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Thread: O2 Sensor Thermal Shock recall...M70 engines

  1. #1
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    O2 Sensor Thermal Shock recall...M70 engines

    O2 Sensor Termal Shock recall...M70 engines
    According to the internal service bulletins in the engine alert for M70 engines there's one called "O2 Sensor termal shock" named:SI 110896164 released by BMW AG in 01/1997.

    Symptom: Irregular idle and shaking when driving.
    Cause: stop and go driving and short distances will cause water residues on the cat,a cold start can cause the failure of the O2 sensors caused the termal shock
    Solution: O2 Sensor delayed heating with a relais...
    Parts:
    O2 Sensor 11781733628
    Delayed heating relais 11781745829
    Cables kit 12511745758

    Do you guys have any idea about this mod? that's a relatively new update by BMW
    old part number 12514384838. Price last year was around 45.00 EURO.

    12511745758 (wiring cable kit): part number does not exist in the normal parts catalog and has not been replaced. At least from what I can find in the parts catalog.
    However I assume that is a special assembled kit only for this SI, same like the check valve kit for the fuel pump, which is also only in the SI but not in the normal parts catalog.
    Last edited by shogun; 04-12-2020 at 11:59 PM.
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  2. #2
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    Very interesting Erich, I haven't heard anything about this before

    1989 BMW 750iL (prod 08/88) (vin: 2768675)
    Gone but not forgotten: 1994 BMW 740iL (prod 10/11/1993) (vin: *DE89667) 6spd swap, 2001 BMW 740i Sport

  3. #3
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    was just posted on BB E32 forum, I only copied it and added some comments from my checking of the parts numbers.

    For the MOTRONIC 1.7 they have a different system, also copied what I found:

    Cyl 6 & 12 no spark causing limp mode on DME 1.7
    Just read a post from RF E31 by a rather experienced forum member. He showed a service diagram for DME 1.7 indicating that:
    "If plug lead 6 or 12 (the ones with the inductive pickup donuts on them) are disconnected or short, a protection circuit embedded within the Motronic will severely clip the duty cycle of the injectors for that side to protect the catalysts from being drenched in raw, unburned fuel."

    Called the "Catalytic converter protection function", I wonder if my DME 1.2 may not have that function, thus I was able to pull off one or both Cam-Position-sensor plugs and the M70 can still be started. That may explain the contradicting observations. Anyone with Motronics 1.2 like to try an experiment (by pulling off a Cam-position sensor plug from front center of engine and see if engine can start?)

    Link removed August 1,2013, as no longer working, see new link in post #10

    plug lead 6 or 12 (the ones with the inductive pickup donuts on them) are disconnected or short, a protection circuit embedded within the Motronic will severely clip the duty cycle of the injectors for that side to protect the catalysts from being drenched in raw, unburned fuel.
    Last edited by shogun; 07-31-2013 at 11:46 PM. Reason: link removed, as no longer working
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  4. #4
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    if I pull the cam sensors mine still runs,if you pull the crank sensor,you get no spark,that side dont start.

  5. #5
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    same with my engine, because we have both the pre-facelift engine with the older MOTRONIK.
    I tested that after seeing the info on the 1.7 protection.
    But that does not refer to our older versions, the 1.7 get's much more info, therefore also more pins on the module.
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  6. #6
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    1991 750iL rough idle/great power lost

    hello i am new to the forum and this is my first seven series. I have been experiencing rough idling after roughly 30 minutes of driving followed by a severe lost of power even on flat land and deffinitely a hassle going uphill, plus the exhaust puts out some smoke so im assuming that im running rich the car also has a small odor of gasoline to it the transmission also shifts pretty rough through the gears also but when starting the car for the first time of the day it runs fine until the power lost and rough idle kick in then it barely drives almost lol, so i recently had the car checked out by a mobile bmw mechanic who has been working on them for 35 yrs and when he ran the codes the only thing that came up was the speed sensor, the 7-12 cylinder, and something saying o2 sensor control. He then told me that i need to replace the speed sensor and that my cats might be clogged, to check and see if the catalytic converters were clogged he told me to take out the o2 sensors to see if i get an instant rush of power and that if i do its the cats that are the problem if anyone has any other advice please im all ears i dont wanna get rid of the car.

  7. #7
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    first of all, read my write up
    rough idle - no power, second section is especially for the M70
    http://forums.bimmerforums.com/forum...+idle+no+power

    Smoke: is it black, blue or white?
    If it is oil smoke, then
    http://bmwe32.masscom.net/sean750/vc.../VCVvalves.htm
    http://www.ow.no/index.php?option=co...d=23&Itemid=13

    Speed sensor: do you mean cranlshaft position sensor?
    Check them both, must be 540 Ohm
    http://www.e32-schrauber.de/bmw/s-kw-sensor.htm

    do a cleaning of both throttling valves
    http://www.ow.no/index.php?option=co...d=23&Itemid=13
    test data are on my websie under reference values.
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  8. #8
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    thanx i will do that also the smoke is regular white and it looks like comes from the exhaust just in front of the catalytic converters. plus the cap and rotors, fuel filters,spark plugs,o2 sensors were all replaced within a yr before now and i had the cats tested and they were not clogged and a smoke test was done and there were no leaks in the engine block or anything and the car has a brand new battery and new air filters none of the hoses seemed to be cracked or dry rotted.
    Last edited by m70luxury; 07-11-2011 at 06:00 PM.

  9. #9
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    white smoke can be just condensation inside the large exhaust, unless you have coolant loss.
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  10. #10
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    catalytic converter protection
    Anyone found the SI?
    SI 110896164 released by BMW AG in 01/1997
    Last edited by shogun; 11-19-2022 at 08:42 AM.
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  11. #11
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    Motronic M1.7
    Catalytic converter protection function
    Ignition circuit monitoring

    The ignition circuit is monitored by the cylinder detection sender (pin 16) on ignition line 6 (or 12). If it detects no ignition signal on ignition line 6 (or 12) , the fuel supply to to the relevant cylinder bank is cut out by shortening the injection signal. The sender monitors the entire primary side of ignition, and cylinder 6 or 12 on the secondary side.
    See page 19 S70 engine manual https://web.archive.org/web/20140514...gineManual.pdf
    Last edited by shogun; 01-07-2024 at 08:29 PM.
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  12. #12
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    Here James mentions in post # 28
    Just an FYI it took me a year to fix an issue I had with my 7-12 bank dropping on me. It turned out to be the CI sensor, the reason it took so long was because the sensor did measure out correctly. I replaced it on a whim/last ditch attempt to fix my issue.
    And you can order them separately. I just ordered 2 new ones from BMW for about $27 each with my BMWCCA discount. Pulse generator 12121725020

    http://www.bimmerforums.com/forum/sh...t-SOLVED/page2
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  13. #13
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    Bosch Motronic M1.7 ignition and injection system for Alfa Romeo, 9.24 MB workshop manual http://www.tvc.se/AR/Workshop_Manual...n%20System.pdf
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  14. #14
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    Shogun, or anyone, is there a way to tell if this recall has been performed? I am finally replacing my O2 sensors (code 1222) and dont want to get damaged in some way.
    ______________________________
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  15. #15
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    Should be in the BMW system, if the recall has or not been done. Just visit the dealer and tell them the VIN and they can check online. I remember when I bought the Highline 10 years ago, I asked a friend then in a BMW dealership in the parts department in Germany, he even could check there that my Highline had 1 recall not done yet in Japan!, that was replacement of the old radiator cap against the new one. Radiator Cap Recall - No. 98V-178 http://twrite.org/shogunnew/data/servicebulletin.html
    He even found out that some years earlier at a BMW dealer a radiator hose was replaced. So all what has been done by BMW is in the system.
    Same happened to my US E36 M3 1998 built year. He told me there was a recall by BMW USA, so I went there to BMW in Japan, they never heard of that as that US version was never sold in Japan, so I showed them the printed out recall, they contacted Germany and I got all replaced free of charge and even the car was cleaned and washed
    Voluntary Emissions Recall Campaign No. 99E-A01 http://www.bimmerboard.com/forums/posts/1064118/
    also the side airbag recall they did free of charge: AIR BAGS:SIDE/WINDOW recall/defect on 1998 BMW M3 , Build Years/Makes/Models: 1997-99 M3 , Units affected: 16749 Recall Number: 99V063001, http://www.bimmerboard.com/forums/posts/1077229

    Easy to check for recalls, so for example your 1992 750 has this : Recalls for 1992 BMW 750 http://www.cars.com/recalls/bmw/750/1992/
    Recall Number: 98V178000 Recall Date: 08/04/1998 Component: ENGINE AND ENGINE COOLING:COOLING SYSTEM
    Recall Number: 96V110000 Recall Date: 07/01/1996 Component: AIR BAGS:FRONTAL Problem Summary: THE AIR BAG CONTACT RING LOCKING TAB LOCATED IN THE STEERING WHEEL ASSEMBLY CAN BREAK WITHOUT WARNING
    Recall Number: 96V111000 Recall Date: 07/01/1996 Component: SERVICE BRAKES, HYDRAULIC:SWITCHES:BRAKE LIGHT, Problem Summary: THE BRAKE LIGHT SWITCH CAN FAIL ALLOWING THE SWITCH TO REMAIN IN THE "BRAKE LIGHTS OFF" POSITION OR IN THE "BRAKE LIGHTS ON" POSITION.

    More difficult is to get info about voluntary recalls. If the owner or pre-owners did not have serviced the car at BMW and they have no contact address, they will of course not inform you then. So a visit to the local dealer and a nice chat with the repair department will tell you, they can easily check that with the VIN.
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  16. #16
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    Okay, I will call. I did check the online systems but any vehicle older than year 2000 was not in the system. You are right, I am sure, that the dealer themselves have greater access.
    ______________________________
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    EBA Installation of the auxiliary engine wiring harness for the BMW M70 engine https://bmweba.com/eba-01-29-9-782-108/
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  18. #18
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    850i random check engine blink power lost

    [QUOTE=shogun;30068919]EBA Installation of the auxiliary engine wiring harness for the BMW M70 engine https://bmweba.com/eba-01-29-9-782-108/


    Hello community -

    I have a 1991 850i and I am having one pending item. Every so often, the check engine light starts blinking and the car loses power. I drive it for a little while and the light goes off permanently. Doesn’t happen often, but still does and it can be a little concerning while its happening.

    It happens mostly when idling after a little drive in traffic or rainy days.

    Thoughts?

    PS. I read about the O2 sensor Thermocharge item but based on how much activity it shows in the chat, seems like it’s not a common issue (Shogun doesn’t have anything for it in his page!! Timm doesn’t have video on that!!!).

    Before I start messing up with all of that, I would appreciate guidance. Is that a common cause for issues?

  19. #19
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    Unfortunately most of the links do not work anymore. This cat converter protection function was only introduced for the Motronic M1.7, my M70 M1.2 does not have it and there were a lot of E32 750 produced in the early production years with 1.2 and I have not read about problems with that.
    Best is you read the fault codes, maybe you have a software system to read codes and go from these results.
    Or male a stomp test, should work on your E31 1991 850, All 1989-94 BMW vehicles are equipped with a self diagnostic system for the detection of injection faults.
    http://www.e38.org/e32/bmw%20code%20defaut.pdf
    Last edited by shogun; 01-20-2023 at 10:18 PM.
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