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Thread: Getting bored, two cylinders only work

  1. #1
    Join Date
    Mar 2019
    Location
    Egypt
    Posts
    1
    My Cars
    Bmw e21

    Getting bored, two cylinders only work

    Hello
    Well, i have m43b16 on bmw e21
    I have two problems
    1-some times when i turn of the engine i found that it still working as if two cylinders only and don find a solution.

    2-now adays the cooling fan start time delays more than normal 97degree
    I changed the radiator thermostat but for sorry there no change

    Kindly help me🙏

  2. #2
    Join Date
    Jan 2005
    Location
    Japan
    Posts
    54,654
    My Cars
    11/88 E32 750iL+98 E36M3
    moved to E21 forum
    I understand you installed the M43B16 from the E36 or E36 in the E21 , 1993-1999 E36 316i,1998-2001 E46 316i
    check the kohm of the ignition wires http://www.realoem.com/bmw/enUS/show...diagId=12_1983

    maybe the cooling problem is the fan clutch http://www.realoem.com/bmw/enUS/show...diagId=11_6016
    How to test the fan clutch: http://www.realoem.com/bmw/enUS/show...diagId=11_6016
    Last edited by shogun; 03-23-2019 at 12:07 AM.
    Shogun tricks and tips for the E32 series are HERE!

  3. #3
    Join Date
    Feb 2009
    Location
    District Nine
    Posts
    17,984
    My Cars
    sold 78 BMW 320i
    Are the valves adjustable on the m43b16?
    Maybe try a 'cold' compression test before making adjustments.

    @ shogun - I just noticed your mention of plug wires, regarding ohm resistance, great call. I had two 'resistor style' wires fail on me within two days (I know, strange). Those resistor style wires don't last forever!
    Last edited by epmedia; 03-25-2019 at 06:02 AM.
    Tbd

  4. #4
    Join Date
    Jan 2005
    Location
    Japan
    Posts
    54,654
    My Cars
    11/88 E32 750iL+98 E36M3
    In most cases the wires are still o.k., just the resistors die inside the spark plug side boots. Especially for us M70 V12 owners that is a costly replacement, but one can replace the boots with resistors only, here the procedure for the M70, should be same for others:
    changing the original spark plug boot, from a German E31 forum regarding M70/S70 ignition wires, seems in most cases the long boot going to the spark plug is the problem, the resistor inside the long boot get’s bad over the years, German text:
    Beim M70 werden Zuendkerzenhersteller 5000-OHM 12121710707 benoetigt. Ich moechte beim S70 Motor die Zundkerzenstecker wechseln. Ist es wirklich so aufwendig, wie es in der Original BMW Reparaturanleitung steht? Laut dieser braucht man hierzu mehrere Spezialwerkzeuge....Laut dem aktuellen BMW Ersatzteilkatalog finde ich folgende Teile, kann mir jemand sagen,ob das so vollstaendig ist + warum 3 Teile ausgewiesen sind:
    - Kerzenstecker/: Nr. 12121710707 , -Isolierhulse: Nr. 12121736142 ,- Rundstecker: Nr. 12121705656
    --------------
    Zuendkerzenstecker Bosch / Bremi mit 5KOhm Innenwiderstand. Im Laufe der Zeit zersetzt (oxidiert) der im Kerzenstecker enthaltene Metallfilmwiderstand sich und der Zuendstrom wird zu schwach. Das Wechseln der Kerzenstecker ist denkbar einfach, solange die Kupplungshuelse noch fest mit dem Kabel verbunden ist.
    - du schneidest das Gummi des Kerzensteckers am oberen Ende vorsichtig auf, damit die Keramik freiliegt.
    - mit einem kleinen Hammer nun den oberen Teil der Keramik zerschlagen, bis die silberne Kupplungshuelse freiliegt
    - Die Kupplungshuelse kann nun mit einem Dorn entriegelt und abgezogen werden.
    - Der Neue z.B. Bremi / Bosch Kerzenstecker wird nun am Kabeleinlass mit etwas Fett oder Vaseline geschmeidig gemacht.
    - Nun einen kleinen Schraubendreher am Kabel entlang in die Huelse einstecken und durch das Kabelloch des Kerzensteckers fuehren bis er hoerbar einrastet.
    Hierzu gibt es auch ein Spezialwerkzeug, eine Ahle welches das Zuendkabel umschliest und auf der Kupplungshuelse aufsetzt.

    TRANSLATION:
    The M70 requires spark plug boot 5000-OHM 12121710707. I would like to change the spark plug boot on the S70 engine. Is it really as difficult as it is described in the original BMW repair manual? According to this one needs several special tools ....
    Accdg to the current BMW spare parts catalog, I find the following parts, can someone tell me, if this is so complete + why 3 parts are shown:
    - spark plug boot: No. 12121710707
    - Isolierhulse: No. 12121736142
    - Round connector: No. 12121705656
    --------------
    Reply: You will need spark plug boots Bosch / Bremi with 5KOhm with internal resistance. Over time, the metal film resistor contained inside the plug connector decomposes (oxidizes) and the ignition current becomes too weak.
    Changing the plug connector is very easy, as long as the coupling sleeve is still firmly connected to the cable.
    - Carefully cut the rubber of the plug boot at the top so that the ceramic is exposed.
    - Smash the upper part of the ceramic with a small hammer until the silver coupling sleeve is exposed
    - The coupling sleeve can now be unlocked and removed with a mandrel.
    - The new e.g. Bremi / Bosch spark plug connector is now made flexible at the cable inlet with a little grease or Vaseline.
    - Now insert a small screwdriver along the cable into the socket and guide it through the cable hole of the plug boot until it clicks into place.
    There is also a special tool for this purpose, which wraps around the ignition cable and attaches it to the coupling sleeve.
    -----------------
    The defective spark plug boot is now replaced. I bought the BERU tool EFS7 (introductory probe), so that you get the cable incl. detent sleeve quite well into the plug. The engine is now running well again even at low speeds, unbelievable what effects a defective spark plug connector can have ... I have the grained on the tool handle a hollow line, so that the cable can run away better back ....

    pictures
    connector to distributor side http://s6.tinypic.com/n1os4l_th.jpg http://s6.tinypic.com/24qn7tx_th.jpg
    connector to spark plug side, the long one http://tinypic.com/usermedia.php?uo=...c#.W7wCtO8UmUk
    http://tinypic.com/usermedia.php?uo=...c#.W7wC_O8UmUk
    http://de.tinypic.com/m/k04vow/3

    The genuine spark plug boot however is quite expensive, for example BREMI 13226/5 = 12121710707 regular price $32.00/piece.
    Alternatively one can also get from me for the M70 and M73 14 ignition wires cpl., 12 for the cylinders and 2 between ignition coils and distributors. Details here https://www.bimmerforums.com/forum/s...and-M73-engine
    available in black and a limited qty in red. 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.
    Shogun tricks and tips for the E32 series are HERE!

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