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Thread: Limp Mode

  1. #26
    Join Date
    Jan 2005
    Location
    Japan
    Posts
    54,655
    My Cars
    11/88 E32 750iL+98 E36M3
    I have only pics from E32, not sure how it is on E31 cluster. E32 http://bmwe32.masscom.net/johan/eml_bulb/eml_bulb.html
    http://www.bimmerboard.com/members/s...akte1,oben.jpg
    http://www.bimmerboard.com/forums/posts/92132/
    someone with an E30 with M70 engine had the same problem = limpmode, as he did not use the E32 cluster with the EML light, on the German forum they solved the limpmode prob of missing EML control light by installing 2 bulbs, and it was mentioned: sie haben 80mA und beide sind Paralell geschaltet!

    Note: all this info is for E32 cluster, just for reference
    Shogun tricks and tips for the E32 series are HERE!

  2. #27
    Join Date
    Apr 2009
    Location
    Ridley Park, PA
    Posts
    198
    My Cars
    91 850i x2, 92 850i 6sp
    Well my car just went limp Yesterday, scanner told me o2 sensors, luckily I had a spare brand new in the box (came as an extra 3 e31’s ago) and boom it’s gone! Wish they were all that easy.

  3. #28
    Join Date
    Oct 2016
    Location
    Shoreview MN
    Posts
    977
    My Cars
    Had a 1991 BMW 850

    Lights

    Put Two Bulbs in for the Check Engine Light and my turn signal and behind the odometer and a couple other that were marked but had no bulb.

    Did not change anything other than all my lights work

    Check Engine Light will come on with the key turned to run but will not turn off until I start it. Then it will go away under heavy throttle but come back as soon as I lift off.

    I am going to get my laptop sorted this weekend and look at codes

  4. #29
    Join Date
    Jun 2010
    Location
    Mission Viejo, CA
    Posts
    65
    My Cars
    94 850 CSi, 89 635CSi
    Have you considered plugged cats? Try removing the upstream O2 Sensors to see if it idles better. I chased all manner of issues with misfires reported on different cylinders on an 840 that barely ran until I let it "exhale" through the O2 holes. New cats and runs perfect now. Several injectors were bad. On any car, running too rich will overheat and destroy cat guts.

  5. #30
    Join Date
    Oct 2016
    Location
    Shoreview MN
    Posts
    977
    My Cars
    Had a 1991 BMW 850

    Cats

    Quote Originally Posted by gary8 View Post
    Have you considered plugged cats? Try removing the upstream O2 Sensors to see if it idles better. I chased all manner of issues with misfires reported on different cylinders on an 840 that barely ran until I let it "exhale" through the O2 holes. New cats and runs perfect now. Several injectors were bad. On any car, running too rich will overheat and destroy cat guts.
    Yes I considered this and it might be, no idea how long it was running badly before I bought. Car runs pretty good now except for idle and internmittent limp mode.

  6. #31
    Join Date
    Oct 2016
    Location
    Shoreview MN
    Posts
    977
    My Cars
    Had a 1991 BMW 850
    Swapped MAF Sensors and car ran worse. Drivers side which had been "weak" swapped to passenger. Ordered two rebuilt Cardone from Summit. We will see if they can get them.

    Throttle Bodies and Potentiometers are still suspect

  7. #32
    Join Date
    May 2007
    Location
    Tampa, FL
    Posts
    1,179
    My Cars
    '93 850Ci, '07 X5 4.8
    Quote Originally Posted by Pneill316 View Post
    Well my car just went limp Yesterday, scanner told me o2 sensors, luckily I had a spare brand new in the box (came as an extra 3 e31’s ago) and boom it’s gone! Wish they were all that easy.

    Same problem with my sensors (among others!!). Scanner pegged it right off the bat no less. Replaced them and going to roll out today and see how she runs... I'm going to check that new 850 so this should be an interesting morning...

  8. #33
    Join Date
    Oct 2016
    Location
    Shoreview MN
    Posts
    977
    My Cars
    Had a 1991 BMW 850
    Previously I could unplug the MAF Sensor and it would hesitate but continue running

    Got one new MAF, Swapped it for the one that I thought was bad, No Change
    Swapped the Bad one Back in for the other one and it ran worse
    Swapped the New one to the other side and put the "Good" one back in, No Change
    Uplugged the "Good" one and it hesitated and kept running
    Uplugged the New one and it stopped dead

    Two Bad MAF Sensors?

  9. #34
    Join Date
    Dec 2006
    Location
    Sunny Cali,
    Posts
    8,730
    My Cars
    6.5 second 69 Camaro
    Put the one you thought was bad and the new one back in.

  10. #35
    Join Date
    Oct 2016
    Location
    Shoreview MN
    Posts
    977
    My Cars
    Had a 1991 BMW 850

    Swap

    Quote Originally Posted by 8eights View Post
    Put the one you thought was bad and the new one back in.
    Swapped the Bad one Back in for the other one and it ran worse

  11. #36
    Join Date
    Dec 2006
    Location
    Sunny Cali,
    Posts
    8,730
    My Cars
    6.5 second 69 Camaro
    Are you getting fuel and spark from both banks? Both DME's good?
    Last edited by 8eights; 06-22-2019 at 09:35 PM.

  12. #37
    Join Date
    Oct 2016
    Location
    Shoreview MN
    Posts
    977
    My Cars
    Had a 1991 BMW 850

    Final Verdict on Limp Mode/Check Engine for my 850

    Replaced O2 Sensors Just Because
    Replaced Spark Plugs Old and Bad
    Replaced Spark Plug Wires Tested Two Bad
    Replaced Distributor Caps and Rotors Worn
    Replaced Coils Tested Bad, No Difference
    Cleaned Throttle Bodies Commutators were nasty
    Replaced MAF Sensors, both tested good but made no difference if you disconnected them. Replaced both and Check Engine light is out, 100 miles test drive for later today

  13. #38
    Join Date
    Jan 2005
    Location
    Japan
    Posts
    54,655
    My Cars
    11/88 E32 750iL+98 E36M3
    Problem solved with changing the MAFs?
    I remember I had a problem of similar kind, there the cause was a broken wire loom from e-box to the MAF. The outer sheath of that wire loom get's stone hard after so many year in that temperature environment and when that breaks it cuts into the single wires inside, usually in places where the loom is moved, found some broken just about 10 cm before the plug goes into the MAF. Sometimes the contact was still there, sometimes not. Found that in several M70 engines of my wrenching friends.
    Shogun tricks and tips for the E32 series are HERE!

  14. #39
    Join Date
    Oct 2016
    Location
    Shoreview MN
    Posts
    977
    My Cars
    Had a 1991 BMW 850

    Maf

    Other than the Coils everything I did had an effect on it running better.

    Had I just changed the MAF sensors to start with I would have ended up changing all of the rest anyway

  15. #40
    Join Date
    Dec 2006
    Location
    Sunny Cali,
    Posts
    8,730
    My Cars
    6.5 second 69 Camaro
    Did the Maf sensors fix your issue?

  16. #41
    Join Date
    Oct 2016
    Location
    Shoreview MN
    Posts
    977
    My Cars
    Had a 1991 BMW 850

    Maf

    Quote Originally Posted by 8eights View Post
    Did the Maf sensors fix your issue?
    Yes MAF sensors were the ultimate cause but everything else other than the coils was either bad or suspect

  17. #42
    Join Date
    Sep 2018
    Location
    Belgium
    Posts
    307
    My Cars
    1990 850i and 1970 2800C
    haha, i was right already in post #2 ..... ?

  18. #43
    Join Date
    Jan 2005
    Location
    Japan
    Posts
    54,655
    My Cars
    11/88 E32 750iL+98 E36M3
    in case you need a new plug for the MAF sensor, that is not listed under E31 and E32, PLUG HOUSING 7-POL 12521737668 , here the details https://www.bimmerforums.com/forum/s...flow-connector
    Shogun tricks and tips for the E32 series are HERE!

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