by PM the number of the cylinder and also the length of the wire including the boots in Centimeters to avoid misunderstandings. Just for info the approx. length by cable/cylinder taken from internet info http://s71.photobucket.com/user/shog...l?sort=6&o=676
    Last edited by shogun; 05-04-2017 at 10:06 PM. Reason: cleaned up
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  4. #4
    Join Date
    Jan 2009
    Location
    Norway
    Posts
    5
    My Cars
    2010 Opel Zafira 1.9CDTi
    Thanks Shogun!

    The original ignition wires are now 24 years old and very ready for replacement.
    I'll probably order more of your goodies later. Just have to get the beast running again first.


    Quote Originally Posted by shogun View Post
    @trolav
    1 set M70 ignition wires in black will be sent to ┼krehamn in Norway. Thanks
    Still have more black sets and 2 blue sets on stock.

  5. #5
    Join Date
    Feb 2005
    Location
    Calgary, Canada
    Posts
    904
    My Cars
    '91 E31 850i,'05 E53 4.4
    Thanks Shogun
    I swear, my cars are like a girlfriend.
    Sometimes its a rough ride, sometimes its smooth motorin'.
    Sometimes she doesnt like how i treat her and sometimes i dont like how she behaves.
    BUT at the end of the day, she loves it when I am inside her.

  6. #6
    Join Date
    Aug 2012
    Location
    Orange Park FL
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    92 750iL 88 M6
    Thank you Shogun!! A set of new pretty blue plug wires just showed up =). So got new wires, new CI sensors and new plugs, just waiting on the new distributor caps and rotors to be delivered.
    Last edited by shogun; 10-17-2015 at 08:50 PM.
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  7. #7
    Join Date
    Feb 2005
    Location
    Calgary, Canada
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    '91 E31 850i,'05 E53 4.4
    Hi all. Has anyone measured the resistance for their wires AFTER they have installed the CID sensors?
    These are the values I got if you'd like to compare

    Side one:
    1) 5.62ohm (shortest wire)
    2) 5.82ohm
    3) 5.95ohm
    4) 5.97ohm
    5) 6.13ohm
    6) 5.78ohm (longest wire)
    Ignition wire) 2.05ohm

    Side two:
    1) 6.13ohm (shortest wire)
    2) 5.82ohm
    3) 5.73ohm
    4) 5.75ohm
    5) 6.10ohm
    6) 5.91ohm (longest wire)
    Ignition wire) 2.04ohm

    Do you know if these numbers prove good connectivity between ends?
    I was more curious about the 6.13ohm on the #1 wire on set two. I was playing with removing the wires from their wood screw connectors and heard a bunch of "crunching" as I kept twisting wires. I am worried I may have broke many wires inside the silicone sheath.
    I swear, my cars are like a girlfriend.
    Sometimes its a rough ride, sometimes its smooth motorin'.
    Sometimes she doesnt like how i treat her and sometimes i dont like how she behaves.
    BUT at the end of the day, she loves it when I am inside her.

  8. #8
    Join Date
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    Japan
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    11/88 E32 750iL+98 E36M3
    Bentley manual mentions as reference: spark plug ends 5.0 +/- 10% kOhm, shielded plugs 1.0 +/- 20% kOhm, spark plug wires 0 Ohm approx. , so based on this all is o.k. within tolerances.
    The angled boots between the ignition coil and distributor center are each 1 kOhm, so 2 kOhm in total.

    DV8OR also just installed the wires in blue, maybe he also has measured them?

    Importance of functioning donuts, cyl. identification sensors M70
    I just read in the German forum about a case where someone changed on his M70 distributors, rotors, spark plugs and ignition wires on cyl. 6 and 12 and used the re-old donuts. Then he had trouble. Engine starts, runs short time with increased RPM and then dies. EML lamp goes on with ignition on and then goes out again as it should be. Diagnosis faults: fault ignition cylinder 1-6 and 7-12. That was 2 weeks ago. Today he fixed it. He noticed that he installed the cylinder identification sensors/donuts/pulse generators on ignition wires cyl. 6 and 12 the wrong way. Turned the donuts the correct way and engine runs starts and smooth.
    Apparently there no direction marks on the original ones, if I remember correct.pics from ECS website, original
    https://www.ecstuning.com/b-genuine-...e/12121725020/

    Aftermarket pics based on this website info
    Facet 9.0103
    https://boodmo.com/catalog/part-sens...ssion-2453507/ ERA 550277
    https://boodmo.com/catalog/part-rpm_...ement-2847082/ MEAT & DORIA 87418
    https://boodmo.com/catalog/part-rpm_...ement-2886417/
    no pics available from SIDAT 83357 + Hoffer 7517418

    This is not the first time that I read that when donuts are not working properly or the ignition wires/plugs # 6 and 12 are not functiong, there will be engine problems.
    So if the M70 starts, idles for some seconds, then dies, also check the ignition wires, plugs and donuts from cylinder 6 and 12. The usual cause of running for a few seconds and then stopping is the lack of cylinder identification signals. These are provided by the inductive sensors on HT leads 6 and 12. When you get a fault with INPA ti-signal, this is the injection time signal, the base timing is derived from the cylinder identification signal. We had the same problem some years back on an 850: lack of cylinder identification signals. In our case the ignition wire boot of cylinder 12 was lose/not connected to the spark plug. Before we checked the usually subjects like fuel pumps, fuel pressure, ignition = distributors + rotors, crankshaft position sensors.

    The car is telling you what is wrong, the CID sensors...
    Make sure you have them plugged into the right plugs?
    Make sure they are actually any good? Bad "donuts" have been a common problem with some replacements...(aftermarket).

    Another comment: Friend had same sort of problem a while back, motor would start and then died shortly thereafter. He'd brought it used from out of state. I had a suspicion after listening to the motor start and die a few times that not all cylinders were firing. I took a look and found they were from a 3 series! Popped in a spare set from an M70 and the car fired up and purred like a kitten. Turns out original owner sold car because it kept shutting off.

    So important is, when you change ignition wires and re-use the old donuts, make sure the donuts are installed the same way as original, not flipped. Basically it is not possible to installed them the wrong way, because the donut inner ring is conical and not round, so it should go onto the wire only one way. but some apparently squeeze it on the wrong way.
    Last edited by shogun; 07-24-2017 at 08:40 PM.
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  9. #9
    Join Date
    Aug 2012
    Location
    Orange Park FL
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    92 750iL 88 M6

    Shogun's Plug Wire Install Write Up

    Installing Shogun's plug wires.

    I did not take pics, sorry. I am the impatient type and taking pics takes too long plus I don't wear gloves so I would have to wash my hand every time to pick up my camera. So hopefully my write up will be good enough to understand and if you have questions please let me know.

    This will be in a semi bullet/step style write up with notes, I will not bore you will some hurdle details I needed to overcome just the fixes/work arounds.

    First off these wires are excellent quality!

    The "wood" screw type connector is traditional type i.e. if you are looking at the top of the screw it is clockwise on counter clockwise off. Righty tighty lefty loosey.

    I laid out all wires to get the groupings done and label all the wires with 1-12 by the distributor boot.

    I Installed the CI sensor on 6 and 12 wires. 1st hurdle, I could NOT unscrew the plug ends because the rubber boot was so tight and I could not verify removal unscrew direction at this point. I just pulled the boot off with force hoping it would not damage anything else. Once that was done and the plug end was cleaned of any remaining wire in the screw portion I was able to verify righty tighty lefty loosey. Installed CI Sensors. 2nd hurdle could not screw the ends back on due the rubber boot being so tight. So I removed the actual plug by prying it out. Once out I slid the boot over the wire and down a few inches then screwed the ends on and slid the boot over the ends. Be careful push/pull only on the plug itself (NOT THE WIRE) when doing this so you don't pull the wire out of the plug again. I used some dielectric grease to help.

    Installed the wires into the guides, this took some playing around to get the wires to lay nicely.

    Installed wires and guides into car, unplugged at this point.

    ** These wires do not self align to the spark plugs or the distributor cap plugs like the OEM wires/boots, more on this at end of write up**

    Started to plug wires on to plugs. 3rd hurdle, I could not get the boots to plug onto the spark plugs, see note above. This took a while but the fix was to wiggle the plug boot around till it lined up on the spark plug and push hard. Once I realized this it was not a big deal.

    Started to plug wires to distributor. 4th hurdle, once again you have to wiggle the boots around to get them to plug in.

    Plugged CI sensors in

    After install was done just a quick double to make sure I had correct order on distributor cap I started it up.

    **So more on the wire plugs. I cannot say for the spark plug side of the wire why it did not self align but the distributor side I can say it is because the portion of the plug that goes into the distributor is thinner then the OEM plugs so they will not self align. I am assuming that it is a similar issue with the spark plug side being that the boot is a bit too wide to align on spark plug. Either way you HAVE to wiggle the boot around till it seats properly and then push, this took some time the first go around. If/when I have to do it again it will be much faster.**

    Install time: 3hours, once again it would have been about 1-2 hours if I had the forehand knowledge of the screw direction and the alignment.
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  10. #10
    Join Date
    Feb 2005
    Location
    Calgary, Canada
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    '91 E31 850i,'05 E53 4.4
    I too have just done this task and agree with Dv8or. kind of a hard task to do, but very doable with patience and grease grease grease to lube the boot up to slide off and on again.
    I put them in my car tonight and I swear it seems like a new engine. So glad I bought the new wires and new cyl ID sensors (from BMW).
    thanks again Shogun.
    And just to let people know, I tried the aftermarket cyl id sensors sold by worldpac and they do not work. Have to use BMW brand cylinder id sensors (aka pulse generators). So yes I was "lucky" and got to do the job of removing/adding the boots twice.
    Last edited by clockwork; 10-02-2014 at 01:28 AM.
    I swear, my cars are like a girlfriend.
    Sometimes its a rough ride, sometimes its smooth motorin'.
    Sometimes she doesnt like how i treat her and sometimes i dont like how she behaves.
    BUT at the end of the day, she loves it when I am inside her.

  11. #11
    Join Date
    Jan 2005
    Location
    Japan
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    My Cars
    11/88 E32 750iL+98 E36M3
    My igntion wires come without ID sensors. Please buy locally your ID sensors and put then on, I suggest in this case you buy genuine/original from BMW or online vendors. Genuine! Pulse generator 2 pieces # 12121725020, original BMW, not aftermarket. Part 12121725020 (Pulse generator) was found on the following vehicles: E31 850Ci + 850CSi, E32 750.Cylinder Identification Sensor (donuts) 12121725020, 12121725023.The second is NLA and replaced by 020 according to RealOEM.

    Also NEVER pull on the ignition wires when you want to remove the boots from the spark plugs. There are special boot removal tools, or use your hand and wiggle/twist on the boot and pull. If you pull on the wire, the connection could be damaged between wire/boot.

    Fits on BMW: E32 750 M70, E38 M73, E31 M70, M73
    I also have some extra, new Ignition Coil Wires which attach between coil and distributor cap, BMW p/n for comparison 12121725038. My ones consisting of silicone cable copper core, 2 boots angled, each 1 K Ohm. Contact me in case of need with zip for shipping cost calculation, can sell single or as pair, whatever is needed. Limited qty available. Same applies for the ignition wires, can deliver single wires for each cylinder #, need to know the length you want. Approx. length of all: between ignition coil + distributor 54 cm/21.3", 44cm/17,3", 51cm/20", 60cm/23,6", 70cm/27,5", 77cm/30", 85cm/33" .Specify which length in Zentimeter you need. Then I will check and tell you if I have. If not, I suggest to deliver next longer size.

    Got new sets in black on stock. $190 shipped by economy airparcel.
    Attached Images Attached Images
    Last edited by shogun; 09-16-2017 at 06:14 AM.
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  12. #12
    Join Date
    Sep 2015
    Location
    UK
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    1988 BMW 750i
    Quote Originally Posted by shogun View Post
    @Triggsy
    1 ignition wire set for M70 will be shipped to U.K. this week.
    Arrived safe and sound this week. Thanks Shogun.

  13. #13
    Join Date
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    11/88 E32 750iL+98 E36M3
    @Andrew K: 1 M70 set shipped to Alamo, CA
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  14. #14
    Join Date
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    11/88 E32 750iL+98 E36M3
    @SteveCT: 1 ignition wire set for your ‘93 850Ci M70 shipped to Bedford, NH
    More sets available on stock.
    SHOGUN'S TRICKS AND TIPS FOR THE SEVEN SERIES
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