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Thread: Loss of power while driving

  1. #26
    Join Date
    Oct 2011
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    Merritt Island Florida US
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    38
    My Cars
    1993 850Ci
    I had my mechanic change my sparkplug wires, rotors and distributor caps yesterday. Later that day I started having the problems you've been discussing here. Over the weekend I'll take my car back to him with all this info and see what we find out. I'll keep you posted.
    Last edited by jetrooster; 03-10-2012 at 07:34 AM.

  2. #27
    Join Date
    Jan 2008
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    Indianapolis, IN
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    93 850Ci, 09 Caddy SRX
    Quote Originally Posted by IJustDrive View Post
    Great news!! I think I'm going to start here as well

    Anything new to report?

  3. #28
    Join Date
    Nov 2009
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    01M5,72TA,06LBz,850,540m
    I believe i saw the sensor wire on bank one but not on bank 2 @ #12. I pulled the wires totaly off and layed them at a right angle to eh engine to replace the 2 wires. I am in Stealth limp home mode as well. Car seems like it starts on 12 and then dropps off to 6 cyliders. just the drivers side is running.
    Last edited by cer54467; 03-26-2012 at 04:35 PM.

  4. #29
    Join Date
    Feb 2010
    Location
    Hampshire UK
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    99 840ci Sport Indv
    If you do not have the inductive sensor on the # 12 plug lead, the car will start on 12 cylinders and then drop to 6.
    Timm..2007 E64 650i Individual Sport..1999 E31 840ci Individual Sport..ex owner of 2000 E38 740..1999 E38 740i V8 M62..1998 E38 735i V8..1993 E32 730i V8..1988 E28 518i


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  5. #30
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    01M5,72TA,06LBz,850,540m
    yeah but it is running on that side.....!??! I have ot double check a few things and then i am going to start swapping Fuel pump relays and coils and DME's. I just remebers the inductive sensor is way up by the cap and it is on the wire.


    Induction coil/sensors both there and plugged in. I guess next easiest is check FP relay voltage? And then start swapping coil, then DME? i still have to figure out the ticking.... loose cam cradle cap?
    Last edited by cer54467; 03-26-2012 at 07:41 PM.

  6. #31
    Join Date
    Oct 2011
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    Merritt Island Florida US
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    My Cars
    1993 850Ci
    Sorry for the late update. I changed out the new 6 and 12 plug wires (the once with the sensors) with the old once I had on before. Problem gone!!!!! So I bought a faulty plug wire set (Bosh).

  7. #32
    Join Date
    Mar 2012
    Location
    Auckland, New Zealand
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    723
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    1991 BMW 850i
    Sorry to dredge up an old thread but I have recently started experiencing this exact problem. Unfortunately, I've never been able to get the diagnostic port to work (I've tried and a dozen known working systems but there's a fault somewhere that is preventing diagnostics from working properly - but that's another story) so I'm always having to identify issues the old fashioned way. I too replaced the ignition leads with aftermarket but kept the original crank sensors. They have been working fine since I replaced them (about 3 years ago) until a few weeks ago when I had, coincidentally, not driven the car for a while and forgot to unhook the batteries. Ever since recharging the batteries this issue has presented itself.

    The car starts fine, idles fine (although it has developed a slight hiccup on cold starts which goes as soon as you apply the throttle) and drives fine but it has started losing a bank (not sure which) when cruising at speed. If you button off the power and reapply the bank seems to come back online.

    Reading these posts I'd hazard a guess that either plug 6 or 12 has come loose (this after market set has had an occasional history of working loose under load weirdly) or one of the sensors is poked. Will see if I can find a good used donut and try switching them up.

  8. #33
    Join Date
    Jun 2014
    Location
    Blue Springs MO
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    708
    My Cars
    M70 6sp. 540iT, 535is
    check your plugs on 12 and 6, just remove them and visually inspect it.. if its carbonized from oil consumption, it'll be shorted, and won't send much of a spark signal to "doughnut - cam sensor".

    - - - Updated - - -

    Quote Originally Posted by jeffbebe View Post
    Sorry to dredge up an old thread but I have recently started experiencing this exact problem. Unfortunately, I've never been able to get the diagnostic port to work (I've tried and a dozen known working systems but there's a fault somewhere that is preventing diagnostics from working properly - but that's another story)
    http://www.bimmerforums.com/forum/sh...&highlight=txd
    Post #11. Hope it'll help.

  9. #34
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    Mar 2012
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    Quote Originally Posted by bmw528e11 View Post
    check your plugs on 12 and 6, just remove them and visually inspect it.. if its carbonized from oil consumption, it'll be shorted, and won't send much of a spark signal to "doughnut - cam sensor".

    - - - Updated - - -



    http://www.bimmerforums.com/forum/sh...&highlight=txd
    Post #11. Hope it'll help.
    Will certainly check the plugs but hope I don't find oil - haven't got time for valve stem seal replacements in the near future!!

    Massive thanks for the other post. I was 100% certain a faulty module was preventing diagnostics from working properly but hadn't figured out how to identify which one! Will try that out this weekend.

    That's why I love this forum!!

  10. #35
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    Mar 2012
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    1991 BMW 850i
    Plug 12 was the issue. The lead had worked it's way loose so it would run on 11 cylinders then occasionally lose a bank when the CPS wasn't getting the right info. For some reason (actually I know the reason and it's 'aftermarket') the plug socket just doesn't 'snap' on to the plug like the others, not matter how hard I push. So eventually, it works its way off. Guess I'll have to redo the wires at some point - or just check it before each drive.

    Haven't ID'd the faulty module yet so I can get the scanner going but will hopefully do so this or next weekend.

  11. #36
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    Mar 2012
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    1991 BMW 850i
    After re-securing the lead it promptly popped off again and I lost a bank. Looks like it's a crappy plug boot. Will try crimping it a little and filling it with dielectric grease to see if I can get a better contact. Otherwise it'll need replacing, though a good opportunity to refresh coils and distributor caps and rotors, which haven't been done during my ownership (which means possibly haven't been done at all!).

  12. #37
    Join Date
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    99 840ci Sport Indv
    Excellent work and thanks for updating with the fix!
    Timm..2007 E64 650i Individual Sport..1999 E31 840ci Individual Sport..ex owner of 2000 E38 740..1999 E38 740i V8 M62..1998 E38 735i V8..1993 E32 730i V8..1988 E28 518i


    My BMW Repair YouTube Channel
    My Current 840ci Sport Individual
    My Current 650ci Sport Individual
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  13. #38
    Join Date
    Mar 2012
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    1991 BMW 850i
    Cleaned up the boot and fitted properly but the problem persisted so I decided to take a look at the other end. Turns out the connection at the distributor end was much worse. A lot of oxidisation suggesting that the contact was poor. This was an aftermarket lead with a push fit 90° boot which I fitted in order to re-use the CP sensors which were in good nick. Obviously the push-fit connection wasn't working either as there was a lot of oxidisation inside the boot as well. I've tried to scrape it away with a thin file but it's not perfect. Any suggestions on how to clean this up or should I replace? Anyone know where I can get a single cyl 12 lead?

  14. #39
    Join Date
    Nov 2005
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    Langley BC Canada
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    91 850 Panzer
    What number lead?
    91 850 (Panzer), 2012 Mini Cooper Countryman (WifeMobile) www.wuffer.ca


  15. #40
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    Mar 2012
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    Quote Originally Posted by Wuffer View Post
    What number lead?
    No 12 (passenger side - RHD car - by the firewall).

  16. #41
    Join Date
    Nov 2005
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    Have one tested good but shipping to NZ takes a while!
    91 850 (Panzer), 2012 Mini Cooper Countryman (WifeMobile) www.wuffer.ca


  17. #42
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    Quote Originally Posted by Wuffer View Post
    Have one tested good but shipping to NZ takes a while!
    Not too worried about the wait, Tom! Does the lead you have include the sensor or does it have a separable boot so I can slip the old sensor on?

  18. #43
    Join Date
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    Would include sensor...
    91 850 (Panzer), 2012 Mini Cooper Countryman (WifeMobile) www.wuffer.ca


  19. #44
    Join Date
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    Quote Originally Posted by Wuffer View Post
    Would include sensor...
    Once again you are a star, Tom. I'll contact you via email to make payment, etc.

  20. #45
    Join Date
    Mar 2012
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    Auckland, New Zealand
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    1991 BMW 850i
    Looks like cyl 12 spark plug hole is also threaded. What a pain in the proverbial. Am hoping by removing the battery terminal and cabin filter cowl, I might be able to make enough room to get a rethread tool in there. Can the brake master cylinder be moved easily without bleeding the brakes?

  21. #46
    Join Date
    Nov 2010
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    Central, MO, USA
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    1993 BMW 850Ci
    To my recollection, the master cylinder (and booster) would be very difficult to reposition without a lot of disassembly work. Removing the heater auxiliary pump may gain some room (label or photograph the maze of connecting hoses. You will have to burp the cooling system after refill.) It is still going to be an adventure working on cylinder 12! Good luck.

    Mark in mid-MO
    1993 BMW 850Ci 6-speed
    2011 Cadi CTS coupe 6-speed

  22. #47
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    Mar 2012
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    Quote Originally Posted by ByMW View Post
    To my recollection, the master cylinder (and booster) would be very difficult to reposition without a lot of disassembly work. Removing the heater auxiliary pump may gain some room (label or photograph the maze of connecting hoses. You will have to burp the cooling system after refill.) It is still going to be an adventure working on cylinder 12! Good luck.
    What I thought but not what I wanted to hear. I think it's going to be a massive PITA to fix when all I wanted to do was relax over the Xmas break!!

  23. #48
    Join Date
    Dec 2013
    Location
    San Antonio
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    850,76 2002 &530,84 633
    I've had 2247 on my motronic. EDIT: I also had a mystery code 2235 a few weeks ago that wasn't on the charts.
    I just found this thread after starting another one today about this same problem with intermittent running. Has anyone figured out the 2235 code?

    BTW, I ohmed the donuts and one appeared to be bad even tho it was brand new aftermarket. I subbed the old oem wire, but i have not subbed the other oem wire for the new donut that is still on the car. Maybe this will solve the problem.

  24. #49
    Join Date
    Mar 2012
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    Quote Originally Posted by JDP530 View Post
    I just found this thread after starting another one today about this same problem with intermittent running. Has anyone figured out the 2235 code?

    BTW, I ohmed the donuts and one appeared to be bad even tho it was brand new aftermarket. I subbed the old oem wire, but i have not subbed the other oem wire for the new donut that is still on the car. Maybe this will solve the problem.
    99% of the issues I've had with my 8er can be traced back to aftermarket parts used by the previous owner. The savings are never worth it in my experience.

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